Home I People I Faculty I Prof. C. P. Girijavallabhan Publications 

 
Last modified: August. 01, 2007                                                                                               (recent publications-see below)
1. Fiber optic pH sensor with dye-doped multilayer sol-gel coatings.     Lee, Thomas S.; Jose, Gin; Manju, C. M.; Joseph, Betty; John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (2001),  4417(Photonics 2000),  546-554. 
2. Chemical sensing with microbent optical fiber.     Thomas, Lee S.; George, Nibu A.; Sureshkumar, P.; Radhakrishnan, P.; Vallabhan, C. P. G.; Nampoori, V. P. N.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Optics Letters  (2001),  26(20),  1541-1543. 
3. A sensitive fiber optic pH sensor using multiple sol-gel coatings.     Lee, S. Thomas; Gin, Jose; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.; Radhakrishnan, P.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Opt. A: Pure Appl. Opt.  (2001),  3(5),  355-359. 
4. Influence of laser irradiance and helium ambient on the expansion of laser-produced carbon plasma.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Institut fur Experimentalphysik V,  Ruhr Universitat Bochum,  Bochum,  Germany.    Proc. SPIE-Int. Soc. Opt. Eng.  (2001),  4424(Laser Interaction with Matter),  520-523. 
5. Use of an open photoacoustic cell for the thermal characterisation of liquid crystals.     George, N. A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Phys. B: Lasers Opt.  (2001),  73(2),  145-149. 
6. Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals.     George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, WA, U. S.)  (2001),  40(7),  1343-1347. 
7. Nonlinear absorption and optical limiting in solutions of some rare earth substituted phthalocyanines.   Unnikrishnan, K. P.; Thomas, Jayan; Paul, Binoy; Kurian, Achamma; Gopinath, Pramod; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Nonlinear Opt. Phys. Mater.  (2001),  10(1),  113-121. 
8. Optical absorption and emission spectral studies of phthalocyanine molecules in DMF.     Kumar, G. A.; Thomas, J.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    J. Porphyrins Phthalocyanines  (2001),  5(5),  456-459. 
9. Optical properties of phthalocyanine molecules in cyano acrylate polymer matrix.     Kumar, G. A.; Thomas, J.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Solid State Electronics Division,  International School of Photonics, Cochin University of Science and Technology,  Kochi,  India.    Mater. Res. Bull.  (2001),  36(1-2),  1-8. 
10. Photoacoustic evaluation of the thermal effusivity in the isotropic phase of certain comb-shaped polymers.  George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Journal of Physics: Condensed Matter  (2001),  13(3),  365-371. 
11. Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures.     George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (2000),  33(24),  3228-3232. 
12. Emission spectral studies of phthalocyanines in borate glass matrix.     Kumar, G. A.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Jose, G.; Unnikrishnan, N. V.    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    J. Mater. Sci. Lett.  (2000),  19(18),  1669-1672. 
13. Spectral studies of naphthalocyanine (Nc) and rare earth phthalocyanine (RePc) molecules in an inorganic glassy borate matrix.     Kumar, G. A.; Thomas, J.; George, N.; Nampoori, V. P. N.; Radhakrishnan, P.; Vallabhan, C. P. G.; Unnikrishnan, V.    Solid State Electronics Division,  International School of Photonics, Cochin University of Science and Technology,  Kochi,  India.    Phys. Chem. Glasses  (2000),  41(4),  199-203. 
14. NO2 detection with a fiber optic evanescent wave sensor.     Mechery, John Shelly; Thomas, Jayan; Unnikrishnan, K. P.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3897(Advanced Photonic Sensors and Applications),  173-178. 
15. Optical studies of phthalocyanine molecules in PVA film.     Thomas, J.; Kumar, G. A.; Unnikrishnan, N. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Solid State Electronics Division,  Cochin University of Science and Technology,  Kochi,  India.    Mater. Lett.  (2000),  44(5),  275-278. 
16. Physical and optical properties of phthalocyanine doped inorganic glasses.     Kumar, G. A.; Thomas, J.; George, N.; Unnikrishnan, N. V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    J. Mater. Sci.  (2000),  35(10),  2539-2542. 

17. Optical absorption studies of free (H2Pc) and rare earth (RePc) phthalocyanine doped borate glasses.     Kumar, G. A.; Thomas, J.; George, N.; Kumar, B. A.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Unnikrishnan, N. V.    Solid State Electronics Division, International School of Photonics,  Cochin University of Science and Technology,  Kochi,  India.    Phys. Chem. Glasses  (2000),  41(2),  89-93. 

18. Experimental investigation of optical limiting and thermal lensing in toluene solutions of C70.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Phys. B: Lasers Opt.  (2000),  70(3),  429-434. 
19. Photoacoustic investigation of the effect of excess lead oxide on thermal diffusivity of PLZT ceramic.     George, N. A.; Paul, T.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Sebastian, M. T.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Mater. Sci. Lett.  (2000),  19(6),  499-501. 
20. Thermal diffusivity of some polymer supported halogeno benzimidazole complexes of cobalt(II) and copper(II) - a photoacoustic study.     Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Saravanan, N.; Yusuff, K. K. Mohammed.    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Mater. Sci. Lett.  (1999),  18(23),  1887-1889. 
21. Solvent effect on absolute fluorescence quantum yield of rhodamine 6G determined using transient thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Mod. Phys. Lett. B  (1999),  13(16),  563-576.  
22. Evaluation of electrical conductivity and thermal diffusivity of vanadyl naphthalocyanine.     Thomas, J.; Pillai, V. N. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Mater. Sci. Lett.  (1999),  18(12),  963-964. 
23. Photoacoustic study on photobleaching of Rhodamine 6G doped in poly(methyl methacrylate).     George, Nibu A.; Aneeshkumar, B.; Radhakrishnan, P.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (1999),  32(14),  1745-1749. 
24. Optical limiting and thermal lensing studies in C60.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G. International School of Photonics, Laser Division,  Cochin University of Science and Technology,  Cochin,  India.    J. Appl. Phys.  (1999),  86(3),  1388-1392. 
25. Multiphoton absorption studies in aqueous solutions of rhodamine 6G laser dye using transient thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Bindu, V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Int. School of Photonics, Laser Div.,  Cochin Univ. of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3729(International Conference on Optics and Optoelectronics '98),  312-317. 
26. Monitoring the rate of pulsed laser deposition of silver thin films using a fiber optic sensor.     John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Proc. SPIE-Int. Soc. Opt. Eng.  (1999),  3666(Photonics India '98),  574-577. 
27. Investigation of nonlinear absorption and aggregation in aqueous solutions of rhodamine B using thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Pramana  (1999),  52(4),  435-442. 
28. Studies of nonlinear absorption and aggregation in aqueous solutions of rhodamine 6G using a transient thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (1999),  32(4),  407-411. 
29. A fiber optic evanescent wave sensor for monitoring the rate of pulsed laser deposition of metal thin films.     John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Meas. Sci. Technol.  (1999),  10(2),  n17-n20. 
30. Two and three photon absorption in rhodamine 6G methanol solutions using pulsed thermal lens technique.  Bindhu, C. V.; Harilal, S. S.; Kurian, Achamma; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Nonlinear Opt. Phys. Mater.  (1998),  7(4),  531-538. 
31. Photoacoustic study of the effect of hydroxyl ion on thermal diffusivity of g alumina.     Sankara Raman, S.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Ambadas, G.; Sugunan, S.    International School of Photonics,  Cochin University of Science and Technology,  Cochin, Kerala,  India.    J. Appl. Phys.  (1999),  85(3),  1987-1988.  
32. Photoemission optogalvanic effect: theory and applications.     Prasad, K. C. Ajith; Nampoori, V. P. N.; Sasikumar, P. R.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.  Editor(s): Roy, A. P.    Spectrosc., [Int. Conf.]  (1997),  Meeting Date 1996,     251-256.  Publisher: Narosa,  New Delhi, India 
33. Prompt electron emission and collisional ionization of ambient gas during pulsed laser ablation of silver.     Issac, R. C.; Varier, G. K.; Gopinath, P.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School Photonics,  Cochin University Science Technology,  Cochin,  India.    Appl. Phys. A: Mater. Sci. Process.  (1998),  A67(5),  557-561. 
34. Thermal diffusivity measurements in organic liquids using transient thermal lens calorimetry.     Bindhu, C. V.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics Laser Division,  Cochin University of Science and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1998),  37(10),  2791-2794. 
35. Collective behavior of laser-produced plasma from a multicomponent YBa2Cu3O7 target in air.     Issac, R. C.; Varier, G. K.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Div., International School Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Appl. Phys. B: Lasers Opt.  (1998),  B67(5),  647-651. 
36. An optical fiber based evanescent wave sensor to monitor the deposition rate of thin films.     Jose, Deepa; John, M. Shelly; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Thin Solid Films  (1998),  325(1,2),  264-267. 
37. Twin peak distribution of electron emission profile and impact ionization of ambient molecules during laser ablation of silver target.     Issac, Riju C.; Gopinath, Pramod; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Laser Division,  Cochin University of Science & Technology,  Cochin,  India.    Appl. Phys. Lett.  (1998),  73(2),  163-165. 
38. Induction of mitotic chromosomal aberrations by lasers in comparison to gamma radiations.     Pillai, P. R. Unnikrishna; Nambisan, Padma; Nampoori, V. P. N.; Vallabhan, C. P. G..    Department of Biotechnology,  Cochin University of Science and Technology,  Cochin,  India.    Yichuan  (1997),  19(5),  5-9
39. Use of mirage effect for the detection of phase transitions in liquid crystals.     Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; George, A. K.    International School of Photonics, Opto-Electronics Laboratory,  Cochin University of Science and Technology,  Cochin,  India.    Mater. Lett.  (1998),  36(1-4),  76-80. 
40. Time evolution of the electron density and temperature in laser-produced plasmas from YBa2Cu3O7.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School Photonics,  Cochin University Science Technology,  Cochin,  India.    Appl. Phys. B: Lasers Opt.  (1998),  B66(5),  633-638. 
41. Temporal and spatial behavior of electron density and temperature in a laser-produced plasma from YBa2Cu3O7.  Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School Photonics,  Cochin University Science Technology,  Cochin,  India.    Appl. Spectrosc.  (1998),  52(3),  449-455. 
42. Dynamics of laser produced silver plasma under film deposition conditions studied using optical emission spectroscopy.     Issac, Riju C.; Vasudevan Pillai, K.; Harilal, S. S.; Varier, Geetha K.; Bindhu, C. V.; Gopinath, Pramod; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Laser Division,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Surf. Sci.  (1998),  125(2),  227-235.
43. Influence of ambient gas on the temperature and density of laser produced carbon plasma.     Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Laser Division,  Cochin University of Science and Technology,  Cochin,  India.    Appl. Phys. Lett.  (1998),  72(2),  167-169.
44. Anomalous profile of a self-reversed resonance line from Ba+ in a laser produced plasma from YBa2Cu3O7.   Issac, Riju C.; Harilal, S. S.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Spectrochim. Acta, Part B  (1997),  52B(12),  1791-1799
45. Fine structure in the time of flight distribution of C2 in laser produced plasma from graphite.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Pramana  (1997),  49(3),  317-322. 
46. Spatial analysis of C2 band emission from laser produced plasma.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Plasma Sources Sci. Technol.  (1997),  6(3),  317-322. 
47. Time resolved study of CN band emission from plasma generated by laser irradiation of graphite.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Gopinath, Pramod; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Spectrochim. Acta, Part A  (1997),  53A(10),  1527-1536. 
48. Electron density and temperature measurements in a laser produced carbon plasma.     Harilal, S. S.; Bindhu, C. V.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Laser Division,  Cochin University of Science + Technology,  Cochin,  India.    J. Appl. Phys.  (1997),  82(5),  2140-2146. 
49. Possibility of waveguide formation on organic nonlinear crystal methyl para-hydroxy benzoate using high energy ion irradiation.     Sreeramana Aithal, P.; Nagaraja, H. S.; Mohan Rao, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; Avasthi, D. K. Department of Electronics, NSAM College,  Nitte-574 110,  India.    Nucl. Instrum. Methods Phys. Res., Sect. B  (1997),  129(2),  217-220. 
50. Investigations on nanosecond laser produced plasma in air from the multi-component material YBa2Cu3O7.  Varier, Geetha K.; Isaac, Riju C.; Harilal, S. S.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Div., International Sch. Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Spectrochim. Acta, Part B  (1997),  52B(5),  657-666. 
51. Optical emission studies of C2 species in laser-produced plasma from carbon.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D: Appl. Phys.  (1997),  30(12),  1703-1709. 
52. Emission characteristics and dynamics of C2 from laser-produced graphite plasma.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics,  Cochin University of Science & Technology,  Cochin,  India.    J. Appl. Phys.  (1997),  81(8, Pt. 1),  3637-3643. 
53. Photoacoustic signal saturation and optical limiting in C70-toluene solution.     Issac, Riju C.; Harilal, S. S.; Varier, Geetha K.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics, Laser Division,  Cochin University of Sciences and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1997),  36(2),  332-336. 
54. Time resolved analysis of C2 emission from laser induced graphite plasma in helium atmosphere.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Int. Sch. Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Jpn. J. Appl. Phys., Part 1  (1997),  36(1A),  134-138. 
55. A fiber optic sensor to measure surface tension.     Deepthy, A.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Indian J. Phys., B  (1996),  70B(6),  527-530. 
56. Characterization of potassium doped GdBa2Cu3O7-d using Raman spectroscopy and x-ray diffraction. [Erratum to document cited in CA124:329709].     Thomas, Preethi Cicily; Manoj, Jumar K.; Nayar, V. Unnikrishnan; Vidyalal, V.; Vallabhan, C. P. G..    Dep. Optoelectron.,  Univ. Kerala,  Trivandrum,  India.    Mod. Phys. Lett. B  (1996),  10(23),  1159. 
57. Photoemission optogalvanic studies with copper as target electrode.     Ajithprasad, K. C.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, School of Photonics, Cochin University of Science and Technology,  Cochin,  India.    Appl. Surf. Sci.  (1996),  103(4),  465-470. 
58. Pulsed photoacoustic determination of absolute fluorescent quantum yield of the laser dye rhodamine B.     Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School Photonics,  Cochin Univ. Science & Technology,  Cochin,  India.    Mod. Phys. Lett. B  (1996),  10(22),  1103-1110. 
59. Study of laser ablation in liquids using pulsed photoacoustic technique.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International Sch. Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Mod. Phys. Lett. B  (1996),  10(21),  1053-1057. 
60. Temporal and spatial evolution of C2 in laser-induced plasma from graphite target.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School Photonics,  Cochin Univ. Science & Technology,  Cochin,  India.    J. Appl. Phys.  (1996),  80(6),  3561-3565. 
61. Measurements of electromagnetic shielding effect using HTSC materials.     Vidyalal, V.; Rajasree, K.; Vallabhan, C. P. G..Opto-Electronic Lab.,  Cochin Univ. of Sci. and Technology,  Cochin,  India.    Mod. Phys. Lett. B  (1996),  10(7),  293-297. 

62. Electron density determination of laser induced plasma from polymethyl methacrylate using phaseshift detection techniques.     Varier, Geetha K.; Harilal, S. S.; Bindhu, C. V.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Div.,  Internat. Sch. Technol.,  Cochin,  India.    Mod. Phys. Lett. B  (1996),  10(6),  235-239.

63. A study of photoacoustic effects and optical limiting in the solution of C60 in toluene.     Issac, Riju C.; Bindhu, C. V.; Harilal, S. S.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Div.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Mod. Phys. Lett. B  (1996),  10(1 & 2),  61-67. 
64. Photoacoustic studies on multilayer dielectric coatings.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1996),  29(5),  1387-1388. 
65. Spatial and time resolved analysis of CN bands in the laser induced plasma from graphite.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School of Photonics,  Cochin University of Science and Technology,  Cochin,  India.    Pramana  (1996),  46(2),  145-151. 

66. Characterization of potassium-doped GdBa2Cu3O7-d using Raman spectroscopy and x-ray diffraction.     Thomas, Preethi Cicily; Manoj, Kumar K.; Nayar, V. Unnikrishnan; Vidyalal, V.; Vallabhan, C. P. G..    Dep. Optoelectron.,  Univ. Kerala,  Trivandrum,  India.    Mod. Phys. Lett. B  (1995),  9(26 & 27),  1739-52.

67. Measurement of the absolute fluorescence quantum yield of rhodamine B solution using a dual-beam thermal lens technique.     Bindhu, C. V.; Harilal, S. S.; Varier, Geetha K.; Issac, Riju C.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International Sch. Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1996),  29(4),  1074-9. 
68. Measurement of thermal diffusivity of some halogeno benzimidazole complexes of cobalt(II), copper(II) and copper(I) using laser induced photoacoustic effect.     Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Saravanan, N.; Yusuff, K. K. Mohammed.    International Sch. of Photonics and Dep. of Applied Chemistry,  Cochin Univ. of Science and Technology,  Kerala,  India.    J. Mater. Sci. Lett.  (1996),  15(3),  230-1. 
69. Electrical conductivity and thermal diffusivity of zinc naphthalocyanine.     Thomas, J.; Pillai, V. N. Sivasankara; Xavier, E.; Vallabhan, C. P. G..    Sch. Photonics,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Mater. Sci. Lett.  (1996),  15(2),  151-2. 
70. Evanescent wave sensor to monitor the etching rate of an optical fiber.     Lovely, M. R.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School Photonics,  Cochin University Science & Technology,  Cochin,  India.    Indian J. Pure Appl. Phys.  (1996),  34(1),  34-5. 
71. Laser induced thermal lens effect in rhodamine B - signature of resonant two photon absorption.     Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    International School Photonics,  Cochin University Science Technology,  Cochin,  India.    Mod. Phys. Lett. B  (1995),  9(22),  1471-7. 
72. Photoacoustic study of the effect of degassing temperature on thermal diffusivity of hydroxyl loaded alumina.   Raman, S. Sankara; Nampoori, V. P. N.; Vallabhan, C. P. G.; Ambadas, G.; Sugunan, S.    International School of Photonics,  Cochin University of Science and Technology,  Kerala,  India.    Appl. Phys. Lett.  (1995),  67(20),  2939-41
73. CW-Ar+ laser induced structural and optical properties of amorphous Sb2Se3 films.     Jayakumar, S.; Balasubramanian, C.; Narayandass, Sa. K.; Mangalaraj, D.; Vallabhan, C. P. Girija.    Department Physics,  PSG College Technology,  Coimbatore,  India.    Mater. Res. Bull.  (1995),  30(9),  1141-51. 

74. Subcritical Hopf bifurcation in Ne-Nd hollow cathode discharge (Physics Letters A 196 (1994) 191).     Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Phys. Lett. A  (1995),  199(5,6),  416.

75. Observation of multiphoton process in liquid CS2 using pulsed photoacoustic technique.     Harilal, S. S.; Issac, Riju C.; Bindhu, C. V.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    School Photonics,  Cochin University Science Technology,  Cochin,  India.    Mod. Phys. Lett. B  (1995),  9(14),  871-6. 
76. Photoemission optogalvanic effect near the instability region of a hollow cathode discharge.     Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, International School of Photonics, Cochin University of Science and Technology,  Cochin,  India.    Opt. Commun.  (1995),  118(5,6),  525-8. 
77. Pulsed photoacoustic technique to study nonlinear processes in liquids: results in toluene.     Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Sch. of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Pramana  (1995),  44(3),  231-5. 
78. Anomalous variation of thermal lens signal with concentration from Rhodamine B in methanol solution.     Bindhu, C. V.; Harilal, S. S.; Issac, Riju C.; Varier, Geetha K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Sch. of Photonics,  Cochin Univ. of Science and Technology,  Cochin,  India.    Pramana  (1995),  44(3),  225-9. 
79. Subcritical Hopf bifurcation in Ne-Nd hollow cathode discharge. [Erratum to document cited in CA122:120652].  Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, Department of Physics,  Cochin University of Science and Technology,  Cochin,  India.    Phys. Lett. A  (1995),  199(5,6),  416. 
80. Application of laser beam deflection technique to study the diffusion process in electrolyte solutions.     Kurian, Achamma; Bindhu, C V; Harilal, S S; Issac, Riju C; Nampoori, V P N; Vallabhan, C P G.    Department Physics,  Catholicate College,  Pathanamthitta,  India.    Pramana  (1994),  43(5),  401-6. 
81. Detection of phase transitions in liquid crystals using the mirage effect.     Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G.; george, A. K.    Phys. Dep.,  Cochin Univ. Sci. Technol.,  Kerala,  India.    Liq. Cryst.  (1995),  18(1),  167-9. 
82. Observation of two-photon-induced photoemission optogalvanic effect using copper target electrode.     Ajithprasad, K. C.; Sasikumar, P. R.; Harilal, S. S.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. and Technol.,  Cochin,  India.    Mod. Phys. Lett. B  (1994),  8(30),  1917-22. 
83. Subcritical Hopf bifurcation in neon-neodymium hollow cathode discharge.     Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Laser Division, Department of Physics, Cochin University of Science and Technology,  Cochin,  India.    Phys. Lett. A  (1994),  196(3,4),  191-4. 
84. The photoemission optogalvanic effect in a Ne-Nd hollow cathode.     Sasi Kumar, P. R.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. of Physics,  Cochin Univ. of Sciences and Technology,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1994),  27(12),  2526-30. 
85. Photoacoustic observation of excited singlet state absorption in the laser dye rhodamine 6G.     Sathy, P.; Philip, Reiji; Nampoori, V. P. N.; Vallabhan, C. P. G..    Department Physics,  Cochin University Science Technology,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1994),  27(10),  2019-22. 
86. Monitoring the photobleaching of cresyl violet in polyvinyl alcohol using the photoacoustic effect.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Physics Department,  Cochin University Science and Technology,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1994),  33(6),  1962-3. 
87. Characterization of transparent conducting cadmium oxide films deposited by spray pyrolysis.     Gurumurugan, K.; Mangalaraj, D.; Narayandass, Sa K.; Sekar, K.; Vallabhan, C. P. Girija.    Thin Film Laboratory,  Department of Physics,  Coimbatore,  India.    Semicond. Sci. Technol.  (1994),  9(10),  1827-32. 
88. High resolution optogalvanic spectrum of N2-rotational structure of (11, 7) band in the first positive system.    Kumar, P R Sasi; Harilal, S S; Nampoori, V P N; Vallabhan, C P G.    Depa. Phys.,  Cochin Univ. Sci. Technolo.,  Cochin,  India.    Pramana  (1994),  42(3),  231-7. 
89. Modification of spectral characteristics and optogalvanic response in neon hollow cathode under laser excitation.  Kumar, P R Sasi; Nampoori, V P N; Vallabhan, C P G.    Laser Division, Department Physics,  Cochin University Science and Technology,  Cochin,  India.    Pramana  (1994),  42(5),  427-33. 
90. Thin film electroluminescent devices.     Vallabhan, C. P. G.; Jayaraj, M. K.    Dep. Phys.,  Cochin Univ. Sci. and Technol.,  Cochin,  India.  Editor(s): Rao, R. P.    Lumin.:  Phenom., Mater., Devices, [CECRI Res. Conf.], 3rd  (1992),  Meeting Date 1990,     389-97.  Publisher: Nova Sci. Publ.,  Commack, N. Y 
91. Temporal and spatial evolution of laser ablated plasma from YBa2Cu3O7.     Harilal, S. S.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Appl. Phys. Lett.  (1994),  64(25),  3377-9.  CODEN: APPLAB  ISSN: 0003-6951.  Journal  written in English.    CAN 121:120588    AN 1994:520588    CAPLUS   (Copyright 2001 ACS) 
92. Electrical and magnetic measurements in potassium-doped gadolinium barium copper oxide (GdBa2Cu3O7-d) high-temperature superconductors.     Vidyalal, V.; Rajasree, K.; Vallabhan, C. P. G.; Thomas, Preethi Cicily; Nayar, V. Unnikrishnan.    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Int. J. Mod. Phys. B  (1993),  7(18),  3273-9. 
93. Fiber optic sensor based on evanescent wave absorption.     Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Opt. Eng. (Bellingham, Wash.)  (1993),  032(04),  692-4. 
94. An inexpensive precision constant current source of resistivity measurements in high temperature superconductors.  Vidyalal, V.; Vallabhan, C. P. G..    Sci. Instrum. Cent.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Int. J. Electron.  (1993),  75(2),  341-4. 
95. Measurement of laser ablation threshold on doped bismuth strontium calcium copper oxide high-temperature superconductors by the pulsed photothermal deflection technique.     Rajasree, K.; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Appl. Phys.  (1993),  74(3),  2004-7. 
96. Determination of the laser-induced damage threshold of bulk polymer samples at 1.06 mm using the pulsed photothermal deflection technique.     Rajasree, K.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Meas. Sci. Technol.  (1993),  4(5),  591-5. 
97. Pulsed photoacoustic technique for the measurement of laser damage threshold in bulk polymers.     Kumar, A. V. R.; Padmaja, G.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Kochi,  India.    Springer Ser. Opt. Sci.  (1992),  69(Photoacoust. Phototherm. Phenom. III),  489-91. 
98. Photoacoustic studies on multilayer dielectric coatings.     Philip, Annieta; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Phys. Dep.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1993),  26(5),  836-8. 
99. High-resolution, optogalvanic study in nitrogen discharge.     Kumar, P. R. Sasi; Ambadi, B.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1993),  40(2),  113-18. 
100. Photoemission optogalvanic effect studies in nitrogen, nitrogen dioxide, and argon discharges under pulsed laser excitation.     Kumar, P. R. Sasi; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1993),  26(1),  1-3. 
101. Influence of synthesizing routes on resistivity and aging characteristics of bismuth cuprate superconductors. Vidyalal, V.; Rajasree, K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Mod. Phys. Lett. B  (1992),  6(24),  1535-40. 
102. Spatial and temporal analysis of laser-induced plasma from a polymer sample.     Padmaja, G.; Kumar, A. V. Ravi; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1993),  26(1),  35-41. 
103. Damage threshold determination of bulk polymer samples using pulsed photothermal deflection technique.  Rajasree, K.; Ravikumar, A. V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Mater. Sci.  (1992),  15(2),  183-8. 
104. Effect of a fluorescing impurity on the characteristics of stimulated Raman scattering from acetone.     Sathy, P.; Philip, Reji; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1992),  38(6),  673-9. 
105. Electrical conductivity, dielectric properties and phase transition in ethylenediammonium sulfate single crystals.  Santhakumari, N. C.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. Chem. Solids  (1992),  53(5),  697-701. 
106. Evaluation of laser ablation threshold in polymer samples using pulsed photoacoustic technique.     Kumar, A. V. Ravi; Padmaja, G.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1991),  37(4),  345-51. 
107. Characteristics of two-photon absorption in methanol solutions of Rhodamine 6G using laser-induced pulsed photoacoustics.     Philip, Reji; Sathy, P.; Nampoori, V. P. N.; Philip, Jacob; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. B:  At., Mol. Opt. Phys.  (1992),  25(1),  155-61. 
108. Characteristics of laser-induced plasma from high-Tc superconductor.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Mater. Sci.  (1991),  14(3),  545-9
109. A low-inductance, long-life, triggered spark gap switch for Blumlein-driven lasers.     Baby, Thomas; Ramachandran, T.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. and Technol.,  Cochin,  India.    Meas. Sci. Technol.  (1991),  2(9),  873-5. 
110. High power nitrogen laser with a modified gas flow system and discharge geometry.     Baby, Thomas; Ramachandran, T.; Sathianandan, K.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Rev. Sci. Instrum.  (1991),  62(9),  2076-9. 
111. Observation of two-photon induced photoemission optogalvanic effect.     Kumar, P. R. Sasi; Padmaja, G.; Kumar, A. V. Ravi; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1991),  36(4),  423-7. 
112. Effects of insulating layer on the performance of thin film electroluminescent devices.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Mater. Sci.  (1991),  14(1),  49-55. 
113. A.C. thin film electroluminescent devices with rare earth doped zinc sulfide.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Electrochem. Soc.  (1991),  138(5),  1512-16. 
114. Dielectric properties of electron-beam-evaporated samarium oxide films.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Thin Solid Films  (1991),  197(1-2),  15-19. 
115. Electrical properties and phase transitions in ethylenediammonium dinitrate.     Santhakumari, N. C.; Vallabhan, C. P. G..Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Solid State Ionics  (1991),  45(3-4),  329-34
116. Low-voltage driven zinc sulfide:manganese MIS and MISIM thin-film electroluminescent devices with europium oxide (Eu2O3) insulator layer.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1990),  23(12),  1706-10. 
117. Fluorescence quantum yield of Rhodamine 6G using pulsed photoacoustic technique.     Sathy, P.; Philip, Reji; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1990),  34(6),  585-90. 
118. Observation of two-photon absorption in Rhodamine 6G using photoacoustic technique.     Sathy, P.; Philip, Reji; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Opt. Commun.  (1990),  74(5),  313-17. 
119. Dielectric and optical properties of europium oxide films.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Thin Solid Films  (1989),  177  59-67. 
120. Photoacoustic detection of two photon absorption in formaldehyde using pulsed dye laser.     Kumar, A. V. Ravi; Padmaja, G.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1989),  33(5),  L621-L626. 
121. The a.c. conductivity in europium oxide thin films.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. PHys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Phys. Status Solidi A  (1989),  115(1),  K63-K65. 
122. Low voltage driven white light emitting thin film electroluminescent device.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. and Technol.,  Cochin,  India.    Phys. Status Solidi A  (1989),  114(2),  K233-K236. 
123. Observation of energy transfer from copper and silver centers to rare earth ions in copper-, silver-, and rare earth-doped zinc sulfide (ZnS:(Cu/Ag), RE) electroluminescent phosphors.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Indian J. Phys., A  (1989),  63A(5),  480-6. 
124. Spectral features of laser induced plasma from yttrium barium copper oxide (YBa2Cu3O7) and gadolinium barium copper oxide (GdBa2Cu3O7) high Tc superconductors.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Pramana  (1989),  32(5),  L693-L698. 
125. Time evolution of neodymium:YAG laser-induced plasma from gadolinium barium copper oxide (GdBa2Cu3O7) high-Tc superconductor.     Padmaja, G.; Kumar, A. V. Ravi; Vidyalal, V.; Radhakrishnan, P.; Nampoori, V. P. N.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1989),  22(10),  1558-61. 
126. Electrical conductivity, dielectric constant and phase transitions in pure and doped diammonium hydrogen phosphate.     Kumar, R. Navil; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys.:  Condens. Matter  (1989),  1(35),  6095-103. 
127. A study of the white electroluminescence in copper, praseodymium, chlorine-doped zinc sulfide phosphors.  Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Phys. D:  Appl. Phys.  (1989),  22(9),  1380-3. 
128. Effect of deuteration on the electrical conductivity, dielectric constant, and phase transition in triammonium hydrogen disulfate.     Kumar, Navil; Vallabhan, C. P. G..    Cochin Univ. Sci. Technol.,  Cochin,  India.    Phys. Status Solidi A  (1989),  112(2),  K113-K117. 
129. Ionic thermocurrent study of lead(2+)-doped sodium chlorate crystals.     Kumar, R. Navil; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    J. Mater. Sci. Lett.  (1989),  8(4),  453-5. 
130. The a.c. electroluminescent thin film devices with dysprosium- and chlorine-activated zinc sulfide and praseodymium- and chlorine-activated zinc sulfide phosphors.     Jayaraj, M. K.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ. Sci. Technol.,  Cochin,  India.    Bull. Electrochem.  (1989),  5(4),  284-7. 
131. A study on the electroluminescence spectrum of samarium- and dysprosium-doped calcium sulfide.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Phys. Status Solidi B  (1986),  134(1),  383-90. 
132. Preparation of a highly efficient cerium-activated calcium sulfide electroluminescent phosphor and its emission characteristics.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Bull. Electrochem.  (1985),  1(5),  503-5. 

133. Laser-induced damage study of polyacrylonitrile films.     Radhakrishnan, P.; Sathianandan, K.; Vallabhan, C. P. G..    Cochin Coll.,  Cochin,  India.    Bull. Electrochem.  (1985),  1(3),  319-20. 

134. Electroluminescence and nitrogen laser excited fluorescence of high field electroformed castor oil and liquid paraffin.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Pramana  (1985),  24(4),  601-10. 
135. Effect of deuteration on the newly found high-temperature phase transition in ADP.     Subhadra, V. K.; Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1984),  Volume Date 1982,  25C  61-2. 
136. Spectral characteristics of electroluminescence in copper-, samarium- and chlorine-activated zinc sulfide and copper-, dysprosium- and chlorine-activated zinc sulfide phosphors.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1984),  Volume Date 1982,  25C  422-3. 
137. Observation of protonic thermo-current.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1984),  Volume Date 1982,  25C  359-61. 
138. A study of the electroluminescence spectrum of erbium-doped calcium sulfide phosphor and the energy level splitting in erbium(3+) ions.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    J. Phys. C  (1984),  17(11),  2019-25. 
139. Anomalous behavior of electrical conductivity and thermally stimulated current in the paraelectric phase of ammonium sulfate single crystals.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ.,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1983),  Volume Date 1980,  23(C),  274-6
140. Phase modulation of microwave signals using point contact germanium signal diodes.     Mohanan, P.; Vallabhan, C. P. G.; Aanandan, C. K.; Nair, K. G.    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Indian J. Radio Space Phys.  (1984), 13(1),  32-3. 
141. Effect of chlorine concentration on the spectral characteristics of electroluminescence in copper- and chlorine-doped zinc sulfide phosphor.     Pillai, S. M.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Solid State Commun.  (1983),  47(11),  909-11. 
142. High-temperature phase transitions in pure and deuterated ammonium dihydrogen phosphate:  conductivity and dielectric measurements.     Subhadra, V. K.; Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    J. Appl. Phys.  (1983),  54(5),  2593-6. 
143. Ionic thermocurrent studies in lithium ammonium sulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Phys. Rev. B:  Condens. Matter  (1982),  26(10),  5941-9. 
144. Protonic conduction in lithium ammonium sulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1982),  Volume Date 1981,  24 C  593-4. 
145. Phase transitions in deuterated lithium ammonium sulfate (LiND4SO4).     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Proc. Nucl. Phys. Solid State Phys. Symp.  (1982),  Volume Date 1981,  24 C  337-8. 
146. Effect of deuteration on the electrical conductivity, dielectric constant and phase transitions in lithium ammonium sulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Phys. Lett. A  (1982),  89A(1),  37-40. 
147. Low-temperature electrical conductivity, dielectric constant, and phase transitions in ammonium sulfate and ammonium-d4 sulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    Solid State Commun.  (1982),  41(2),  169-72. 
148. Observation of a high-temperature phase transition in ammonium sulfate from dielectric studies.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Univ. Cochin,  Cochin,  India.    J. Phys. C  (1981),  14(29),  L865-L868. 
149. DC electrical conductivity and phase transitions in triammonium hydrogen disulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ.,  Cochin,  India.    J. Phys. C  (1981),  14(20),  L571-L574. 
150. Detection of ferroelectric phase transitions in lithium ammonium sulfate by electrical conductivity studies.  Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ.,  Cochin,  India.    Natl. Acad. Sci. Lett. (India)  (1980),  3(12),  364-6. 
151. Electrical conductivity and thermally stimulated current in the paraelectric phase of ammonium sulfate.  Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ.,  Cochin,  India.    Solid State Commun.  (1981),  38(6),  555-9. 
152. D.C. electrical conductivity in lithium ammonium sulfate.     Syamaprasad, U.; Vallabhan, C. P. G..    Dep. Phys.,  Cochin Univ.,  Cochin,  India.    Solid State Commun.  (1980),  34(11),  899-403. 

Recent Publications ( From Dec. 2001 )

153. Laser induced photoacoustic technique for the detection of phase transitions in liquid crystals.   George, Nibu A.; Vallabhan, C. P. G.; Nampoori, V. P. N.; George, A. K.; Radhakrishnan, P. Nondestructive Testing and Evaluation (2001), 17(6), 315-324.  
154. Thermal characterization of doped InP using photoacoustic technique.  George, Sajan D.; Kurian, Achamma; Lase, Martin; Nampoori, V. P. N.; Vallabhan, C. P. G.  Proceedings of SPIE-The International Society for Optical Engineering (2001), 4595(Photonic Systems and Applications), 183-191. 
155. Photoacoustic studies on n-type InP.   Nibu A. George, C. P. G. Vallabhan, V. P. N. Nampoori, and P. Radhakrishnan, Optical Engineering ,(2002) ,41(1), 251-254.
156. Third order nonlinear optical studies in europium naphthalocyanine using degenerate four wave mixing and Z-scan  K. P. Unnikrishnan, Jayan Thomas, V. P. N. Nampoori and C. P. G. Vallabhan,  Optics Communications, 204, (2002), 385-390. Abstract   Full text
157. A microbent fiber optic pH sensor.  S. Thomas Lee, B. Aneeshkumar, P. Radhakrishnan, C. P. G. Vallabhan and V. P. N. Nampoori,   Optics Communications. Abstract   Full text
158. Microbent Optical Fibers as Evanescent Wave Sensors .  S Thomas Lee, K. Geetha, V P N Nampoori, C P G Vallabhan and P Radhakrishnan  Optical Engg.
159. A Fiber optic evanescent wave sensor used for the detection of trace nitrites in water.  P Sureshkumar, C P G Vallabhan, V P N Nampoori, V N Sivasankara Pillai and P Radhakrishnan, Journal of Optics A.  Abstract   Full text 
160. Degenerate four wave mixing in sume metal phthalocyanines and naphthalocyanines. K. P. Unnikrishnan, Jayan Thomas, V. P. N. Nampoori and C. P. G. Vallabhan, Chem. Phys., 279, 2002, 209-213. Abstract   Full text
161. Photothermal deflection studies on GaAs epitaxial layers.  George N A, Vallabhan C P G, Nampoori V P N and Radhakrishnan P, Applied Optics 
162. Photoacoustic Investigation of doped InP using open cell configuration.  Sajan.D. George. C.P.G.Vallabhan, M.Heck, P.Radhakrishnan and V.P.N.Nampoori, Nondestructive Evaluation and Testing  
163. Thermal lens spectrum of organic dyes using optical parametric oscillator  Achamma kurian, K. P. Unnikrishnan, D. Sajan george, Pramod Gopinath, V.P.N Nampoori and C. P. G. Vallabhan,  Spectrochimica Acta part A (2003), 59, 487-491  Abstract   Full text
164. Effect of pH on quantum yield of fluorescein using thermal lens technique. Achamma Kurian, Nibu A George, Sajan D George, K P Unnikrishnan, Binoy Paul, Pramod Gopinath, V P N Nampoori and C P G Vallabhan, Journal of Optics, (2002), 31(1), 29-36. 
165. Design and development of an LED based fiber optic evanescent wave sensor for simultaneous detection of chromium and nitrite traces in water. P. Suresh Kumar, S. Thomas Lee, C.P.G.Vallabhan, V.P.N. Nampoori and P. Radhakrishnan, Optics Communications, (2002), 214 (1-6), 25-30
166. A photoacoustic study of the effect of doping concentration in the transport properties of GaAs epitaxial layers. Sajan D George, Dilna. S, Prasanth. R, P. Radhakrishnan, C. P. G. Vallabhan and V. P. N. Nampoori, Optical Engineering, (2003), 42 (5), 1476-1480
167. Realization of optical logic gates using thermal lens technique. Achamma Kurian, Nibu A George, S. Thomas Lee, K P Unnikrishnan, V P N Nampoori and C P G Vallabhan, Laser Chemistry (2002), 20 (2-4), 81-87
168. Studies on fluorescence efficiency and photodegeneration of rhodamine 6G doped PMMA using thermal lens technique. Achamma Kurian, Nibu A George, Binoy Paul, V P N Nampoori and C P G Vallabhan, Laser Chemistry (2002), 20 (2-4), 99-110 
169. Studies on two photon absorption of aniline using thermal lens effect. Achamma Kurian, K P Unnikrishnan, Thomas Lee Sajan D George,V P N Nampoori and C P G Vallabhan, J. of Nonlinear Optical Physics & Materials ( In Press)
170. Photothermal deflection measurement on heat transport in GaAs epitaxial layers.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan , Physical Review B (2003), 68 (16), 165319
171. Photothermal deflection studies on heat transport in intrinsic and extrinisic InP.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan Applied Physics B: Lasers and Optics (2003), 77, 633-637
172. Effect of Te doping on the thermal diffusivity of Bi2Se3 crystals – A study using open cell photoacoustic technique.  Sajan D George, Saji Augustine, Elizabeth Mathai, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,  Physica Status Solidi (a), (2003), 196(2), 384-389.
173. A photoacoustic study of the effect of doping concentration in the transport properties of GaAs epitaxial layers.  Sajan D George, Dilna S, Prasanth R, P Radhakrishnan, C P G Vallabhan and V P N Nampoori,  Optical Engineering, (2003) 42 (5), 1476-1480
174. Thermal characterisation of intrinsic and extrinsic InP.  Sajan D George, P Radhakrishnan, V P N Nampoori and C P G Vallabhan,  Journal of Physics D:Applied Physics, (2003), 36 (8),  990-993.
175. Photoacoustic measurement of transport properties in doped GaAs epitaxial layers. Sajan D George, Dilna S, P Radhakrishnan, C P G Vallabhan and V P N Nampoori, Physica Status Solidi (A), (2003), 195 No-2, 416-421 Abstract   Full text
176. Optical-limiting response of rare-earth metallo-phthalocyanine doped copolymer matrix.  B. Aneeshkumar, Pramod Gopinath, Jayan Thomas, C. P. G. Vallabhan, V. P. N. Nampoori, and P. Radhakrishnan,  Journal of Optical Society of America B (2003), 20, 1486-1490
177. Long Period Gratings in Multimode Fibers: Application in Chemical Sensing.  S Thomas Lee, P Suresh Kumar, R Dinesh Kumar, V P N Nampoori, C P G Vallabhan and P Radhakrishnan,  Optics Communications ( In Press)
178. Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water.  S. Thomas Lee, P. Suresh Kumar, K. P. Unnikrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, S. Sugunan and P. Radhakrishnan,  Measurement Science and
Technology (2003), 14, 858-861 Abstract  
Full text
179. Thermal lens spectrum of organic dyes using optical parametric oscillator  Achamma kurian, K. P. Unnikrishnan, D. Sajan George, Pramod Gopinath, V.P.N Nampoori and C. P. G. Vallabhan,  Spectrochimica Acta part A (2003), 59, 487-491  Abstract   Full text
180. Loss characterization in Rhodamine 6G doped polymer film waveguide by side illumination fluorescence, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, J. Opt. A: Pure Appl. Opt. 6, (2004),379–383
181. Nanosecond optical limiting response of sandwich-type neodymium dyphthalocyanine in a co-polymer host, B Aneeshkumar, Pramod Gopinath, Jayan Thomas, C P G Vallabhan, V P N Nampoori and P Radhakrishnan, Synthetic Metals, 143, (2004), 197.
182. Photoacoustic investigations on intrinsic and extrinsic InP, Sajan D George, B Aneeshkumar, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, Optical Engineering, 43 (12), (2004), 3114.
183. Photoacoustic investigations on intrinsic and extrinsic Si,  Sajan D George, B Aneeshkumar, P Radhakrishnan, V P N Nampoori and C P G Vallabhan, Optical Engineering (2004),   ( in press).
184. Study on the determination of molecular distance in organic dye mixtures using dual beam thermal lens, Achamma Kurian, Sajan D George, V P N Nampoori, C P G Vallabhan, Spectrochimica Acta part A, 61, (2005), 2799.   
185. Laser emission from transversely pumped dye-doped free standing polymer film, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, Journal of  optics A: Pure and Applied optics, 8, (2006) 189-193.
186. Propagation characteristics and wavelength tuning of amplified spontaneous emission from dye-doped polymer, K Geetha, M Rajesh, V P N Nampoori, C P G Vallabhan and P Radhakrishnan, Applied Optics, Vol.45, No.4, 1 Feb 2006.
187. A fiber optic smart sensor for studying the setting characteristics of various grades of cement, M Rajesh, K Geetha, M Sheeba, P Radhakrishnan , C P G Vallabhan and V P N Nampoori, Optics and Lasers in Engineering, Volume 44, Issue 5, May 2006, Pages 486-493.
188. Characterization of  Rhodamine 6G doped polymer optical fiber by side illumination fluorescence, M Rajesh, K Geetha, M Sheeba, , C P G Vallabhan, P Radhakrishnan and V P N Nampoori, Optical Engineering, 45(7) 075003, July 2006.
189. Design and fabrication of dye-doped polymer optical fiber for optical amplification, M Rajesh, M Sheeba, K Geetha, C P G  Vallabhan, P Radhakrishnan and V P N Nampoori, SPIE Proceedings: Symposium on Optics & Photonics, August 2006, San Diego, California USA.
190. Fabrication and characterization of dye doped optical fiber as a light amplifier, Mandanparambil Rajesh, Mavila Sheeba, Karinjamanna Geetha, Chakkalakkal P. G. Vallabhan, Padmanabhan Radhakrishnan, and Vadakkedathu P. N. Nampoori, Applied Optics, Vol. 46, No.1, 1 January 2007.
191. Light amplification in dye doped polymer films, Ritty J.Nedumpara, Geetha K, Dann V. J, V P N Nampoori,  C.P.G.Vallabhan and P Radhakrishnan, J. of Opt.A:Pure and Appl.Opt.9 (2007) 7-14.
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