Laser Fabry-Perot technique for characterization of liquid crystals

Sureshchandra J. Gupta; Rita Amar Gharde; Anand Tripathi

doi:10.1117/12.479012

16 June 2003 Laser Fabry-Perot technique for characterization of liquid crystals

Sureshchandra J. Gupta, Rita Amar Gharde, Anand Tripathi

Proceedings Volume 4970, Laser Crystals, Glasses, and Nonlinear Materials Growth and Characterization; (2003) https://doi.org/10.1117/12.479012
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States

Abstract

Spectroscopic techniques have been the most sensitive ones to register data with an unparalleled accuracy. The technique of Fabry-Perot Scattering Studies using a FP etalon coupled with a He-Ne laser and a spectrometer is used for characterization of thermotropic liquid crystals. Mesophase transition temperatures have been determined for a wide range of liquid crystals[LCs] which includes nematic, smectic, cholesteric as well as ferroelectric and antiferroelectric LCs. New mesophase transitions have also been detected and classified in addition to those reported by earlier workers. These findings have been corroborated for the same samples using Differential scanning calorimetery [DSC]. A comparison of the observations and the results obtained by FPSS and those obtained by DSC clearly indicates the success of the Fabry-Perot technique in determining the transition temperatures. It is also a clear pointer to the superior sensitivity of the FPSS method. The importance of the FPSS technique lies in its ability to determine with ease the transition temperatures more accurately and with a better sensitivity because it enables us to register even those mesophase transitions which require very small heats of transitions endothermic /exothermic) for their occurrence. The mesophase transitions involving such small heats of transitions tend to be missed out in DSC. This paper gives a complete review of the samples investigated to date using this technique.

Citation Download Citation

Sureshchandra J. Gupta, Rita Amar Gharde, and Anand Tripathi "Laser Fabry-Perot technique for characterization of liquid crystals", Proc. SPIE 4970, Laser Crystals, Glasses, and Nonlinear Materials Growth and Characterization, (16 June 2003); https://doi.org/10.1117/12.479012

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