16 June 2003 Characterization of FLCs using lasers
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A low power beam of He-Ne laser light is scattered from the sample of liquid crystal at various temperatures and is made incident on a fixed cavity Fabry-Perot etalon. Analysis of the change in the diameter of the Fabry Perot rings is indicative of the change in the mesophase of the LC. This spectroscopic technique of FPSS has enabled us to determine the mesophase transition temperatures of a wide range of liquid crystals. The technique has now been applied successfully to detect the phase transition temperatures of the biphenyl-based ferroelectric liquid crystals. These findings have been corroborated by the analysis of the thermal runs of the same samples using differential scanning calorimetery. A comparison of the observations and the results obtained by the two techniques is presented. This study clearly indicates the success of the Fabry-Perot technique in determining the PTTs. The FTIR analysis of the same samples is also presented here.
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Sureshchandra J. Gupta, Sureshchandra J. Gupta, Rita Amar Gharde, Rita Amar Gharde, "Characterization of FLCs using lasers", Proc. SPIE 4970, Laser Crystals, Glasses, and Nonlinear Materials Growth and Characterization, (16 June 2003); doi: 10.1117/12.479164; https://doi.org/10.1117/12.479164

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