Infrared transmission of 25 liquid crystal compounds was evaluated. Based on these results, a liquid crystal mixture consisting of fluoro and dialkyl diphenyl-diacetylene homologs was developed for CO2 laser application. This mixture exhibits a wide nematic range, high birefringence, low viscoelastic coefficient, and relatively small absorption at two CO2 laser lines: 10.59 and 10.77 μm. Its figure of merit is three times higher than the E44 commercial mixture at room temperature.
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Wu et al. (1994) studied this question.