Optical anisotropy of quartz in the presence of temperature-dependent multiple reflections using a high-accuracy universal polarimeter

Optical activity and birefringence in the presence of multiple reflections for (100), (010) and (101) planes of quartz were studied by using a high-accuracy universal polarimeter (HAUP) in a temperature range between 20 and 300 °C. Likewise, optical activity in the presence of multiple reflections for the (001) plane of quartz was studied by using a conventional polarimeter in the same temperature range at 632.8 nm wavelength. In all cases a modulation of the HAUP parameters determined by linear least-square fit is observed when the temperature is changed. This effect can be explained by the multiple reflections within the slab of a high degree of plane parallelism. The Levenberg-Marquardt method of nonlinear least-square routines was used to compare the experimental values of the HAUP coefficients with the results obtained using the Jones formalism. The method gives directly the optimum temperature dependence of birefringence and gyration tensor components of quartz.