Hg_2Cl_2 crystals for efficeitn birefringence etalon filters

摘要

We have experimentally demosnrated the physicla vapor transport growth of 30 mm diameter and 8 cm long mercurous chloride crystals for birefrignence etalon filters. The <1 1 0> oriented seeded crystals were grown in a two zone vertical transparent furnace by vapor phase transport method. Two 5 mm and 1.5 mm thick filters were fabricated and tested interferometrically and with a spectrometer. Teh filter exhibited the spectral modulation expected based on the filter thickness. The effect of temepruatre on filter performance was stuided by measuring the filter operation at specific calibrated emeprautres. We observed a signficant shift in filter wavelength at 25.8 deg C and 29.8 deg C.