The thermal effect of the refractive index for thallous halide crystals is studied. The result shows that the contribution of the variation of band width due to the change of lattice constant is important for the temperature coefficient of thallous halide crystals and is negative. The temperature coefficients of TlCl, TlBr, KRS-5 and KRS-6 have been calculated. They are in agreement with the experimental results.
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朱卡的 卢波.卤化铊晶体折射率温度系数的理论研究[J].红外与毫米波学报,1991,10(4):299~304]. ZHU KADI, LU BO, ZHU SHIYAO, FANG JUNXIN. THE THEORY OF TEMPERATURE COEFFICIENT OF THE REFRACTIVE INDEX FOR THALLOUS HALIDE CRYSTALS[J]. J. Infrared Millim. Waves,1991,10(4):299~304.]