晶体光轴的不平行对Glan-Thompson棱镜性能影响分析

Effect of misalignment of the crystal optical axis on the performance of a Glan-Thompson prisms

为了分析Glan-Thompson棱镜两部分光轴不平行对棱镜性能的影响,利用冰洲石晶体的双折射特性,得到了两类晶体光轴不平行时Glan-Thompson棱镜出射光束偏离角、消光比和透射比的理论计算公式。结果表明,晶体光轴的不平行不会对棱镜的消光比造成影响;而晶体光轴的横向不平行会对出射光束透射比产生一定影响;晶体光轴的纵向不平行会对出射光束的偏离角产生影响。对于高精度的Glan-Thompson棱镜,由晶体光轴产生的对棱镜透射比和出射光束偏离角的影响是必须要避免的。

In order to analyze the effect of the misalignment of crystal optical axis on the performance of a Glan-Thompson prism, the beam deflection angle, the extinction ratio and the transmittance was discussed by theoretical calculation based on the birefringence of iceland spar crystals. The theoretical calculation formulas were given. It is concluded that the misalignment of optical axis of crystal has no effect on the extinction ratio, while the misalignment of transverse direction affects the transmittance to a certain extent, and the misalignment of longitudinal direction affects the beam deflection angle. For high-precision Glan- Thompson prism, the effect of misalignment of optical axis on extinction ratio and beam deflection angle must be avoided.