为了更合理地使用平行分束偏光镜,针对由冰洲石晶体制作的平行分束偏光镜,从理论上对剪切差的光谱特性进行了分析,并进行了实验验证。晶体中e光线相对e光波的最大离散角以及棱镜的剪切差均受入射光波长的影响;对于一般设计且长度一定的棱镜,其剪切差随入射光波长的增大而减小,且紫外波段对剪切差的影响大于可见和红外波段。结果表明,本研究对平行分束棱镜在宽光谱范围的设计和应用问题的处理具有参考价值。

The spectral characteristics of the displacement of the parallel beam splitting prism,made of iceland crystal,were analyzed theoretically and experimentally.The results indicated that,the maximum angle between the e rays and the e waves,and the displacement of the prism were influenced by the wavelength of the incident light.For a common parallel beam splitting prism with certain length,the displacement decreased with the increase of the wavelength of incident light,and the influence of the wavelength on the walk-off angle in the ultraviolet wave band was larger than that in visible and near-infrared wave band.The obtained result is favor for the design and application of parallel beam splitting prisms in wider scope.