Wollaston式多光束分束棱镜的设计研究

Design of Wollaston-type multi-beams splitting prism

基于方解石晶体的光学特性和传统Wollaston棱镜的结构特点,设计了一种新型Wollaston式多光束分束棱镜。棱镜的两块晶体的光轴不再是垂直的,而是呈现一定的角度。通过结合玻璃棱镜,可以实现三束或四束光束平行光束的出射。以晶体光轴夹角为45°角为例,对该棱镜进行了讨论研究。研究得出:当一束自然单色光入射时,当入射光束的光斑大小大于两平行光束之间的距离时,可以实现两束相互垂直的偏振光和一束自然光出射,当光斑大小小于棱镜中两平行光束之间的距离时,能够产生四束分开程度可调并且平行出射的偏振光。该棱镜能为不同的应用环境提供可调节的偏振出射光束,从而节约成本。

A new kind of Wollaston-type splitting prism is designed based on the structure of the traditional Wollaston prism and the optical property of uniaxial crystal.Optical axis of two pieces of crystal of the prism is obtained included angle of around 45°instead of 90°.Take the angle of 45°as an example,three beams of two polarized beams and a nature beam can be obtained when the light spots is larger than the distance of the parallel output beam,and four polarized beams can be obtained with light spots smaller than the distance of the parallel output beam.The new prism has potential applications for polarization measurement technology with reduced cost.