Wu Wendi
School of Physics and Engineering, Qufu Normal University, Qufu, Shandong 273165, China.
Heliyon. 2022 Aug 17;8(8):e10293. doi: 10.1016/j.heliyon.2022.e10293. eCollection 2022 Aug.
In this study, to improve the uniformity of transmission light intensity of depolarizer, we present an optimal design of the quaternion space pseudo-depolarizer consisting of four wedge crystals. By designing the optical axis and wedge angle of each crystals, the square distribution of the output spot is realized. The mathematical expression of the degree of depolarization is obtained using the light wave superposition method. Theoretical analysis shows that the new type of depolarizer can optimize the intensity distribution of the emergent light field when the depolarizer wedge angle is sufficiently large, and it can realize the perfect depolarization of monochromatic linear polarized light. A samples of the quartz crystal material are developed and tested using lasers of 405 nm and 670 nm wavelengths. The degree of depolarization is observed to be 99% for any azimuth angle, whereas the angle of field of view is -10°-10°.
在本研究中，为提高去偏振器透射光强的均匀性，我们提出了一种由四个楔形晶体组成的四元数空间伪去偏振器的优化设计。通过设计每个晶体的光轴和楔角，实现了输出光斑的方形分布。利用光波叠加法得到了去偏振度的数学表达式。理论分析表明，当去偏振器楔角足够大时，新型去偏振器可以优化出射光场的强度分布，并且能够实现单色线偏振光的完美去偏振。开发了石英晶体材料的样品，并使用波长为405nm和670nm的激光进行测试。观察到在任何方位角下去偏振度均为99%，而视场角为-10°至10°。
