等厚二元结构零级波片设计原理及性能分析  

Design Principle and Performance Analysis of Equal-Thickness Binary Structure of Zero-Order Waveplate

作　　者：吴闻迪 韩培高 马任德 Wu Wendi;Han Peigao;Ma Rende(Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,School of Physical Engineering,Qufu Normal University,Qufu 273165,Shandong,China)

机构地区：[1]曲阜师范大学物理工程学院,山东省激光偏光与信息技术重点实验室,山东曲阜273165

出　　处：《中国激光》2024年第22期73-79,共7页Chinese Journal of Lasers

摘　　要：为了减小双折射晶体常规设计两片组合零级波片厚度偏差对相位延迟量的影响,本课题组提出了一种新型的二元结构零级波片设计方案,根据单轴晶体中光的传播理论推导了等厚二元结构零级波片的普适性设计原理公式,并分析了等厚二元结构零级波片的光学性能。结果表明:在相同的厚度制作偏差下,等厚二元结构零级波片产生的相位延迟量偏差小于常规设计二元复合零级波片的1.3%;等厚二元结构零级波片与常规设计真零级波片具有相同的消色差性能;温度变化对等厚二元结构零级波片相位延迟量的影响小于对目前常规设计真零级波片的影响。制作了测试样品,并利用椭偏光谱仪对样品进行了相位延迟量测试,测试结果与理论分析结果相同。Objective In modern applications of polarized optical technology, linear and circular polarizations are the predominant types of polarized light. The transformation between these two forms of polarized light requires the use of optical phase retarders. Zero-order waveplates measure only a few tens of micrometers thick, and high precision is required during their production to achieve such thickness, which poses considerable fabrication challenges. This study introduces an innovative design for a binary compositestructure waveplate using two quartz crystals of equal thickness. By customizing the optical axis angle of one crystal, a zero-order phase delay can be achieved for a designated light wavelength. This novel zero-order waveplate structure can effectively mitigate the effects of thickness variations on the phase delay of the output light during the manufacturing process.Methods The proposed zero-order waveplate features a binary structure with equal-thickness components comprising two parallel crystal plates fabricated using identical birefringent materials, each with thickness d, bonded together(Fig. 1). We define a coordinate system, as shown in Fig. 1(a), where the bonding interface of the two crystal plates is aligned with the yoz plane. Figure 1(b) shows a cross-sectional view of the device. The optical axis of the crystal on the left side of the xoy plane, denoted as crystal 1, lies within the xoy plane and is perpendicular to the xoz plane. Meanwhile, the optical axis of the crystal on the right side, denoted as crystal 2, is within the xoy plane and forms an angle γ with the x-axis while maintaining a thickness equal to that of crystal 1. The phase delay of light incident on this binary structure can be fine-tuned by adjusting the optical axis angle of crystal 2, thus resulting in a smaller phase delay for a specific light wavelength. The differential phase delay is quantified as shown in Eq.(8). A zero-order phase delay of 1/4wavelength corresponds to a specific relationship among the optical axis

关 键 词：偏振光学 零级波片 相位延迟量 消色差 温度效应 

分 类 号：O436.3[机械工程—光学工程]