新型光学吸收池的设计与数值模拟

为解决传统光学吸收池无法同时满足高光斑密度要求和低制造成本要求的问题,根据传输矩阵理论,提出了一种基于球面镜和柱面镜组合的新型吸收池设计。通过数值计算模拟,分析了吸收池内光束传输次数与结构参数、镜面旋转以及出射光斜率之间的关系。结果表明球面镜和柱面镜组合具有较好的抗干扰性能。给出了一种基长为65 mm、光程长为10 m的吸收池设计例子。该吸收池干涉效应较小,所占体积仅为0.29 L,适用于吸收光谱学等应用。

Design and Numerical Simulation of a New Multipass Optical Absorption Cell

To solve the problem that the traditional optical absorption cell can not meet the requirement of low cost while meets the requirement of high optical spot density, a new optical absorption cell combining spherical mirrors with astigmatic mirrors is designed according to the transfer matrix formalism. The relationship of the beam transmission number in the optical absorption cell with structure parameters, mirror rotation and emergent light slope is analyzed by numerical simulation. The results show that the combination of spherical mirrors with astigmatic mirrors has a good anti-interference capability. A design example for an optical absorption cell with the length of 65 mm and an optical path of 10 m is given. This optical absorption cell has a small interference effect. Its volume is merely 0.29 L. It is suitable for absorption spectroscopy.