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用于周向探测的均匀配光非球面柱透镜设计

Design of Aspheric Cylindrical Lens of Uniform Light Distribution for Circumferential Detection

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摘要

针对周向探测系统对探测激光光束发散角大小和能量均匀分布的要求, 提出了一种基于非球面柱透镜阵列的分区探测方案。探测系统光源为快轴准直的半导体激光器阵列, 激光慢轴由非球面柱透镜阵列进行配光。提出了平行光线光源近似方法来简化复杂的高斯光束相关计算, 并最终得到非球面曲线方程。应用上述方程确定的非球面柱透镜阵列, 得到发散角可调且功率密度关于弧矢面平面角均匀分布的出射光束, 均匀度可达98.64%。为减小光学系统公差的影响, 设计了波浪型结构透镜阵列。通过误差分析可知:透镜材料的折射率误差只影响发散角的大小而不影响配光的均匀性; 波浪型透镜阵列替代传统柱透镜阵列, 避免了相邻透镜之间的楔形结构, 减小了制造难度和制造误差; 线光源长度与透镜周期对应, 使得装配时透镜偏心和倾斜产生的公差影响减弱。

Abstract

A solution of partition detection based on aspheric cylindrical lens array is proposed, which aims at the requirements of circumferential detection system on the detection laser beam divergence angle and energy distribution. Source of the detection system is a fast-axis collimated laser diode array. Slow-axis light power is distributed via aspheric cylindrical lens array. Collimated line source approximation is put forward to simplify the complicated process of corresponding calculation on Gaussian beam, and an equation of the aspheric curve is finally established. The aspheric cylindrical lens array is determined by applying this equation, the system can obtain outgoing beam with adjustable divergence angle and uniform power density distribution about plane angle in sagittal plane. And the evenness can reach 98.64%. A lens array with wavy structure is designed to diminish the effect of tolerance of optical system. According to tolerance analysis, the refractive index tolerance of lens material only influences the beam divergence angle instead of the evenness of light distribution. And the traditional structure of lens array is replaced by wavy structure so that wedge shape between adjacent lens can be eliminated effectively, which reduces the difficulty and tolerance in manufacture. Moreover, the length of line source is consistent with the periods of lens array, which weakens the influences of tolerance of lens eccentricity and lens tilt during fabrication.

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中图分类号:O439

DOI:10.3788/aos201737.0522003

所属栏目:光学设计与制造

收稿日期:2016-12-26

修改稿日期:2017-01-18

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作者单位    点击查看

郑 翔:中国科学院半导体研究所, 北京 100083
赵柏秦:中国科学院半导体研究所, 北京 100083

联系人作者:郑翔(zhengxiang@semi.ac.cn)

备注:郑 翔(1992—), 男, 硕士研究生, 主要从事空间探测光学系统方面的研究。

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引用该论文

Zheng Xiang,Zhao Baiqin. Design of Aspheric Cylindrical Lens of Uniform Light Distribution for Circumferential Detection[J]. Acta Optica Sinica, 2017, 37(5): 0522003

郑 翔,赵柏秦. 用于周向探测的均匀配光非球面柱透镜设计[J]. 光学学报, 2017, 37(5): 0522003

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