高精度连续变倍率激光扩束系统设计

张洁; 倪小龙; 刘智; 齐冀; 姚海峰

doi:10.3788/CO.20191203.0693

高精度连续变倍率激光扩束系统设计

doi: 10.3788/CO.20191203.0693

张洁¹,
倪小龙^{2, 3},
刘智^2, ,,
齐冀²,
姚海峰²

1.
长春理工大学电子信息工程学院, 吉林长春 130000
2.
长春理工大学空间光电技术研究所, 吉林长春 130000
3.
长春光客科技有限公司, 吉林长春 130000

基金项目:

国家自然科学基金 61475025

国家自然科学基金 61775022

吉林省科技发展计划 20170521001HJ

吉林省科技发展计划 20180519012JH

中国博士后科学基金资助项目 2017M621179

详细信息

作者简介:
张洁(1992-), 女, 河南安阳人, 硕士研究生, 2012年于郑州航空工业管理学院获得学士学位, 主要从事液晶空间光调制器和大气激光传输方面的研究。E-mail:1061674754@qq, com

刘智(1971-), 男, 吉林长春人, 博士, 教授, 1993年、2001年于长春光学精密机械学院分别获得学士、硕士学位, 2004年于中国科学院长春光学精密机械与物理研究所获得博士学位, 主要从事空间激光通信技术和激光在复杂信道中传输特性方面的研究。E-mail:liuzhiqi@cust.edu.cn

中图分类号: TN246
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出版历程
- 收稿日期: 2018-08-31
- 修回日期: 2018-10-30
- 刊出日期: 2019-06-01

Design of laser beam expansion systems with high precision and continuous variable ratios

ZHANG Jie¹,
NI Xiao-long^{2, 3},
LIU Zhi^{2
, ,},
QI Ji²,
YAO Hai-feng²

1.
College of Electronic Information Engineering, Changchun University of Science and Technology, Changchun 130000, China
2.
Institute of Space Optics and Electronics, Changchun University of Science and Technology, Changchun 130000, China
3.
Changchun Guang Ke Technology Co., Ltd., Changchun 130000, China

Funds:

National Natural Science Foundation of China 61475025

National Natural Science Foundation of China 61775022

Program of Jilin province Science and Technology Development Plan 20170521001HJ

Program of Jilin province Science and Technology Development Plan 20180519012JH

China Postdoctoral Science Foundation 2017M621179

More Information

Corresponding author: LIU Zhi, E-mail:liuzhiqi@cust.edu.cn

摘要

摘要: 为了实现对激光束的准直变倍扩束，提出了一种基于液晶空间光调制器（Liquid Crystal Spatial Light Modulator，LC-SLM）实现数字变焦透镜的方法，并利用这种方法搭建了基于LC-SLM的变焦扩束系统。首先根据透镜相位变换原理和LC-SLM的相位调制特性由计算机编程生成不同焦距的数字透镜相位调制图，实现不同焦距的数字透镜功能，通过凸透镜对平行光束的汇聚作用，验证该功能的有效性，平均误差为0.95%。上述结果说明LC-SLM能够实现变焦透镜功能。接下来，通过与汇聚透镜组合实现对激光束的连续变倍率准直扩束。该系统的扩束倍率为2^×~5^×，均方根误差为0.539 7 mm，峰谷值为0.99 mm。实验结果表明，本文提出的方法可以实现对激光束不同倍率的扩束且扩束比连续可变。该系统解决了传统变焦系统无法满足多变的激光扩束需求的问题，且结构简单，精度高，在激光扩束应用方面具有广泛应用前景。
- 数字变焦透镜 /
- 液晶空间光调制器 /
- 激光扩束系统 /
- 相位调制图
Abstract: In order to achieve collimation and zoom expansion in laser beams, a method of creating digital zoom lenses based on LC-SLM(Liquid Crystal Spatial Light Modulator) is proposed and a zoom beam expansion system based on LC-SLM is built using this method. Firstly, according to the principles of lens phase transformation and the phase modulation characteristics of LC-SLM, the phase modulation maps of digital lenses with different focal lengths are generated using computer programming to obtain the function of digital lenses with different focal lengths. The effectiveness of the function is verified with the convergence of convex lenses to parallel beams. The average error is 0.95%. It can be concluded that LC-SLM can achieve the function of digital lenses with different focal lengths and realize a zoom lens' function. A 2^×~5^× continuous magnification collimation of the laser beam is then attained by combining it with the converging lens. The beam expansion error is 0.539 7 mm, and the peak valley value is 0.99 mm. The experimental results show that the method proposed in this paper can be used to expand the laser beam to different multiples and the beam expansion ratio can be varied continuously. This system solves the problem that the traditional zoom systems cannot meet the changing demands of laser beam expansion. It has a simple structure with high precision and has great significance in the applications of laser beam expansion.
- digital zoom lens /
- liquid crystal spatial light modulator /
- laser beam expanding system /
- phase modulation map

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图 1 激光通过扩束系统的传输

Figure 1. Transmission of laser beam through a beam expansion system

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图 2 基于LC-SLM的变焦模块

Figure 2. Zoom module based on LC-SLM

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图 3 λ=785 mm时不同焦距的变焦透镜相位调制图

Figure 3. Phase modulation diagrams of zoom lens with different focal lengths when λ=785 mm

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图 4 基于LC-SLM的变焦透镜实验系统图

Figure 4. Experimental system diagram of a zoom lens based on LC-SLM

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图 5 凸透镜对平行光的汇聚作用示意图

Figure 5. Schematic of convergence effect for convex lens to parallel light

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图 6 相机接收的光斑图像

Figure 6. Spot images received by the camera

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图 7 LC-SLM变焦透镜焦距曲线

Figure 7. Focal length curve of a LC-SLM zoom lens

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图 8 基于SC-SLM的变倍率扩束系统实验图

Figure 8. Experimental diagram of magnification beam expansion system based on SC-SLM

下载: 全尺寸图片幻灯片

图 9 不同扩束倍率对应的相位调制图与相机接收到的光斑图

Figure 9. Phase modulation diagrams corresponding to different beam expansion ratios and the spot patterns received by the camera

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图 10 光斑直径曲线

Figure 10. Light spot diameter

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表 1 基于LC-SLM变焦透镜焦距理论值与测量值

Table 1. Theoretical values and measurement values of focal length of zoom lens based on LC-SLM

f_LC-SLM理论值/mm	200	300	400	500	600	700	800	900	1000
f_LC-SLM测量值/mm	200	300	405	491	604	708	812	910	989

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表 2 经基于LC-SLM变倍率激光扩束系统扩束后的光斑直径实测值与理论值数据

Table 2. Measured values and theoretical values of spot diameter by using magnification laser beam expanding system based on LC-SLM

扩束倍率M	f_LC-SLM/mm	理论光斑直径/mm	实测光斑直径/mm
2^×	-750	12	12.32
3^×	-500	18	17.05
4^×	-375	24	24
5^×	-300	30	30.4

下载: 导出CSV

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