激光束散角复合控制技术

倪小龙; 朱旭芳; 于信; 姚海峰; 陈纯毅; 刘智

doi:10.11884/HPLPB202032.200078

激光束散角复合控制技术

doi: 10.11884/HPLPB202032.200078

倪小龙^{1, 2,},
朱旭芳¹,
于信^{2, 3},
姚海峰^{1, 2},
陈纯毅⁴,
刘智^1, ,

1.
长春理工大学空间光电技术国家地方联合工程研究中心，长春 130022
2.
长春光客科技有限公司，长春 130000
3.
长春理工大学光电工程学院，长春 130022
4.
长春理工大学计算机科学技术学院，长春 130022

基金项目: 国家自然科学基金项目（61475025，61775022）；中国博士后科学基金项目（2017M621179）；吉林省科技发展计划项目（20170521001HJ，20180519012JH）

详细信息

作者简介:
倪小龙（1988—），男，讲师，博士，主要从事大气光学、自由空间光通信方面的研究； nxl@cust.edu.cn

通讯作者:
刘　智（1971—），男，教授，博士，主要从事自由空间光通信系统性能优化技术、激光大气传输特性与机理等方面研究；liuzhi@cust.edu.cn

中图分类号: O436; O439
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出版历程
- 收稿日期: 2020-03-25
- 修回日期: 2020-06-09
- 刊出日期: 2020-06-24

Laser beam coherence and divergence angle complex controlling technique

Ni Xiaolong^{1, 2
,},
Zhu Xufang¹,
Yu Xin^{2, 3},
Yao Haifeng^{1, 2},
Chen Chunyi⁴,
Liu Zhi^{1
, ,}

1.
National and Local Joint Engineering Research Center of Space Optoelectronics Technology, Changchun University of Science and Technology, Changchun 130022, China
2.
Changchun Lighteek Photonics Co., Ltd, Changchun 130000, China
3.
College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
4.
School of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China

摘要

摘要: 为了降低部分相干光光学系统设计的复杂度及成本，增加部分相干光应用的便捷性，提出了一种液晶空间光调制器的激光相干度及束散角复合控制方法。首先介绍了对激光光束进行相干度和束散角复合控制的基本理论和方法；然后分别设置了相干度和束散角检测实验，检测了本方法所调制激光光束的相干度和束散角的准确性。实验结果表明，采用液晶空间光调制器生成相干度为0.9 mm、束散角为7.5 mrad，以及相干度为1.5 mm、束散角为3.8 mrad的部分相干光束，其相干度与理论值相比误差在5%以内，其相干度均方根误差分别为0.027386和0.031314，峰谷值分别为0.084 658和0.089 103；其束散角与理论值相比误差在5%以内，其束散角均方根误差分别为0.022 478和0.023 186，峰谷值分别为0.081 201和0.092 130。可见，该方法可以实现高精度的相干度及束散角复合控制。
- 大气光学 /
- 相干 /
- 液晶空间光调制器 /
- 束散角
Abstract: To reduce the complexity and cost of partially coherent optical system, increase the convenience of partially coherent laser beam application, in this paper, we presents a method to control the coherence and divergence angle of laser beam complexly, using a liquid crystal spatial light modulator (LC-SLM). First, we introduce the basic theory and method to control the coherence and divergence angle of laser beam complexly using an LC-SLM; then, we put forward the experiment to test the coherence and divergence angle controlling accuracy. The experiment results show that, for a partially coherent laser beam with the coherence and divergence angle of 0.9 mm, 7.5 mrad and 1.5 mm, 3.8 mrad, the error of coherence is less than 5%, the root-mean-square errors of the degree of coherence are 0.027 386 and 0.031 314, and the peak-to-valley values are 0.084 658 and 0.089 103 respectively; the error of divergence angle is less than 5%, the root-mean-square errors of the divergence angle are 0.022 478 and 0.023 186, and the peak-to-valley values are 0.081 201 and 0.092 130 respectively. This method can control degree of coherence and divergence angle with high accuracy.
- atmospheric optics /
- coherence /
- liquid crystal spatial light modulator /
- divergence angle

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图 1 复合相位屏

Figure 1. Complex phase map

下载: 全尺寸图片幻灯片

图 2 相干长度检测实验示意图

Figure 2. Experimental setup for testing the coherence width

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图 3 干涉条纹

Figure 3. Interference fringes

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图 4 实验测得相干长度

Figure 4. Coherence widths measured in experiment

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图 5 束散角测量原理图

Figure 5. Schematic of beam divergence angle measurement

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图 6 测量光斑图

Figure 6. Diagram of measurement spot

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图 7 实验测得的束散角

Figure 7. The divergence angle measured in experiment

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表 1 双孔参数选择表

Table 1. Selection table of double pinhole

aperture		hole spacing/mm
d＝0.9 mm	d＝1.5 mm	d＝0.9 mm	d＝1.5 mm
0.09	0.015	0.799763	2.221564
0.09	0.16	0.891094	2.527646
0.10	0.17	0.987362	2.853476
0.11	0.18	1.194708	3.199052
0.12	0.20	1.421801	3.949447
0.13	0.25	1.668641	6.171011
0.14	0.30	1.935229	8.886256
0.15	0.35	2.221564	12.09518
0.20	0.40	3.949447	15.79779
0.25	0.45	6.171011	19.99408

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