Alignment of multi-beam laser emission system

Sheng-bo MU; Yang LI; He-fei LIU; Chao YANG

doi:10.37188/OPE.20212909.2058

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Alignment of multi-beam laser emission system

Modern Applied Optics | 更新时间：2021-10-08

- Alignment of multi-beam laser emission system
- Optics and Precision Engineering Vol. 29, Issue 9, Pages: 2058-2064(2021)
- 作者机构：
  
  北京空间机电研究所，北京 100094
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20212909.2058
  CLC： V19
- Received：22 February 2021，
  
  Revised：02 March 2021，
  
  Published：15 September 2021
- 稿件说明：
移动端阅览
穆生博,李洋,刘鹤飞等.多波束激光发射系统的装调[J].光学精密工程,2021,29(09):2058-2064.

MU Sheng-bo,LI Yang,LIU He-fei,et al.Alignment of multi-beam laser emission system[J].Optics and Precision Engineering,2021,29(09):2058-2064.
穆生博,李洋,刘鹤飞等.多波束激光发射系统的装调[J].光学精密工程,2021,29(09):2058-2064. DOI： 10.37188/OPE.20212909.2058.

MU Sheng-bo,LI Yang,LIU He-fei,et al.Alignment of multi-beam laser emission system[J].Optics and Precision Engineering,2021,29(09):2058-2064. DOI： 10.37188/OPE.20212909.2058.

摘要

为了实现复杂结构的多波束激光之间角度匹配以及收发平行的问题，提出了共基准装调方法，将发射部分与接收部分分开装调，然后通过统一基准进行对接。针对该发射系统的波束多，波束之间角度要求严格，扩束倍率大以及发散角要求严格等特点，对发射部分的装调方法进行了研究。根据结构设计上的收发关系建立了统一的基准，即激光发射系统的底板，该底板也是与接收对接的接口。分析了扩束镜头对激光发散角以及出射方向角度的影响，并根据分析结果先对激光器进行角度调整，使用大口径长焦距平行光管与高精度多光轴标校系统，对激光器的出射光方向和发散角进行测试并调整到位，使激光器出射光的角度满足所需要的角度要求，误差在1'以内；最后与扩束镜头对接，根据扩束镜头对发散角以及激光出射方向的影响，调整扩束镜头正负透镜组之间的间距以及扩束镜头的整体位置使得激光发散角与出射角度满足所需要的角度，发散角误差在5 μrad，出射角度之间的误差在5″以内。实测结果显示，各个激光出射角度之间的偏差优于5″，发散角为（0.042±0.001）mrad，满足扩束倍率以及最终发散角的要求，具备与接收系统对接的条件。该多波束激光发射系统的装调方式合理可行，装调结果满足指标要求。

Abstract

A common baseline method was proposed to realize angle matching of multi-beams and the parallelism between the emission-receiving system with a complex structure. The emission and the receiving systems were aligned separately. They were fixed according to the baseline. The alignment method of the emission system was studied with a focus on the system with many beams， strict angle error between two beams， high magnification， and strict divergence angle requirements. First， according to the emission-receiving relationship of the structural design， the common baseline， which was the floor of the laser bracket， was built. The floor was the interface of the abutment of the emission and receiving systems. Subsequently， the effect of the expander lens， which could change the laser angle， was analyzed. The laser angle was aligned according to the result of the analysis. The long-focus and large-aperture collimator and the high-accuracy multi-beam-axis calibration system were used to test the direction of the laser and the divergence angle， and they aligned in place such that the angle of the laser beam matched the requirement and the error was less than 1'. Finally， the expander lens was abutted with the laser， according to the influence of the beam expander lens on divergence angle and the beam direction， the distance between the positive and negative lens groups was aligned， and the location of the expander was also aligned such that the divergence and beam angles matched the requirement. The error of the divergence angle is 5 μrad. The error of the angle between two beams is less than 5″. The test results show that the deviation of emissive angles is less than 5″ and the divergence angle is （0.042±0.01） mrad. The beam expansion ratio and final divergence angle matched the requirement. It had the conditions for abutting with the receiving system. The results show that the alignment method of the multi-beam laser emission system is of high precision and effective in practical applications.

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