Theoretical and Natural Science

- The Open Access Proceedings Series for Conferences

Theoretical and Natural Science

Vol. 34, 02 April 2024

Open Access | Article

Variable magnification beam expander system based on semiconductor laser

Ke Zhang 1 , Zhanqiang Ru 2 , Peng Ding 3 , Kunkun Hao 4 , Tengfei Han 5 , Cheng’ao Wang 6 , Yang Xiang * 7
1 Changchun University of Science and Technology
2 Chinese Academy of Sciences
3 Chinese Academy of Sciences
4 Nanjing University of Aeronautics and Astronautics
5 Chinese Academy of Sciences
6 Changchun University of Science and Technology
7 Changchun University of Science and Technology

* Author to whom correspondence should be addressed.

Advances in Humanities Research, Vol. 34, 105-117
Published 02 April 2024. © 2023 The Author(s). Published by EWA Publishing
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Citation Ke Zhang, Zhanqiang Ru, Peng Ding, Kunkun Hao, Tengfei Han, Cheng’ao Wang, Yang Xiang. Variable magnification beam expander system based on semiconductor laser. TNS (2024) Vol. 34: 105-117. DOI: 10.54254/2753-8818/34/20241186.


Due to the different divergence angles in two perpendicular directions and the presence of astigmatism in edge-emitting semiconductor lasers, the communication distance and efficiency of underwater communication are seriously affected. Therefore, based on the fact that the semiconductor laser beam belongs to Gaussian beam, satisfying Gaussian characteristics and collimating and expanding characteristics, a system composed of fast-axis collimation mirror and variable magnification beam expander is designed. Simulation is performed, and the final divergence angle is calculated. Experimental results show that the divergence angles of the fast axis and the slow axis have been compressed from 49° and 9°, respectively, to 0.315 mrad and 0.180 mrad. Simulation demonstrates that the system can achieve propagation over a distance of 100m underwater and solve the alignment difficulty of APT. The designed structure is compact, easy for processing and adjustment, with high practical value, which helps to solve the problems of optical energy loss and low coupling efficiency in underwater long-distance communication.


Semiconductor laser, Collimation and expansion, Laser, Gaussian beam, Variable magnification beam expander


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Data Availability

The datasets used and/or analyzed during the current study will be available from the authors upon reasonable request.

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Volume Title
Proceedings of the 3rd International Conference on Computing Innovation and Applied Physics
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ISBN (Online)
Published Date
02 April 2024
Theoretical and Natural Science
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© 2023 The Author(s)
Open Access
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

Copyright © 2023 EWA Publishing. Unless Otherwise Stated