Jun. 2019

Article Contents

Chinese Optics> 2019> 12(3): 693-700.

ZHANG Jie, NI Xiao-long, LIU Zhi, QI Ji, YAO Hai-feng. Design of laser beam expansion systems with high precision and continuous variable ratios[J]. Chinese Optics, 2019, 12(3): 693-700. doi: 10.3788/CO.20191203.0693

Citation:

ZHANG Jie, NI Xiao-long, LIU Zhi, QI Ji, YAO Hai-feng. Design of laser beam expansion systems with high precision and continuous variable ratios[J].Chinese Optics, 2019, 12(3): 693-700.doi:10.3788/CO.20191203.0693

Citation:

ZHANG Jie, NI Xiao-long, LIU Zhi, QI Ji, YAO Hai-feng. Design of laser beam expansion systems with high precision and continuous variable ratios[J].Chinese Optics, 2019, 12(3): 693-700.doi:10.3788/CO.20191203.0693

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

doi:10.3788/CO.20191203.0693

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 China61475025

National Natural Science Foundation of China61775022

Program of Jilin province Science and Technology Development Plan20170521001HJ

Program of Jilin province Science and Technology Development Plan20180519012JH

China Postdoctoral Science Foundation2017M621179

More Information

Corresponding author:LIU Zhi, E-mail:liuzhiqi@cust.edu.cn
Received Date:31 Aug 2018
Rev Recd Date:30 Oct 2018
Publish Date:01 Jun 2019

Abstract

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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References (17)

References

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