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Proceedings Paper

Beam shaping by using small-aperture SLM and DM in a high power laser
Author(s): Sensen Li; Zhiwei Lu; Pengyuan Du; Yulei Wang; Lei Ding; Xiusheng Yan
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Paper Abstract

High-power laser plays an important role in many fields, such as directed energy weapon, optoelectronic contermeasures, inertial confinement fusion, industrial processing and scientific research. The uniform nearfield and wavefront are the important part of the beam quality for high power lasers, which is conducive to maintaining the high spatial beam quality in propagation. We demonstrate experimentally that the spatial intensity and wavefront distribution at the output is well compensated in the complex high-power solid-state laser system by using the small-aperture spatial light modulator (SLM) and deformable mirror (DM) in the front stage. The experimental setup is a hundred-Joule-level Nd:glass laser system operating at three wavelengths at 1053 nm (1ω), 527 nm (2ω) and 351 nm (3ω) with 3 ns pulse duration with the final output beam aperture of 60 mm. While the clear arperture of the electrically addressable SLM is less than 20 mm and the effective diameter of the 52-actuators DM is about 15 mm. In the beam shaping system, the key point is that the two front-stage beam shaping devices needs to precompensate the gain nonuniform and wavefront distortion of the laser system. The details of the iterative algorithm for improving the beam quality are presented. Experimental results show that output nearfield and wavefont are both nearly flat-topped with the nearfield modulation of 1.26:1 and wavefront peak-to-valley value of 0.29 λ at 1053nm after beam shaping.

Paper Details

Date Published: 5 March 2018
PDF: 16 pages
Proc. SPIE 10710, Young Scientists Forum 2017, 107103Q (5 March 2018); doi: 10.1117/12.2317534
Show Author Affiliations
Sensen Li, Science and Technology on Electro-optical Information Security Control Lab. (China)
Harbin Institute of Technology (China)
Zhiwei Lu, Harbin Institute of Technology (China)
Pengyuan Du, Shanghai Institute of Laser and Plasma (China)
Yulei Wang, Harbin Institute of Technology (China)
Lei Ding, Research Ctr. of Laser Fusion (China)
Xiusheng Yan, Science and Technology on Electro-optical Information Security Control Lab. (China)

Published in SPIE Proceedings Vol. 10710:
Young Scientists Forum 2017
Songlin Zhuang; Junhao Chu; Jian-Wei Pan, Editor(s)

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