Beam nonuniformity compensating by the programmable spatial shaper for the integration test bed

Junpu Zhao; Yue Liang; Sen Li; Zhaoyu Zong; Jun Tang; Wenyi Wang; Ping Li; Runchang Zhao; Fa Zeng; Yanwen Xia; Lin Chen; Bo Chen; Kuixing Zheng; Xiaofeng Wei; Qihua Zhu

doi:10.1117/12.2524006

24 January 2019 Beam nonuniformity compensating by the programmable spatial shaper for the integration test bed

Junpu Zhao, Yue Liang, Sen Li, Zhaoyu Zong, Jun Tang, Wenyi Wang, Ping Li, Runchang Zhao, Fa Zeng, Yanwen Xia, Lin Chen, Bo Chen, Kuixing Zheng, Xiaofeng Wei, Qihua Zhu

Author Affiliations +

Proceedings Volume 11052, Third International Conference on Photonics and Optical Engineering; 110521R (2019) https://doi.org/10.1117/12.2524006
Event: The International Conference on Photonics and Optical Engineering, 2018, Xi'an, China

Abstract

The Integration Test Bed (ITB) is a large-aperture single-beam Nd:glass laser system, built to demonstrate the key technology and performance of the laser drivers. The phase II designed output of the ITB at 1053nm is 18.2kJ with the peak power of 3.6TW. So it is important to keep a flat spatial intensity profile at the end of the system to avoid optical elements damage or small-scale self-focusing. Applying the Liquid Crystal Programmable Spatial Shaper (LCPSS) to compensate the beam non-uniformity related to amplification and transmission is an effective way at present. In this paper, we attempt to pre-compensate the beam nonuniformity by the LCPSS. Experiments were carried out to study the spatial fluence modulation and contrast improvement at the main laser output of the ITB laser facility. The results show that the peak-to-average fluence modulation in the near-field is typically 1.35:1; the contrast is about 0.08, at the designed energy and power, which meet the modulation less than 1.4:1 and the contrast under 0.1 design requirement.

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Junpu Zhao, Yue Liang, Sen Li, Zhaoyu Zong, Jun Tang, Wenyi Wang, Ping Li, Runchang Zhao, Fa Zeng, Yanwen Xia, Lin Chen, Bo Chen, Kuixing Zheng, Xiaofeng Wei, and Qihua Zhu "Beam nonuniformity compensating by the programmable spatial shaper for the integration test bed", Proc. SPIE 11052, Third International Conference on Photonics and Optical Engineering, 110521R (24 January 2019); https://doi.org/10.1117/12.2524006

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KEYWORDS

Near field

Laser systems engineering

High power lasers

Modulation

Beam shaping

Image filtering

Calibration

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