Temporal contrast enhancement for optical parametric chirped-pulse amplifiers by adopting cascaded second harmonic generation pump

Qinghua Deng; Xiaoming Zeng; Dongbin Jiang; Na Xie; Kainan Zhou; Xuemin Wang; Weihua Li; Weidong Wu; Lei Ding

doi:10.1117/1.OE.55.7.076104

15 July 2016 Temporal contrast enhancement for optical parametric chirped-pulse amplifiers by adopting cascaded second harmonic generation pump

Qinghua Deng, Xiaoming Zeng, Dongbin Jiang, Na Xie, Kainan Zhou, Xuemin Wang, Weihua Li, Weidong Wu, Lei Ding

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), Natural Science Foundation of China, Foundation of Science Technology on Plasma Physics Laboratory, Science and Technology on Plasma Physics Laboratory, Foundation of Science and Technology on Plasma Physics Laboratory, Development Foundation of China Academy of Engineering Physics, China Academy of Engineering Physics

Optical Engineering, Vol. 55, Issue 7, 076104 (July 2016). https://doi.org/10.1117/1.OE.55.7.076104

Abstract

We report on a method to enhance the temporal contrast of optical parametric chirped-pulse amplifiers (OPCPAs) by smoothing pump noise. The instantaneous parametric gain in OPCPA couples the temporal modulation on the pump pulses to spectral variations of the intensity of the stretched signal pulses being amplified. In this way, pump noise significantly degrades the temporal contrast of the amplified pulses after recompression. Cascaded second harmonic generation (SHG) is adopted to smooth modulation on the pump pulses in the proposed method. Apparent reduction of modulation on the pump pulses is observed in the experiments. Numerical simulation reproduces the experimental results. Simulation results show that cascaded SHG with stable output 2 ω can enhance the temporal contrast for OPCPAs with four to five orders. It is believed that this new method can be widely adopted to build high-contrast OPCPA systems.

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Qinghua Deng, Xiaoming Zeng, Dongbin Jiang, Na Xie, Kainan Zhou, Xuemin Wang, Weihua Li, Weidong Wu, and Lei Ding "Temporal contrast enhancement for optical parametric chirped-pulse amplifiers by adopting cascaded second harmonic generation pump," Optical Engineering 55(7), 076104 (15 July 2016). https://doi.org/10.1117/1.OE.55.7.076104

Published: 15 July 2016

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