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Optical Engineering

Temporal contrast enhancement for optical parametric chirped-pulse amplifiers by adopting cascaded second harmonic generation pump
Author(s): Qinghua Deng; Xiaoming Zeng; Dongbin Jiang; Na Xie; Kainan Zhou; Xuemin Wang; Weihua Li; Weidong Wu; Lei Ding
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Paper 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.

Paper Details

Date Published: 15 July 2016
PDF: 6 pages
Opt. Eng. 55(7) 076104 doi: 10.1117/1.OE.55.7.076104
Published in: Optical Engineering Volume 55, Issue 7
Show Author Affiliations
Qinghua Deng, China Academy of Engineering Physics (China)
Xiaoming Zeng, China Academy of Engineering Physics (China)
Dongbin Jiang, China Academy of Engineering Physics (China)
Na Xie, China Academy of Engineering Physics (China)
Kainan Zhou, China Academy of Engineering Physics (China)
Xuemin Wang, China Academy of Engineering Physics (China)
Weihua Li, China Academy of Engineering Physics (China)
Weidong Wu, China Academy of Engineering Physics (China)
Lei Ding, China Academy of Engineering Physics (China)


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