Active control technology of petawatt laser signal-to-noise ratio based on isolated pre-pulse

Ke Hou; Xiaoping Ouyang; Panzheng Zhang; Yang Wang; Wei Fan; Baoqiang Zhu; Jian Zhu; Jianqiang Zhu

doi:10.1117/12.2691565

16 October 2023 Active control technology of petawatt laser signal-to-noise ratio based on isolated pre-pulse

Ke Hou, Xiaoping Ouyang, Panzheng Zhang, Yang Wang, Wei Fan, Baoqiang Zhu, Jian Zhu, Jianqiang Zhu

Proceedings Volume 12792, Eighteenth National Conference on Laser Technology and Optoelectronics; 127921S (2023) https://doi.org/10.1117/12.2691565
Event: Eighteenth National Conference on Laser Technology and Optoelectronics, 2023, Shanghai, China

Abstract

With the development of ultrafast laser technology, the peak energy of ultrashort pulses continues to increase. In addition to the demand for energy enhancement, many frontier physical experiments also put forward more stringent requirements for signal-to-noise ratio (SNR) of lasers. When the petawatt-level laser interacts with the target for physical experiments, the pre-pulses interact with the target in advance, affecting the density scale length of the pre-plasma and changing the spectral distribution of the generated electrons. In order to meet the requirements of pre-pulse control schem, we developed a SNR active control module based on isolated pre-pulses, which generates an isolated pre-pulse with adjustable time delay and relative intensity. The time delay of the isolated pre-pulse can be continuously adjusted in the range of -1300 ps to 0 ps. At the same time, by controlling the number of attenuators in the pre-pulse optical path, the relative intensity of the pre-pulse can be adjusted in the range of 10^-8 to 10^-3. We placed the module in front of the main amplification chain of the ShenguangⅡ ninth picosecond petawatt laser, adjusted the time delay and relative intensity of the pre-pulse, and measured the SNR at the terminal. The results verified the feasibility of the SNR active control scheme based on isolated pre-pulse.

Citation Download Citation

Ke Hou, Xiaoping Ouyang, Panzheng Zhang, Yang Wang, Wei Fan, Baoqiang Zhu, Jian Zhu, and Jianqiang Zhu "Active control technology of petawatt laser signal-to-noise ratio based on isolated pre-pulse", Proc. SPIE 12792, Eighteenth National Conference on Laser Technology and Optoelectronics, 127921S (16 October 2023); https://doi.org/10.1117/12.2691565

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