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• High Power Laser Science and Engineering
• Vol. 10, Issue 4, 04000e24 (2022)
Hongli Wang1、2、*, Seongwoo Cha2, Hong Jin Kong2、*, Yulei Wang3, and Zhiwei Lv3
Author Affiliations
• 1School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
• 2Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
• 3School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China
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Hongli Wang, Seongwoo Cha, Hong Jin Kong, Yulei Wang, Zhiwei Lv. Output characteristics of high-power stimulated Brillouin scattering pulse compression enhanced by thermal effects based on HT270[J]. High Power Laser Science and Engineering, 2022, 10(4): 04000e24 Copy Citation Text show less

Abstract

Thermal effects are typically considered as obstacles to high-repetition-rate stimulated Brillouin scattering (SBS) pulse compression. In this paper, a novel method is proposed for improving the SBS output characteristics by exploiting thermal effects on the liquid medium. Using HT270, the SBS output parameters with the medium purification and rotating off-centered lens methods are studied at different repetition rates. The results indicate that these two methods can alleviate thermal effects and improve the energy efficiency, but the rotating method reduces the energy stability because of the aggravated optical breakdown at the kilohertz-level repetition rate. For a 35-mJ pump energy, the energy efficiency at 2 kHz without the rotating method is 30% higher than that at 100 Hz and 70% higher than that at 500 Hz. The enhancement of the SBS output characteristics by thermal effects is demonstrated theoretically and experimentally, and 2-kHz high-power SBS pulse compression is achieved with HT270.
 \begin{align}\frac{\partial {E}_{\mathrm{L}}}{\partial z}+\frac{\alpha }{2}{E}_{\mathrm{L}}+\left(\frac{n}{c}\right)\frac{\partial {E}_{\mathrm{L}}}{\partial t}=\frac{i{\omega}_{\mathrm{L}}{\gamma}^{\mathrm{e}}}{2 nc{\rho}_0}\rho {E}_{\mathrm{S}},\end{align} ((1a))

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 \begin{align}-\frac{\partial {E}_{\mathrm{S}}}{\partial z}+\frac{\alpha }{2}{E}_{\mathrm{S}}+\left(\frac{n}{c}\right)\frac{\partial {E}_{\mathrm{S}}}{\partial t}=\frac{i{\omega}_{\mathrm{S}}{\gamma}^{\mathrm{e}}}{2 nc{\rho}_0}{\rho}^{\ast }{E}_{\mathrm{L}},\end{align} ((1b))

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 \begin{align}\frac{\partial^2\rho }{\partial {t}^2}-\left(2 i\omega -{\Gamma}_{\mathrm{B}}\right)\frac{\partial \rho }{\partial t}-\left( i\omega {\Gamma}_{\mathrm{B}}\right)\rho =\frac{\gamma^{\mathrm{e}}}{4\pi }{q_{\mathrm{B}}}^2{E}_{\mathrm{L}}{E_{\mathrm{S}}}^{\ast }.\end{align} ((1c))

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 \begin{align}{g}_{\mathrm{B}}(T)=\left[4{\pi}^2{\left({\gamma}^{\mathrm{e}}\right)}^2\right]/\left({\lambda}^2ncv{\rho}_0{\Gamma}_{\mathrm{B}}\right).\end{align} ((2))

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Hongli Wang, Seongwoo Cha, Hong Jin Kong, Yulei Wang, Zhiwei Lv. Output characteristics of high-power stimulated Brillouin scattering pulse compression enhanced by thermal effects based on HT270[J]. High Power Laser Science and Engineering, 2022, 10(4): 04000e24