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激光等离子体相互作用（LPI）过程一直以来是惯性约束聚变（ICF）点火中重要的研究内容，宽带激光在理论上一直以来被认为具有抑制LPI的潜力。宽带二倍频激光装置—“昆吾”，为实验研究宽带激光LPI效果提供了可靠的实验研究平台。针对大尺度低密度等离子体的LPI过程中强烈的受激布里渊散射（SBS）和受激拉曼散射（SRS）信号，开展了相同条件下宽带和窄带激光驱动C8H8平面薄膜靶的透过激光、前向散射和大角度近前向散射的实验研究。主要针对宽带和窄带激光前向透过信号的组分和近前向散射的光谱及份额信息进行对比研究，发现宽带和窄带激光驱动的LPI过程具有显著差异。同时，初步结果显示宽带激光相比于窄带激光体现出更强的穿透能力，烧蚀靶并穿过等离子体的时间提前了近1ns，透过能量提升了近10倍，穿透等离子体后有更小的空间发散角。这些结果对于更好地理解宽带激光对于LPI的作用效果具有很好的参考价值。
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关键词:
- 激光等离子体相互作用(LPI) /
- 宽带激光 /
- 受激布里渊散射(SBS) /
- 受激拉曼散射(SRS)
Laser plasma interaction (LPI) have always been a crucial research topic in the ignition phase of inertial confinement fusion (ICF). Over the years, researchers have attempted to use various laser beam smoothing schemes and optimized light source solutions to suppress the development of LPI. Among these, low-coherence laser drivers have recently attracted widespread attention in the fields of laser-plasma physics and laser technology. Recently, a broadband second harmonic laser facility named "Kunwu" has provided a reliable experimental research platform for the LPI process driven by broadband lasers. Aiming at the strong stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) in the LPI process of large-scale low-density plasma, forward scattering and near-forward scattering experiments of C8H8planar film targets driven by broadband and narrowband lasers under the same conditions were carried out. Based on the "Kunwu" laser facility, two sets of measurement systems have been designed, one centered around fiber-heads and spectrometer, and the other around phototubes and oscilloscope. These systems enable multi-directional precise measurements of scattered light, allowing for a comprehensive analysis of LPI. The main focus is on the comparison of the components and spectral information of the scattering beams for broadband and narrowband lasers, and it is found that the LPI processes driven by broadband and narrowband lasers have significant differences. Additionally, preliminary results indicate that broadband lasers exhibit a stronger penetration capability compared to narrowband lasers. The time to ablation the target and penetrate the plasma were nearly 1 ns ahead, with the transmitted energy increased by nearly an order of magnitude. And after penetrating the plasma, there was a smaller spatial divergence angle. These results have good reference value for better understanding the effect of broadband lasers on LPI.-
Keywords:
- Laser plasma interaction (LPI) /
- Broadband laser /
- Stimulated Brillouin scattering (SBS) /
- Stimulated Raman scattering (SRS)
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