神光Ⅱ充气黑腔靶受激拉曼散射测量

摘要

The potential for laser‐plasma instability is a serious concern for indirect‐drive inertial confinement fusion (ICF) .In this study ,experiments were performed at the Shenguang‐Ⅱ laser facility which is Nd :glass laser operated at 351 nm wavelength . The measurements of the total laser scattering losses from stimulated Raman scattering (SRS) in gas‐filled hohlraums were presented .It demonstrates that SRS losses increase from under 0.05% to 1%‐1.5% due to the inceasement of plasma scale and radiation temperatures .%激光等离子体不稳定性可能是间接驱动惯性约束聚变（IC F ）的一个严重问题。本文基于神光Ⅱ钕玻璃激光装置开展了三倍频激光与充气黑腔靶相互作用实验研究，给出了受激拉曼散射（S RS ）反射份额和散射光谱测量结果。由于等离子体尺度的变大，黑腔内电子温度较高，S RS增长率大，背向的S RS散射光能量增加，S RS的反射率由标准黑腔靶的0.05％以下增长到1％～1.5％。