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首页> 外文期刊>Optical and quantum electronics >Self-focusing of cosh-Gaussian laser beam and its effect on the excitation of ion-acoustic wave and stimulated Brillouin backscattering in collisionless plasma
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Self-focusing of cosh-Gaussian laser beam and its effect on the excitation of ion-acoustic wave and stimulated Brillouin backscattering in collisionless plasma

机译：柯什高斯激光束的自聚焦及其对无碰撞等离子体中离子声波激发和布里渊散射的背向散射的影响

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摘要

An analytical and numerical study has been carried out for self-focusing of an intense cosh-Gaussian laser beam in collisionless plasma and its impact on the excitation of ion-acoustic wave and stimulated Brillouin backscattering process. The analytical model has been developed under Wentzel-Kramers-Brillouin and paraxial ray approximations. The nonlinearities of ponderomotive force on electron and the relativistic oscillation of the electron mass have been used in this study. The nonlinear differential equations have been set up for the beam width parameters of the main beam, ion-acoustic wave, backscattered wave and back reflectivity of stimulated Brillouin scattering (SBS). These equations have been solved numerically for different values of decentred parameter (b), relative plasma density (omega(p0)/omega(0)) and incident laser intensity (a). The results have been compared with only relativistic nonlinearity and Gaussian profile of laser beam. The focusing of laser beam, ion-acoustic wave and scattered wave are found to be strong under relativistic-ponderomotive regime compared to only relativistic regime. Further, it is observed that focusing/intensity of main laser beam, ion acoustic wave and SBS back reflectivity increases with increasing the values of b and omega(p0)/omega(0). Itis also found that back reflectivity of SBS process gets suppressed with the increase in the value of a. This study may be useful in laser induced fusion scheme where back scattering of SBS plays very important role.
机译：已经对强碰撞的高斯高斯激光束在无碰撞等离子体中的自聚焦及其对离子声波激发和受激布里渊反向散射过程的影响进行了分析和数值研究。分析模型是在Wentzel-Kramers-Brillouin和近轴射线近似下开发的。本研究使用了电子上的磁势的非线性和电子质量的相对论性振荡。针对主束的束宽参数，离子声波，背向散射波和受激布里渊散射（SBS）的背向反射率，建立了非线性微分方程。对于偏心参数（b），相对等离子体密度（omega（p0）/ omega（0））和入射激光强度（a）的不同值，这些方程已得到数值求解。仅将结果与相对论非线性和激光束的高斯分布进行了比较。与仅相对论相比，激光-离子-声势下激光束，离子声波和散射波的聚焦作用强。另外，观察到随着b和ω（p0）/ω（0）的值增加，主激光束，离子声波和SBS背反射率的聚焦/强度增加。还发现，随着a值的增加，SBS工艺的背反射率受到抑制。这项研究可能在SBS的反向散射起非常重要作用的激光诱导融合方案中很有用。

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