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Generation of terahertz radiation from beating of two intense cosh-Gaussian laser beams in magnetized plasma
Laser and Particle Beams ( IF 0.9 ) Pub Date : 2019-10-14 , DOI: 10.1017/s0263034619000685 Gunjan Purohit , Vinod Rawat , Priyanka Rawat
Laser and Particle Beams ( IF 0.9 ) Pub Date : 2019-10-14 , DOI: 10.1017/s0263034619000685 Gunjan Purohit , Vinod Rawat , Priyanka Rawat
An analytical and numerical study has been carried out for the generation of terahertz (THz) radiation by beating of two intense cosh-Gaussian laser beams (decentered Gaussian beams) in the rippled density magnetized plasma under the relativistic–ponderomotive regime. In this process, both laser beams exert a relativistic–ponderomotive force on plasma electrons at the beat frequency and impart them an oscillatory velocity in the presence of a static magnetic field. Due to coupling between this nonlinear oscillatory velocity with density ripple, nonlinear current is generated that excites the THz radiation at the different frequency. Higher-order paraxial-ray approximation (non-paraxial theory) has been used in this study. The effects of the decentered parameter, magnetic field, and density ripple on the THz radiation generation in ripple density magnetized plasma have been investigated. Further, the effect of beating of laser beams on the THz field amplitude and the efficiency of THz radiation have been studied. The amplitude and efficiency of the emitted radiation are found to be highly sensitive to the decentered parameter, magnetic field, and density ripple. It has been found that the amplitude and efficiency of the generated THz radiation increase significantly with increasing the values of decentered parameter, magnetic field, and density ripple.
中文翻译:
磁化等离子体中两束强同高斯激光束的搏动产生太赫兹辐射
通过在相对论-有动力机制下波纹密度磁化等离子体中的两束强同心高斯激光束(偏心高斯光束)的搏动,对太赫兹 (THz) 辐射的产生进行了分析和数值研究。在这个过程中,两束激光束都以拍频对等离子体电子施加相对论动力,并在存在静磁场的情况下赋予它们振荡速度。由于这种非线性振荡速度与密度纹波之间的耦合,会产生非线性电流,激发不同频率的太赫兹辐射。本研究中使用了高阶近轴射线近似(非近轴理论)。偏心参数的影响,磁场,已经研究了纹波密度磁化等离子体中太赫兹辐射产生的密度纹波。此外,还研究了激光束跳动对太赫兹场振幅和太赫兹辐射效率的影响。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。
更新日期:2019-10-14
中文翻译:
磁化等离子体中两束强同高斯激光束的搏动产生太赫兹辐射
通过在相对论-有动力机制下波纹密度磁化等离子体中的两束强同心高斯激光束(偏心高斯光束)的搏动,对太赫兹 (THz) 辐射的产生进行了分析和数值研究。在这个过程中,两束激光束都以拍频对等离子体电子施加相对论动力,并在存在静磁场的情况下赋予它们振荡速度。由于这种非线性振荡速度与密度纹波之间的耦合,会产生非线性电流,激发不同频率的太赫兹辐射。本研究中使用了高阶近轴射线近似(非近轴理论)。偏心参数的影响,磁场,已经研究了纹波密度磁化等离子体中太赫兹辐射产生的密度纹波。此外,还研究了激光束跳动对太赫兹场振幅和太赫兹辐射效率的影响。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。发现发射辐射的幅度和效率对偏心参数、磁场和密度纹波高度敏感。已经发现,随着偏心参数、磁场和密度纹波的值的增加,所产生的太赫兹辐射的幅度和效率显着增加。