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首页> 外文期刊>Optical and quantum electronics >Generation of second harmonics of relativistically self-focused q-Gaussian laser beams in underdense plasma with axial density ramp
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Generation of second harmonics of relativistically self-focused q-Gaussian laser beams in underdense plasma with axial density ramp

机译：用轴向密度斜坡在不稳定的等离子体中产生相对自聚焦Q-Gaussian激光束的第二次谐波的产生

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摘要

An investigation on frequency doubling of intense laser beams through the phenomenon of second harmonic generation (SHG) in underdense plasmas has been presented. In order to increase the efficiency of S.H.G the density profile of plasma has been considered in the shape of upward ramp. When laser beam with frequency ω_0 propagates through plasma, it makes the plasma electrons to oscillate at pump frequency. These oscillations of plasma electrons in the presence of thermal velocity generate a plasma wave at frequency ω_0. The generated plasma wave beats with the pump beam to double its frequency. Variational theory has been adopted to find semi analytical solution of the wave equation for the slowly varying envelope of the laser beam. By using hydrodynamic fluid model of plasma, nonlinear current density for SHG has been obtained. Emphasis are put on investigation of the effect of various laser and plasma parameters on propagation dynamics of pump beam and the power of generated second harmonics.
机译：介绍了通过欠发电等离子体中的二次谐波发电（SHG）现象的强激光束频率倍增的研究。为了提高S.H.G的效率，血浆的密度曲线已被认为是向上斜坡的形状。当具有频率ω_0的激光束通过等离子体传播时，使等离子体电子以泵频率振荡。在热速度存在下的等离子体电子的这些振荡产生频率ω_0的等离子体波。产生的等离子体波与泵梁跳动到其频率的加倍。已经采用变分理论来查找激光束缓慢变化包络的波动方程的半分析解。通过使用等离子体的流体动力流体模型，已经获得了SHG的非线性电流密度。重点是调查各种激光和等离子体参数对泵浦梁传播动力学的影响及产生的第二谐波的功率。

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