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应用多光子非线性Compton散射模型、空间动态补偿模型、非线性薛定谔方程和数值模拟方法,研究了Compton散射对超强飞秒激光等离子体中通道的影响,提出了将Compton散射光作为形成等离子体通道的新机制,给出了超强飞秒激光脉冲在等离子体中传播和电子密度随时间变化的非线性修正方程,并进行了数值模拟.研究发现:散射使等离子体中电子密度峰值增大1个量级,半径增大1 mm.激光最大功率密度被限制在10~(18)W/m~2以下,随传输距离增大缓慢衰减.传输初始阶段,单脉冲衰减能量较散射前增大2%,之后衰减较平缓.通过增加超强飞秒激光脉冲输入功率,能有效地增加电子密度峰值,有利于等离子体通道的形成.并对所的结论给出了初步物理解释.
The effects of Compton scattering on the channels in the super femtosecond laser plasma were studied by using the multi-photon non-linear Compton scattering model, the spatial dynamic compensation model, the nonlinear Schrödinger equation and the numerical simulation method. We proposed the Compton scattered light as the plasma Channel, a new nonlinear modification equation of the propagation and electron density of super femtosecond laser pulse in plasma is given and the numerical simulation is carried out. The results show that scattering increases the peak value of electron density in the plasma 1 order of magnitude, the radius increases 1 mm. The maximum laser power density is limited to 10 ~ (18) W / m ~ 2 below, with the transmission distance increased slowly decay.Transmission initial stage, single pulse attenuation energy than before scattering 2%, and then the attenuation is gentle. By increasing the input power of super femtosecond laser pulses, the peak of electron density can be effectively increased, which is in favor of the formation of plasma channels. The preliminary physical explanation of the conclusion is also given.