论文标题
在空气中空间调制高功率飞秒激光脉冲的丝和自通道的模拟
Simulations of the filamentation and self-channeling of spatially modulated high-power femtosecond laser pulses in air
论文作者
论文摘要
从理论上讲，在超跨空间相调节条件下，在空气中，高功率飞秒激光脉冲的传播在理论上被视为。数值模拟是根据时间平均电场包膜的非线性Schrodinger方程（NLSE）的降低形式进行的。初始空间调制通过交错的（TEM33）相板应用于脉冲波前分析，该相位是数值模拟的。研究了具有可变相跳动的相板后激光脉冲自我关注，丝和丝后自通道的动力学。我们表明，通过特定的相位调制，与非调节脉冲相比，空气中的脉冲细丝区域可以显着移动并伸长。此外，在空间结构辐射的丝后传播期间，形成高度定位的光通道具有增强的强度和降低的角度发散，这使距离频道后的脉冲自通道超过了雷利范围。
The propagation of high-power femtosecond laser pulses in air under conditions of superposed spatial phase modulation is considered theoretically. The numerical simulations are carried out on the basis of the reduced form of nonlinear Schrodinger equation (NLSE) for time-averaged electric field envelope. Initial spatial modulations are applied to pulse wavefront profiling by a staggered (TEM33) phase plate which is simulated numerically. The dynamics of laser pulse self-focusing, filamentation, and post-filamentation self-channeling after the phase plates with variable phase jumps is studied. We show that with specific phase modulations, the pulse filamentation region in air can be markedly shifted further and elongated compared to a non-modulated pulse. Moreover, during the post-filamentation propagation of spatially structured radiation, the highly-localized light channels are formed possessing enhanced intensity and reduced angular divergence which enables post-filamentation pulse self-channeling on the distance multiple exceeding the Rayleigh range.
