100个TW飞秒Laser脉冲在厘米级低密度等离子体中的自导引
Self-guiding of 100 TW Femtosecond Laser Pulses in Centimeter-scale Underdense Plasma
摘要：
利用高功率超短脉冲激光与欠稠密等离子体相互作用，进行了激光自导引的实验研究。当激光脉冲功率远高于相对论自聚焦的临界功率时，观察到极长等离子体通道的形成及其弯曲。长的自导引通道的形成伴随着电子加速，具有低的横向发射度和高的电流。粒子模拟表明，当加速电子超过激光脉冲并改变激光脉冲前面区域的折射率时，激光弯曲发生。
英文摘要：
An experiment for studying laser self-guiding has been carried out for the high power ultrashort pulse laser interaction with an underdense plasma slab. Formation of an extremely long plasma channel and its bending are observed when the laser pulse power is much higher than the critical power for relativistic self-focusing. The long self-guiding channel formation is accompanied by electron acceleration with a low transverse emittance and high electric current. Particle-in-cell simulations show that laser bending occurs when the accelerated electrons overtake the laser pulse and modify the refractive index in the region in front of the laser pulse.
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