We numerically investigate the propagation dynamics of intense long-wavelength infrared pulses in a weakly ionized argon gas and show that the pulses undergo self-focusing due to the transverse variations of electron-impact ionization caused by quivering electrons. We demonstrate this plasma-induced self-focusing at a power much lower than the critical power for Kerr self-focusing, and find that it can be controlled by the initial electron density and pulse duration.

中文翻译：

---

碰撞电离介导的气体中长波长红外脉冲的自聚焦

我们数值研究了强弱电离的氩气中长波长红外脉冲的传播动力学，结果表明，由于电子颤动引起的电子碰撞电离的横向变化，脉冲经历了自聚焦。我们展示了这种等离子体感应的自聚焦，其功率远低于Kerr自聚焦的临界功率，并且发现它可以由初始电子密度和脉冲持续时间控制。