Gao Xiaohui, Shim Bonggu
Opt Lett. 2019 Feb 15;44(4):827-830. doi: 10.1364/OL.44.000827.
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.
我们对强长波红外脉冲在弱电离氩气中的传播动力学进行了数值研究，结果表明，由于颤动电子引起的电子碰撞电离的横向变化，脉冲会发生自聚焦。我们在远低于克尔自聚焦临界功率的功率下演示了这种等离子体诱导的自聚焦，并发现它可以由初始电子密度和脉冲持续时间控制。
