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Chinese Physics Letters

Effect of Time-Dependent Ionization on Propagation of a Few-Cycle Circularly Polarized Laser Pulse in Two-Level Medium

张向韵, S Rộng, 陈果良, 王祖赓

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

影响多很少周期的繁殖和光谱上的光子电离循环地(椭圆形地) 在开的二水平的媒介(二水平的正连续统模型) 的极化的激光脉搏基于 Slavcheva 和赫斯建议的传统的二水平的模型被调查(Phys。加快。一 72 (2005 ) 053804 ) ，并且任意的椭圆形地极化的激光脉搏的繁殖动力学被简化为正确、左的循环地极化的激光脉搏的。当激光紧张足够高引起电离时，有重塑的脉搏上并且在更高的顺序上的电离的重要影响光谱为二水平的模型是的户外的部件，和影响与那些不同为关上的二水平的模型。

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影响多很少周期的繁殖和光谱上的光子电离循环地(椭圆形地) 在开的二水平的媒介(二水平的正连续统模型) 的极化的激光脉搏基于 Slavcheva 和赫斯建议的传统的二水平的模型被调查(Phys。加快。一 72 (2005 ) 053804 ) ，并且任意的椭圆形地极化的激光脉搏的繁殖动力学被简化为正确、左的循环地极化的激光脉搏的。当激光紧张足够高引起电离时，有重塑的脉搏上并且在更高的顺序上的电离的重要影响光谱为二水平的模型是的户外的部件，和影响与那些不同为关上的二水平的模型。
在梯子类型的很少周期激光脉搏繁殖上的 detuning 的效果三水平的原子媒介被没有慢慢地变化的信封和旋转波浪近似，从 Maxwell-Bloch 方程使用数字答案调查。结果在回声案例中显示出那，脉搏形式的明显的变化包括 carrierenvelope 阶段，脉搏持续时间，摆动振幅和频率，甚至切开的脉搏将在繁殖发生，并且产量脉搏与输入不同。在离开回声案例中，变化 detuning 能也在繁殖导致脉搏形式的可观的变化。与适当 detuning，然而， selfinduced 透明性能被认识到，并且象输入一模一样的输出脉搏能被获得。这个工作被国家基本研究程序支持了中国(号码 2006CB806000 ) ，和高度的国家重点实验室的开的资金回答激光物理，光学的上海研究所和好力学，中国。
Influence of multiphoton ionization on the propagation and spectrum of few-cycle circularly (elliptically) polarized laser pulses in an open two-level medium (two-level plus continuum model) is investigated based on the conventional two-level model proposed by Slavcheva and Hess (Phys. Rev. A 72 (2005) 053804), and the propagation dynamics of an arbitrary elliptically polarized laser pulse is reduced into that of right and left circularly polarized laser pulses. When the laser intensity is high enough to cause ionization, there are significant impacts of ionization on the pulse reshaping and on the higher order spectral components, and the impacts for the open two-level model are different from those for the closed two-level model.
The propagation of an arbitrary polarized few-cycle ultrashort laser pulse in a degenerate three-level medium is investigated by using an iterative predictor-corrector finite-difference time-domain method. It is found that the polarization evolution of the ultrashort laser pulse is dependent not only on the initial atomic coherence of the medium but also on the polarization condition of the incident laser pulse. When the initial effective area is equal to $2\ensuremath{\pi}$, complete linear-to-circular and circular-to-linear polarization conversion of few-cycle ultrashort laser pulses can be achieved due to the quantum interference effects between the two different transition paths.