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Optoelectronics Letters

Effect of detuning on the few-cycle laser pulse propagation in the three-level atomic medium

王蕾, 梁变 LIANG Bian, 王振东, 樊锡君

Published Jan 1, 2010• 0 citations

Abstract

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。

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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。

We have studied the spectral behaviour of few-cycle soliton pulses in a non-resonant two-level atom medium by solving the full Maxwell-Bloch equations. It is demonstrated further that the carrier effects play an important role in the propagation of the few-cycle pulse laser. When the frequency detuning is not very large, both the population distribution and the refractive index of the medium follow the oscillatory carrier field instantaneously; in this case, carrier-wave compression or carrier shock occurs and a supercontinuum broader than that in the resonant medium may be generated. When the frequency detuning is large, the carrier shock is weak and the spectrum is not continuous, only showing an odd harmonic radiation.

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。

We have studied the spectral behaviour of few-cycle soliton pulses in a non-resonant two-level atom medium by solving the full Maxwell-Bloch equations. It is demonstrated further that the carrier effects play an important role in the propagation of the few-cycle pulse laser. When the frequency detuning is not very large, both the population distribution and the refractive index of the medium follow the oscillatory carrier field instantaneously; in this case, carrier-wave compression or carrier shock occurs and a supercontinuum broader than that in the resonant medium may be generated. When the frequency detuning is large, the carrier shock is weak and the spectrum is not continuous, only showing an odd harmonic radiation.

By comparing the numerical solutions of Maxwell-Bloch equations beyond and within the slowly-varying envelope approximation and the rotating-wave approximation for the propagation of a few-cycle pulse laser in a resonant two-level atom medium, we found that both the Rabi flopping and the refractive index, and subsequently the carrier and the propagation velocity of the few-cycle pulse, are closely connected with the time-derivative behaviour of the electric field. This is because the Rabi flopping is such that the soliton pulse splits during propagation and that a shorter pulse propagates faster than a broader one.