均匀展宽介质中激光超短脉冲面积的演化规律

Evolution Rule of Ultra-short Laser Pulse Area in Homogeneously Broadened Medium

用数值计算方法研究了均匀展宽二能级体系在激光超短脉冲作用下介质参量、入射脉冲面积、弛豫时间和频率失谐量对光脉冲面积演化的影响.计算结果表明,脉冲面积会在最接近输入脉冲面积2π偶数倍的值上振荡,并经过一定的传播距离后,台阶式跳跃到下一个偶数倍2π的值上振荡.

The evolution rule of the ultra-short laser pulse area which propagate through a homogeneously broadened two level system was studied. The numerical result shows that the pulse area will oscillate near the even times of 2π,and then change jumpily into the next even times of 2π after a propagation distance. The mechanism of these phenomena was analyzed particularly. In addition, by considering the medium parameter, the input pulse area, relaxation time, detune respectively, we also investigate the evolution rule of ultar-short pulse＇s propagation in a homogeneously broadened two-level atomic medium.