自旋-轨道耦合对磁性绝缘体磁光Kerr效应的影响

采用单原子能级跃迁模型,导出在同时考虑自旋交换劈裂和自旋轨道耦合时磁光Kerr旋转的微观表达式,并就四能级跃迁情况,研究了磁光效应随原子基态及激发态能级自旋轨道耦合常数的变化规律.结果表明:磁光Kerr旋转角与自旋轨道耦合劈裂能量不成正比;单原子能级自旋轨道耦合常数为正或中间激发态自旋轨道耦合常数为负时,有利于提高磁光Kerr旋转.关键词：磁光Kerr效应自旋轨道耦合线性响应核劈裂     

减少电润湿液体透镜变焦时间的实验研究

电润湿液体透镜是通过改变液面的形状而实现变焦的,变焦时间由透镜本身和驱动电压共同决定.为了减少变焦时间,需加快液面运动的速度,而黏滞系数较大的液体透镜其液面运动速度较慢.针对这一问题,提出了一种减少变焦时间的方法,即采用过驱动电压提高液面运动速度,然后将驱动电压降至目标电压.为验证该方法的有效性,基于近轴光线的传输理论...     

Mechanism of laser-induced plasma shock wave evolution in air

A theoretical model is proposed to describe the mechanism of laser-induced plasma shock wave evolution in air. To verify the validity of the theoretical model, an optical beam deflection technique is employed to track the plasma shock wave evolution process. The theoretical model and the experimental signals are found to be in good agreement with each other. It is shown that the laser-induced plasma shock wave undergoes formation, increase and decay processes; the increase and the decay processes of the laser-induced plasma shock wave result from the overlapping of the compression wave and the rarefaction wave, respectively. In addition, the laser-induced plasma shock wave speed and pressure distributions, both a function of distance, are presented.