大预准直狭缝的铬原子束一维多普勒激光准直

Collimation of chromium beam by one-dimensional doppler laser with large collimating slit

介绍了横向尺寸为5 mm的大尺寸预准直狭缝前提下,铬原子束的一维多普勒激光准直实验,研究了激光功率和作用区域对铬原子束激光准直效果的影响.从激光驻波场中原子所受的力出发,利用适当步长的四阶Runge-Kutta算法对实验进行理论模拟.理论结果和通过Matlab程序读取的实验结果都表明在这种大尺寸的预准直狭缝前提下,经激光准直后的原子束的横向分布被压缩的同时,峰值也被大大提高.在作用区域一定时,随着激光功率的增加准直原子束的半高宽有减小的趋势,峰值有增大的趋势;激光功率一定时,随着作用区域的增加激光功率的增加准直原子束的半高宽有减小的趋势,峰值有增大的趋势.

In this paper, we present experimental study of effects of laser power and interaction length on collimation of chromium atomic beam by one-dimensional Doppler laser with large collimating slit of 5 mm in length, where the fluorescence is treated by Matlab. In addition, calculation by an adaptive step size, fourth-order Runge-Kutta type algorithm is done corresponding to the experiment. Both results show that with fixed interaction length, when the laser power becomes larger, or with fixed laser power, when the interaction length becomes longer, the FWHM of collimated atomic beam becomes smaller, and the peak becomes higher.