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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, a one-dimensional Doppler laser collimation experiment of chromium atomic beam under the premise of large size pre-alignment slit with lateral size of 5 mm was introduced. The effect of laser power and the action region on the collimation effect of chromium atomic laser beam was studied. The fourth-order Runge-Kutta algorithm with appropriate step length is used to simulate the experiment, starting from the force of the atoms in the laser standing wave field. The theoretical results and the experimental results read by Matlab show that in this large-sized Under the premise of collimation slit, the laser beam collimates the lateral distribution of the atom beam to be compressed, meanwhile, the peak value is also greatly increased.When the laser beam power is increased, the half-width of the beam is collimated When the laser power is constant, the FWHM of the collimated atom beam decreases with the increase of laser power, and the peak value tends to increase.