CAJ | 학술논문

本文采用基于激光感生荧光(LIF)法的位移探测系统检测了铬原子束中轴向定量百分数原子数的准直发散角,定量评价了激光的多普勒冷却准直效果.实验结果得到当冷却激光功率为45mW,作用长度为24nm,失谐量为-0.5T的情况下,铬原子束中轴向定量50%原子数的准直发散角由冷却准直前的1.07±0.10mrad减小到冷却准直后的0.46±0.10mrad,并且其发散角随着冷却激光功率的增加而减小.文章最后用半经典理论数值模拟计算了实验结果并作了比较.
본문채용기우격광감생형광(LIF)법적위이탐측계통검측료락원자속중축향정량백분수원자수적준직발산각,정량평개료격광적다보륵냉각준직효과.실험결과득도당냉각격광공솔위45mW,작용장도위24nm,실해량위-0.5T적정황하,락원자속중축향정량50%원자수적준직발산각유냉각준직전적1.07±0.10mrad감소도냉각준직후적0.46±0.10mrad,병차기발산각수착냉각격광공솔적증가이감소.문장최후용반경전이론수치모의계산료실험결과병작료비교.
In this paper,a size detecting system based on Laser induced fluorescence(LIF)is designed to measure the Cr atomic beam divergence oflager collimation by sing one-dimensional transverse Doppler cooling scheme.Under the parsers of cooling laser power of 45mW,interaction distance of 24mm and detuning of-0.5Γ,we observe the angular distribution of cr atoms(50%quantile)on the beam axis is from 1.07±0.10mrad to 0.46±0.10mrad by laser collimation.We also present detailed measurements of collimation angles over different laser powers and compare and analysis our results with numerical calculation based on the semiclassical model.