摘要
计算和测量了Cs-Ar混合蒸气中Cs(6P3/2)共振能级的有效辐射率。使用单模半导体激光器(泵浦激光)将Cs原子激发至6P3/2态,另一调谐到6P3/2→8S1/2的单模激光束(检测激光)与泵浦束反平行通过样品池,并在池的直径方向平行移动,通过对检测激光束的吸收测定了激发态原子密度及其空间分布。由于辐射陷获存在,有效辐射率是自然辐射率与透射因子(发射的光子在探测区域内没有被吸收的平均概率)的乘积。6P3/2原子密度及其空间分布结合6P3/2←6S1/2跃迁线的碰撞增宽计算了透射因子,从而得到了不同Ar气压下,Cs D2线的有效辐射率。从6P3/2→6S1/2跃迁线强度I852的测量,得到了不同Ar气压下有效辐射率的比值与理论计算得到的比值相符。
The effective radiative rate for Cs （6P3/2） resonance level in the presence of Ar is determined. Cs atoms were excited to the 6P3/2 state using a single - mede diede laser （pump laser）. The excited - atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single - mede diede laser beam （probe laser）, tuned to the 6P3/2→8S1/2 transition which could be translated parallel to the pump beam. In the presence of radiation trapping, the spontaneous radiation rate is multiplied by the transmission factor T6P3/2→6S1/2 , which describes the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed. Position dependent 6P3/2 state densities had been combined with the collisional broadening rate 6P3/2←6S1/2 line due to both Ar and cesium perturbers to yield the T6P3/2→6S1/2 .The effective radiative rates of the Cs D2 line as a function of the Ar pressure PAr were obtained. The fluorescence intensity I852 of the T6P3/2→6S1/2 emission was measured simultaneously. The measured fluorescence ratios determined the ratios of the effective radiative rates at different Ar density. These ratios are in agreement with theoretical evaluation.
出处
《激光杂志》
CAS
CSCD
北大核心
2008年第3期15-16,共2页
Laser Journal
基金
国家自然科学基金资助项目10664003
关键词
激光光谱
有效辐射率
辐射陷获
压力增宽
Cs-Ar混合蒸气
laser spectroscopy
effective radiative rate
radiation trapping
pressure broadening
Cs - Ar mixture
