铷原子四波混频中的饱和和交替通道
Saturation and alternate pathways in four-wave mixing in rubidium
摘要：
我们研究了环形腔中铷蒸气室四波混频产生的蓝光的频谱。在高原子密度和输入激光功率下，观察到由$116 \pm 4$ MHz分离的两个不同的频率分量，表明通过$6p_{3/2}$超精细态的交替四波混频通道。研究了产生的光与激发强度和原子密度的关系，表明初级过程已经饱和。当通过6p态的激发速率变得等于通过5p态的速率时，这种饱和就会产生，从而在保持二次强度依赖性的同时，不会随着原子密度而进一步增益。
英文摘要：
We have examined the frequency spectrum of the blue light generated via four-wave mixing in a rubidium vapor cell inside a ring cavity. At high atomic density and input laser power, two distinct frequency components separated by $116 \pm 4$ MHz are observed, indicating alternate four-wave mixing channels through the $6p_{3/2}$ hyperfine states. The dependence of the generated light on excitation intensity and atomic density are explored, and indicate the primary process has saturated. This saturation results when the excitation rate through the 6p state becomes equal to the rate through the 5p state, giving no further gain with atomic density while a quadratic intensity dependence remains.
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