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首页> 外文期刊>Optics Letters >Collimated blue and infrared beams generated by two-photon excitation in Rb vapor
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Collimated blue and infrared beams generated by two-photon excitation in Rb vapor

机译：Rb蒸气中双光子激发产生的准直蓝色和红外光束

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摘要

Utilizing two-photon excitation in hot Rb vapor we demonstrate the generation of collimated optical fields at 420 and 1324 nm. Input laser beams at 780 and 776 nm enter a heated Rb vapor cell collinear and circularly polarized, driving Rb atoms to the 5D_(5/2) state. Under phase-matching conditions coherence among the 5S_(1/2) → 5P_(3/2) → 5D_(5/2) → 6P_(3/2) transitions produces a blue (420 nm) beam by four-wave mixing. We also observe a forward and backward propagating IR (1324 nm) beam, due to cascading decays through the 6S_(1/2) → 5P_(1/2) states. Power saturation of the generated beams is investigated by scaling the input powers to greater than 200 mW, resulting in a coherent blue beam of 9.1 mW power, almost an order of magnitude larger than previously achieved. We measure the dependences of both beams in relation to the Rb density, the frequency detuning between Rb ground-state hyperfine levels, and the input laser intensities.
机译：利用热Rb蒸气中的双光子激发，我们证明了在420和1324 nm处准直光场的产生。 780和776 nm处的输入激光束进入加热的共线和圆偏振的Rb蒸气室，将Rb原子驱动到5D_（5/2）状态。在相位匹配条件下，5S_（1/2）→5P_（3/2）→5D_（5/2）→6P_（3/2）过渡之间的相干通过四波混频产生蓝色（420 nm）光束。由于通过6S_（1/2）→5P_（1/2）状态的级联衰减，我们还观察到向前和向后传播的IR（1324 nm）光束。通过将输入功率缩放到大于200 mW来研究生成光束的功率饱和度，从而得到9.1 mW功率的相干蓝光束，几乎比以前的功率大一个数量级。我们测量两个光束与Rb密度，Rb基态超精细能级之间的频率失谐以及输入激光强度之间的相关性。

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