通过光调制抑制重吸收
Suppression of Reabsorption via Modulation of Light
摘要：
再吸收，即自发发射光子在光学厚气体中的多次散射，是超冷气体中有效光泵浦和激光冷却的主要限制。我们报告减轻再吸收使用空间和频率调制的激光照射这样的气体。我们开发了一个半经典模型，成功地描述了频率调制光时的重吸收过程。为了重现我们的实验结果，有必要将模型中的处理扩展到简单的两原子图像之外。
英文摘要：
Reabsorption, the multiple scattering of spontaneously emitted photons in optically thick gases, is a major limitation to efficient optical pumping and laser cooling in ultracold gases. We report mitigation of reabsorption using spatial and frequency modulation of laser light illuminating such gases. We developed a semi-classical model that successfully describes the reabsorption process when frequency-modulated light is present. It was necessary to extend the treatment in the model beyond a simple two-atom picture in order to reproduce our experimental results.
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