Polarization and pressure effects in caesium 6S–8S two-photon spectroscopy
Polarization and pressure effects in caesium 6S–8S two-photon spectroscopy
复制标题
铯 6S–8S 双光子光谱中的偏振和压力效应
DOI：
10.1088/0953-4075/43/23/235003
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Hsiang‐Chen Chui
中科院分区：
文献类型：
--
作者：
Yi;Yi;Ying;Chin;Hsiang‐Chen Chui
本文分析了铯原子6S-8 S双光子光谱中的偏振效应和压力效应。偏振态的改变使谱线宽度变宽，频率发生偏移。利用一台单频钛宝石环形腔激光器、两个铯池和两个四分之一波片测量了铯6S-8 S双光子跃迁的频移和线宽展宽随激光功率的变化，并证明了线宽不能仅仅通过将数据拟合到洛伦兹形状来计算。如通过将数据拟合到Voigt轮廓所确定的，自然线宽与泵浦光束的偏振状态、激光功率和压力无关。与线偏振泵浦相比，圆偏振泵浦的铯原子6S-8 S双光子跃迁具有更窄的线宽和更小的位移。通过用圆偏振光束泵浦获得的光位移为-6.75（57）Hz（mW mm-2）-1，并且通过用线偏振光束泵浦获得的光位移为-7.25（45）Hz（mW mm-2）-1。这些结果与理论计算结果相吻合。压力偏移为−588（387）Hz mPa−1。这项工作展示了如何评估双光子跃迁与Voigt轮廓，然后帮助我们理解不同偏振态的双光子跃迁，并提高信号质量时，它们被用作频率标记。
This work analyses the effects of polarization and pressure in caesium 6S–8S two-photon spectroscopy. The linewidth was broadened and the frequency was shifted by a change of polarization states. The frequency shift and the linewidth broadening of the caesium 6S–8S two-photon transition were measured as a function of laser power using one single-frequency Ti:sapphire ring cavity laser, two caesium cells and two quarter-wave plates to ensure polarization states of light, and we showed that the linewidth cannot be evaluated just by fitting data to a Lorentzian shape. As determined by fitting the data to a Voigt profile, the natural linewidth is independent of the polarization states of the pump beams, the laser power and the pressure. Caesium 6S–8S two-photon transitions pumped by a circularly polarized beam have narrower linewidths and smaller shifts than those pumped by a linearly polarized beam. The light shift obtained by pumping with the circularly polarized beam is −6.75(57) Hz (mW mm−2)−1, and that obtained by pumping with a linearly polarized beam is −7.25(45) Hz (mW mm−2)−1. These results agree closely with theoretical calculations. The pressure shift is −588(387) Hz mPa−1. This work shows how to evaluate two-photon transitions with a Voigt profile, and then helps us to understand two-photon transitions with different polarization states, and improve the signal quality obtained when they are used as frequency markers.