Dual-frequency spectroscopy for compact systems and enhanced laser stabilisation
Dual-frequency spectroscopy for compact systems and enhanced laser stabilisation
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发表时间：
2021
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通讯作者：
N. Cooper;S. Madkhaly;David Johnson;D. Baldolini;Lúcia;Hackermüller
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作者：
N. Cooper;S. Madkhaly;David Johnson;D. Baldolini;Lúcia;Hackermüller
蒸气池光谱学被广泛用于稳定二极管激光器相对于特定原子跃迁的频率-这是冷原子和离子捕获实验中必不可少的技术。两个激光束，调谐到不同的频率，可以重叠在相同的空间路径作为一个援助的紧凑性，我们表明，这种方法还增强了所得到的光谱信号通过光泵浦效应，产生的光谱产生的激光稳定信号的灵敏度估计增加了3倍。无多普勒锁定功能变得可见的频率范围比标准的饱和吸收光谱宽几百MHz。在这里，我们提出了测量的无多普勒光谱信号从原子蒸气室作为两个激光频率的函数，并开发一个简单的理论模型，解释了该技术的关键特征。我们还讨论了如何使用该方法可以同时稳定两个激光器的频率，或为一个激光器提供增强的稳定性。
Vapour-cell spectroscopy is widely used for the frequency stabilisation of diode lasers relative to specific atomic transitions — a technique essential in cold atom and ion trapping experiments. Two laser beams, tuned to different frequencies, can be overlapped on the same spatial path as an aid to compactness; we show that this method also enhances the resulting spectroscopic signal via optical pumping effects, yielding an estimated increase in the sensitivity of spectroscopically-generated laser stabilisation signals by a factor of 3. Doppler-free locking features become visible over a frequency range several hundred MHz wider than for standard saturated absorption spectroscopy. Herein we present the measured Doppler-free spectroscopy signals from an atomic vapour cell as a function of both laser frequencies and develop a simple theoretical model that explains the key features of the technique. We also discuss how the method can be used to frequency-stabilise two lasers simultaneously, or to provide enhanced stabilisation for one laser.