冷原子高场成像的Laser频偏锁定方案
Laser frequency offset locking scheme for high-field imaging of cold atoms
摘要：
我们提出了一种简单而灵活的频率偏移锁定方案，该方案仅依赖于商业上可用的RF电子器件，用于超冷原子的高场成像。主要的新成分是使用自制的RF滤波器的尖锐幅度响应来提供用于锁定激光器的误差信号。我们能够在200 MHz的捕获范围内偏移锁定两个独立的二极管激光器，调谐范围高达1.4GHz。对于几百秒的积分时间，偏置锁定激光器的拍音剩余波动低于2MHz。
英文摘要：
We present a simple and flexible frequency offset locking scheme developed for high-field imaging of ultra-cold atoms which relies on commercially available RF electronics only. The main new ingredient is the use of the sharp amplitude response of a home-made RF filter to provide an error signal for locking the lasers. We were able to offset lock two independent diode lasers within a capture range of 200 MHz, and with a tuning range of up to 1.4GHz. The beat-note residual fluctuations for offset locked lasers are below 2MHz for integration times of several hundreds of seconds.
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