Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Opt Lett. 2010 Nov 15;35(22):3853-5. doi: 10.1364/OL.35.003853.
We propose a modulation-free technique for frequency stabilization of an external-cavity diode laser (ECDL) by using a phase-difference biased Sagnac interferometer to produce dispersion spectroscopic error signals. A half-wave plate and a total internal reflection prism are inserted into the loop to provide a phase-difference bias between the clockwise and counterclockwise beams with perpendicular polarizations, instead of the previous method with misaligned optical paths. In the experiments, the frequency of the Littman-Metcalf configuration ECDL is locked at the transition of the Rb atomic vapor, and the frequency fluctuation is suppressed from 8 to less than 0.5 MHz peak to peak. It is shown that this scheme is simple, robust, low cost, and it shows promise for use in a variety of related applications.
我们提出了一种调制自由的技术，用于通过使用相差偏置萨格纳克干涉仪产生色散光谱误差信号来稳定外部腔二极管激光器（ECDL）的频率。在环路中插入半波片和全内反射棱镜，在具有垂直偏振的顺时针和逆时针光束之间提供相差偏置，而不是以前的方法中使用的光路未对准。在实验中，将里特曼-迈特卡尔夫配置的 ECDL 的频率锁定在铷原子蒸气的跃迁上，并且将频率波动从 8 抑制到小于 0.5 MHz 峰峰值。结果表明，该方案简单、鲁棒、低成本，并且在各种相关应用中具有应用前景。
