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基于冷原子实验对激光器的频率稳定性有很高的要求,设计了一套基于原子蒸气饱和吸收法的激光稳频系统。该激光稳频系统有较高的集成度,射频(RF)调制信号的产生、放大、滤波、混频以及误差信号的检出电路被集成到了一块3U的插件上,用于寻找光谱的扫描电路和锁频控制器(PI)集成到了另一块3U插件上。专门设计了一个14槽,19英寸(482.6 mm)宽的3U机箱来安放这些插件。这种高集成度的方式,不仅具有占用空间少、易于管理和维护等优点,其抗干扰能力也大大提高。采用高达21.4 MHz的调制信号,避开了低频的干扰,并使误差信号能反应出激光管更快速的相位抖动。
Based on cold atomic experiments, the laser frequency stability is very high, and a laser frequency stabilization system based on atomic vapor saturation absorption is designed. The laser frequency stabilization system has a high degree of integration, RF modulation signal generation, amplification, filtering, mixing and error signal detection circuit is integrated into a 3U plug-in for scanning the spectrum looking for the circuit And frequency lock controller (PI) integrated into another 3U plug-in. A 14-slot, 19-inch (482.6 mm) wide 3U chassis has been specially designed to accommodate these plug-ins. This highly integrated approach not only has the advantages of less occupied space, easy management and maintenance, but also greatly improves its anti-interference ability. Modulating signals up to 21.4 MHz avoids low-frequency interference and enables error signals to reflect faster laser phase jitter.