为了满足冷原子干涉实验对激光移频的需求、实现移频速率的精确可控,设计并实现了 一个带有操作界面的声光调制器数字驱动与控制系统。该系统由三个部分组成,分别是上位机,微处 理器控制芯片,射频信号产生芯片。其中上位机用于收集控制信息；微处理器控制芯片用于根据上位机 发送来的控制信息实现对射频信号产生芯片的控制、产生驱动声光调制器晶体的射频信号,从而实现对 实验中所需的激光进行移频。该系统可输出频率为0～150 MHz且相位噪声低至－116 dBc/Hz的射频信号,同时可 有效控制输出信号的幅度、相位和扫频速率等,该系统提供了满足冷原子干 涉实验需求的多种工作模式。

In order to meet the need of laser frequency shift and precision sweep in cold atom interferometry experiments, a control system for acousto-optic modulator with digital interface was designed and implemented. The control system consists of three components, namely upper computer (PC), microcontroller (ARM) and radio-frequency generator (DDS). Among them, PC is used to collect control information. ARM chip controls the DDS chip according to control information, so that the DDS chip can generate a RF driving signal for acousto-optic modulator, and obtain the desired laser frequency for experiments. The control system can output RF signals with frequency of 0～150 MHz and phase noise as low as －116 dBc/Hz. Meanwhile, the amplitude, phase and frequency sweep rate and other parameters of the output signals can be controlled efficiently. Additionally it offers a variety of operating modes to meet different requirements in cold atom interferometry experiments.