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实现了一种基于数字信号处理(DSP)技术的外腔半导体激光器的自动稳频装置。该自动稳频装置以铷原子的饱和吸收谱线作为频率参考,采用调制解调技术得到稳频所需的鉴频信号。激光自动稳频装置通过模数转换器以固定的速率不间断地采集饱和吸收信号和鉴频信号,由DSP芯片对采集到的数字信号进行处理和分析。DSP芯片利用通用输入输出端口控制调制信号的开关状态,通过数模转换器控制激光频率扫描以及输出数字反馈。利用所述的激光稳频技术不仅实现了外腔半导体激光器自动稳频,而且能够实时评估激光器的锁定情况,在激光器失锁后及时重新锁定,提高了激光器的长期运行能力。最后,将使用自动稳频技术的激光器应用于空间冷原子钟原理样机地面实验中,该稳频激光可以满足相关科学实验的需求。
An automatic frequency stabilizing device for external cavity semiconductor laser based on digital signal processing (DSP) technology is realized. The automatic frequency stabilization device takes the saturated absorption line of rubidium atom as the frequency reference and adopts the modulation and demodulation technique to obtain the frequency-discriminating signal required for frequency stabilization. Laser automatic frequency stabilization device through the analog-digital converter to a fixed rate of continuous collection of saturated absorption signal and frequency signal, the DSP chip to process the collected digital signals and analysis. DSP chip uses a common input and output ports to control the switching state of the modulated signal, and controls the laser frequency sweep and output digital feedback through the digital-to-analog converter. The laser frequency stabilization technology not only realizes automatic frequency stabilization of the external cavity semiconductor laser, but also realizes the real-time evaluation of the laser locking condition, and promptly re-locks the laser after losing the lock to improve the long-term operation capability of the laser. Finally, the laser using the automatic frequency stabilization technology is applied to the ground cold space atomic clock prototype experiment, which can meet the requirements of related scientific experiments.