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窄线宽激光器在铯原子喷泉钟、光钟以及时间频率传递等方面有着重要的作用。主要介绍中国科学院国家授时中心开展的工作波长为698 nm窄线宽激光器的研究进展。实验中采用两级稳频方法将激光锁到初稳腔和高稳腔。通过第一级稳频,激光线宽为1.1 kHz;目前已初步实现了第二级稳频。通过逐渐优化第二级稳频,可以实现Hz量级线宽激光。
Narrow linewidth lasers in the cesium atomic fountain clock, light clock and time-frequency transfer has an important role. This paper mainly introduces the research progress of narrow-line laser with a wavelength of 698 nm carried out by National Time Center of Chinese Academy of Sciences. In the experiment, two-stage frequency stabilization method was used to lock the laser to the initial stable cavity and the high stable cavity. Through the first stage of frequency stabilization, laser linewidth of 1.1 kHz; has initially achieved the second level frequency stabilization. By gradually optimizing the second level of frequency stabilization, it is possible to achieve Hz-level linewidth lasers.