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中文摘要：
为满足新一代时间频率系统中锶原子光钟的研制任务的需求,研制了698 nm超稳激光系统。基于PDH激光稳频技术,将激光频率锁定在高精细度光学参考腔共振频率上,通过PID负反馈控制系统实现对激光频率的纠正,从而提高激光的频率稳定度。两套独立激光系统的拍频比对结果显示,单套激光系统的频率稳定度约2.5×10^-15/s,线宽是2 Hz。
英文摘要：
An ultra-stable laser system at 698 nm as local oscillator for strontium lattice clocks is developed for a new generation of time and frequency system. The output frequency of lasers is locked to a resonance of a rigid Fabry-Perot cavity with a high finesse based on the Pound-Drever-Hall technique. The fractional frequency stability is improved via the PID feedback control system correcting of laser frequency. The beat-note measurements between two independent frequency stabilized lasers show that the fractional frequency stability of one laser is about 2.5×10^-15 with 1 s averaging time and the linwidth is 2 Hz.
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