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给出了利用全光纤环形谐振器实现对激光器频率噪声抑制的原理和实验结果。采用Pound-Drever-Hall的方法对锁定在铷原子吸收谱线上的激光进行稳频,实现了饱和吸收光谱与光纤环形谐振器双回路锁定。通过外差式马赫-曾德干涉仪来测量锁定后的激光器频率噪声发现,在频率100 Hz时,光纤环形谐振器对频率噪声的抑制度超过了40 d B。在1 Hz处,稳频激光器的频率噪声小于100 d B Hz2/Hz,其抑制度达到60 d B。
The principle and experiment results of using the all-fiber ring resonator to suppress the laser frequency noise are given. The method of Pound-Drever-Hall is used to stabilize the laser locked on the rubidium atomic absorption line, which achieves the double-loop locking between the saturated absorption spectrum and the fiber ring resonator. Measuring the locked laser frequency noise with a heterodyne Mach-Zehnder interferometer found that the fiber ring resonator suppressed the frequency noise by more than 40 days at 100 Hz. At 1 Hz, the frequency noise of a frequency stabilized laser is less than 100 d B Hz2 / Hz and its suppression reaches 60 d B.