We report on a compact and robust self-referenced optical frequency comb with a tunable repetition rate, generated by an all-polarization-maintaining (PM) mode-locked Er-doped fiber laser. The spacing between comb teeth can be tuned above 300 kHz at a repetition rate of 101 MHz. The repetition rate and the carrier–envelope offset of the laser are stabilized separately, and the relative residual phase noises are determined to be $336~\unicode[STIX]{x03BC}\text{rad}$ and 713 mrad (1 Hz–1 MHz). The accurate frequency characteristics and the stable structure show great potential for the use of such a comb in applications of precision measurements.

中文翻译：

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来自紧凑而坚固的 Er: 光纤激光器的可调谐光学频率梳

我们报告了由全保偏 (PM) 锁模掺铒光纤激光器产生的具有可调谐重复率的紧凑且坚固的自参考光学频率梳。梳齿之间的间距可以在 101 MHz 的重复频率下调整到 300 kHz 以上。分别稳定激光器的重复频率和载波包络偏移，确定相对残余相位噪声为 $336~\unicode[STIX]{x03BC}\text{rad}$ 和 713 mrad (1 Hz–1 MHz)。准确的频率特性和稳定的结构显示了这种梳子在精密测量应用中的巨大潜力。