We demonstrate a self-referencing locking method for an optical frequency comb that leads to an offset-free frequency comb. It works with a standard $f-2f$ interferometer and phase-locks the carrier–envelope offset frequency to the repetition frequency. This technique uses neither an acousto-optic modulator nor difference frequency generation. No synthesizer signals are needed aside from a reference signal to stabilize the repetition rate. We test the performance by comparing it with an independent comb system; it does not result in any performance degradation when compared with the conventional phase-locking method. The offset-free comb realized by this technique may become a powerful and universal tool for use in frequency-comb-related research.

中文翻译：

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使用f-2f干涉仪的无偏移光学频率梳自参考

我们演示了一种用于光频率梳的自参考锁定方法，该方法导致了无偏移的频率梳。它符合标准$F-\mathrm{2个}F$干涉仪并将载波-包络偏移频率锁相到重复频率。该技术既不使用声光调制器也不使用差频生成。除了参考信号以外，不需要合成器信号来稳定重复率。我们通过将其与独立的梳理系统进行比较来测试其性能；与传统的锁相方法相比，它不会导致任何性能下降。通过这种技术实现的无偏移梳子可能会成为与频率梳相关的研究中使用的强大而通用的工具。