Abstract

We demonstrate an ultrastable regeneratively mode-locked fiber laser that employs a phase-locked loop (PLL) circuit with a hydrogen maser. The stability for an integration time of $1\mathrm{s}$ was $6.2\times {10}^{-13}$, which is 16 times better than that of a conventional PLL laser. For an integration time of $1000\mathrm{s}$, the stability reached as high as $4.9\times {10}^{-15}$. The repetition-rate stability was limited by the synthesizer used for the PLL operation, and there was no additional fluctuation induced by the laser operation.

© 2007 Optical Society of America

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