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 1s was 6.2×1013, which is 16 times better than that of a conventional PLL laser. For an integration time of 1000s, the stability reached as high as 4.9×1015. 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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