title: Regeneratively mode-locked fiber laser with a repetition rate stability of 4.9x10-15 using a hydrogen maser phase-locked loop.
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 6.2x10(-13), which is 16 times better than that of a conventional PLL laser. For an integration time of 1000s, the stability reached as high as 4.9x10(-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.
authors.affiliation: 1Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577 Japan. masato@riec.tohoku.ac.jp
authors.forename: Masato
authors.initials: M
authors.lastname: Yoshida
authors.forename: Toru
authors.initials: T
authors.lastname: Hirayama
authors.forename: Masataka
authors.initials: M
authors.lastname: Nakazawa
authors.forename: Ken
authors.initials: K
authors.lastname: Hagimoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ikegami