Abstract
An ultralow-noise, subhertz 1.55 μm erbium-doped fiber laser that is locked on an all-fiber-based Michelson interferometer is presented in this paper. The interferometer uses 500 m SMF-28 optical fiber and an acousto-optic modulator to allow heterodyne detection. By comparing two identical laser systems, a 0.67 (0.21) Hz linewidth beat-note signal is achieved and we obtain fractional frequency instability of at short timescales (0.1–1 s). The frequency noise power spectral density of two identical lasers is below at 1 Hz and it reaches from 200 Hz to 1 kHz.
© 2015 Optical Society of America
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