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arXiv · 0901.4856

Ultra low frequency noise laser by locking to an optical fiber delay line

Fabien Kéfélian·Haifeng Jiang·Pierre Lemonde·Giorgio Santarelli
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Abstract

We report the frequency stabilization of an erbium-doped fiber distributed-feedback laser using an all-fiber based Michelson interferometer of large arm imbalance. The interferometer uses a 1 km SMF-28 optical fiber spool and an acousto optic modulator allowing heterodyne detection. The frequency noise power spectral density is reduced by more than 40 dB for Fourier frequencies ranging from 1 Hz to 10 kHz, corresponding to a level well below 1 Hz^2/Hz over the whole range. It reaches 10^{-2} Hz^2/Hz at 1 kHz. Between 40 Hz and 30 kHz, the frequency noise is shown to be comparable to the one obtained by Pound-Drever-Hall locking to a high finesse Fabry-Perot cavity. Locking to a fiber delay line could consequently represent a reliable, simple and compact alternative to cavity stabilization for short term linewidth reduction.

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Fabien Kéfélian, Haifeng Jiang, Pierre Lemonde, Giorgio Santarelli. 2009-02-09. Ultra low frequency noise laser by locking to an optical fiber delay line. https://doi.org/10.1364/ol.34.000914

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