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Ultralow-frequency-noise stabilization of a laser by locking to an optical fiber-delay line

机译:通过锁定到光纤延迟线来实现激光器的超低频噪声稳定

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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 entire 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.
机译:我们报告了使用基于全光纤的大臂不平衡迈克尔逊干涉仪对掺-光纤分布反馈激光器的频率稳定性。干涉仪使用1 km SMF-28光纤线轴和声光调制器,可进行外差检测。对于从1 Hz到10 kHz的傅立叶频率,频率噪声功率谱密度降低了40 dB以上,对应于整个范围内低于1 Hz〜(2)/ Hz的水平;在1 kHz时达到10〜(-2)Hz〜(2)/ Hz。在40 Hz和30 kHz之间,该频率噪声与通过Pound-Drever-Hall锁定到高级Fabry-Perot腔所获得的噪声相当。因此,锁定到光纤延迟线可以代表一种可靠,简单且紧凑的替代方案,可以实现腔体稳定,以减少短期线宽。

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