A microrod optical-frequency reference in the ambient environment

Abstract

We present an ultrahigh-$Q$, solid-silica microrod resonator operated under ambient conditions that supports laser-fractional-frequency stabilization to the thermal-noise limit of $3\times 10^{-13}$ and a linewidth of 62 Hz. We characterize the technical-noise mechanisms for laser stabilization, which contribute significantly less than thermal noise. With fiber photonics, we generate optical and microwave reference signals provided by the microrod modes and the free-spectral range, respectively. Our results suggest the future physical considerations for a miniature, low noise, and robust optical-frequency source.

arXiv comment5 pages, 4 figures

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• Palm-sized, vibration-insensitive and vacuum-free all-fiber-photonic module for 10-14-level stabilization of CW lasers and frequency combs
• Ultraprecise optical-frequency stabilization with heterogeneous III-V/Si lasers
• 10${}^{-15}$-level laser stabilization down to fiber thermal noise limit using self-homodyne detection