Mode locking in an optomechanical cavity

Buks, Eyal; Levi, Roei; Martin, Ivar

doi:10.1209/0295-5075/129/24005

Cited by 1 publication

(1 citation statement)

References 46 publications

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“…The optical finesse in this situation is relatively low (of the order of 10), due to a lower FBG reflectivity, in comparison to the ultralow loss Bragg coated fiber tips. They designed various configurations, with the metallic beam directly fixed on the polished fiber end, inducing a passive alignment 19 – 21 , or with the light focused on the micromechanical resonator by means of a graded index lens spliced to the end facet of the fiber 22 , 23 . Bolometric self-sustained oscillations above a certain input threshold have been observed, using the heating of the metallic mirror due to optical absorption.…”

Section: Introductionmentioning

confidence: 99%

A lensed fiber Bragg grating-based membrane-in-the-middle optomechanical cavity

Baraillon

Taurel

Labeye

et al. 2022

Sci Rep

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Optomechanical systems benefit from the coupling between an optical field and mechanical vibrations. Fiber-based devices are well suited to easily exploit this interaction. We report an alternative approach of a silicon nitride membrane-in-the-middle of a high quality factor ($$10^6$$ 10 6 –$$10^7$$ 10 7 ) Fabry–Perot, formed by a grating inscribed within a fiber core as an input mirror in front of a dielectric back mirror. The Pound–Drever–Hall technique used to stabilize the laser frequency on the optical resonance frequency allows us to reduce the low frequency noise down to $${4}\,{{\mathrm{kHz}}/\sqrt{\mathrm{Hz}}}$$ 4 kHz / Hz . We present a detailed methodology for the characterization of the optical and optomechanical properties of this stabilized system, using various membrane geometries, with corresponding resonance frequencies in the range of several hundred of $${\mathrm{kHz}}$$ kHz . The excellent long-term stability is illustrated by continuous measurements of the thermomechanical noise spectrum over several days, with the laser source maintained at optical resonance. This major result makes this system an ideal candidate for optomechanical sensing.

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