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  • Title: Critical coupling control of a microresonator by laser amplitude modulation.
    Author: Chow JH, Taylor MA, Lam TT, Knittel J, Sawtell-Rickson JD, Shaddock DA, Gray MB, McClelland DE, Bowen WP.
    Journal: Opt Express; 2012 May 21; 20(11):12622-30. PubMed ID: 22714249.
    Abstract:
    We present a laser amplitude modulation technique to actively stabilize the critical coupling of a microresonator by controlling the evanescent coupling gap from an optical fiber taper. It is a form of nulled lock-in detection, which decouples laser intensity fluctuations from the critical coupling measurement. We achieved a stabilization bandwidth of ∼ 20 Hz, with up to 5 orders of magnitude displacement noise suppression at 10 mHz, and an inferred gap stability of better than a picometer/√Hz.
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