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Critical coupling control of a microresonator by laser amplitude modulation

Chow, Jong H; Taylor, Michael A; Lam, Timothy T-Y; Knittel, Joachim; Sawtell-Rickson, Jye D; Shaddock, Daniel A; Gray, Malcolm B; McClelland, David E; Bowen, Warwick P


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.

CollectionsANU Research Publications
Date published: 2012-05-21
Type: Journal article
Source: Optics express
DOI: 10.1364/OE.20.012622


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