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Automatic mode-matching of a Fabry-Perot cavity with a single photodiode and spatial light modulation

Ralph, Tarquin; Altin, Paul; Rabeling, David; McClelland, David; Shaddock, Daniel

Description

Conventional cavity alignment sensing uses multi-element photodiodes to sense the matching of a laser beam to the mode of a cavity. We present a new approach that uses a single-element photodiode combined with deformable mirrors to modulate orthogonal codes across distinct spatial regions of the laser wavefront. By decoding the photodiode signal it is possible to map the mode mismatch and produce error signals for feedback to the mirrors to optimize the coupling of the laser to the cavity. We...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
URI: http://hdl.handle.net/1885/274325
Source: Journal of Optics
DOI: 10.1088/2040-8986/abb3a8

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