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Stable optical phase modulation with micromirrors

We measure the motional fluctuations of a micromechanical mirror using a Michelson interferometer, and demonstrate its interferometric stability. The position stability of the micromirror is dominated by the thermal mechanical noise of the structure. With this level of stability, we utilize the micr...

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Published in:Optics express 2012-01, Vol.20 (3), p.3261-3267
Main Authors: Knoernschild, Caleb, Kim, Taehyun, Maunz, Peter, Crain, Stephen G, Kim, Jungsang
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Language:English
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description We measure the motional fluctuations of a micromechanical mirror using a Michelson interferometer, and demonstrate its interferometric stability. The position stability of the micromirror is dominated by the thermal mechanical noise of the structure. With this level of stability, we utilize the micromirror to realize an optical phase modulator by simply reflecting light off the mirror and modulating its position. The resonant frequency of the modulator can be tuned by applying a voltage between the mirror and an underlying electrode. Full modulation depth of ±π is achieved when the mirror resonantly excited with a sinusoidal voltage at an amplitude of 11 V.
doi_str_mv 10.1364/OE.20.003261
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subjects Equipment Design
Equipment Failure Analysis
Interferometry - instrumentation
Lenses
Micro-Electrical-Mechanical Systems - instrumentation
Miniaturization
Telecommunications - instrumentation
title Stable optical phase modulation with micromirrors
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