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Opt Lett. 2009 Dec 1;34(23):3698-700. doi: 10.1364/OL.34.003698.

Fringe-free holographic measurements of large-amplitude vibrations.

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  • 1Laboratoire Kastler-Brossel, UMR 8552 CNRS, Ecole Normale Supérieure, Université Paris 6, 24 rue Lhomond 75231 Paris Cedex 05, France.


In the measurement of the amplitude of vibration of objects, holographic imaging techniques usually involve fringe counting; because of the limited resolution of the images, measurements of large amplitudes are not accessible. We demonstrate a technique that suppresses the necessity of fringe counting--frequency sideband imaging--where the order of the sideband is considered a marker of the amplitude. The measurement is completely local: no comparison with another reference point on the object is necessary. It involves a sharp variation of a signal, which makes it robust against perturbations. The method is demonstrated in an experiment made with a vibrating clarinet reed; phase modulations as large as 1000 rad have been measured.

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