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Opt Lett. 2013 Feb 1;38(3):377-9. doi: 10.1364/OL.38.000377.

Phase-resolved heterodyne holographic vibrometry with a strobe local oscillator.

Author information

1
Laboratoire Charles Coulomb, CNRS UMR 5221, Université Montpellier II, Montpellier, France.

Abstract

We report a demonstration of phase-resolved vibrometry, in which out-of-plane sinusoidal motion is assessed by heterodyne holography. In heterodyne holography, the beam in the reference channel is an optical local oscillator (LO). It is frequency-shifted with respect to the illumination beam to enable frequency conversion within the sensor bandwidth. The proposed scheme introduces a strobe LO, where the reference beam is frequency-shifted and modulated in amplitude, to alleviate the issue of phase retrieval. The strobe LO is both tuned around the first optical modulation sideband at the vibration frequency, and modulated in amplitude to freeze selected mechanical vibration states sequentially. The phase map of the vibration can then be derived from the demodulation of successive vibration states.

PMID:
23381443
DOI:
10.1364/OL.38.000377

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