Imaging of a vibrating object by Sideband Digital Holography
Résumé
We propose a new method for imaging vibrating objects. The frequency sidebands on the light scattered by the object, shifted by $n$ times the vibration frequency, are selectively detected by heterodyne holography, and images of the object are calculated for different sideband orders $n$. Orders up to $n=120$ have been observed, allowing the detection of amplitudes of oscillation that are much larger than the optical wavelength. We check that the signal on the sideband $n$ is proportional to $|J_n(z)|^2$, where $z$ is the modulation amplitude for the phase, and $J_n$ a Bessel function of the first kind. Using the data obtained for each value of $n$, we reconstruct the shape of vibration the object with accuracy.
Domaines
Optique [physics.optics]
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