Imaging a vibrating object by Sideband

2009 
We obtain quantitative measurements of the oscillation amplitude of vibrating objects by using sideband digital holography. The frequency sidebands on the light scattered by the object, shifted by n times the vibration frequency, are selectively detected by heter odyne holography, and images of the object are calculated for different orders n. Orders up to n = 120 have been observed, allowing the measurement of amplitudes of oscillation that are significantly larger than the optical w avelength. Using the positions of the zeros of intensity for each value of n, we reconstruct the shape of vibration the object.
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