Abstract
Sideband holography can be used to get field images ( and ) of a vibrating object for both the carrier () and the sideband () frequency with respect to vibration. Here we propose to record and sequentially and to image the product or the correlation . We show that these quantities are insensitive to the phase related to the object roughness and directly reflect the phase of the mechanical motion. The signal to noise can be improved by averaging over a neighbor pixel, yielding . Experimental validation is made with a vibrating cube of wood and a clarinet reed. At 2 kHz, vibrations of amplitude down to 0.01 nm are detected.
© 2015 Optical Society of America
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