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Sideband holography can be used to get fields images (E0 and E1) of avibrating object for both the carrier (E0) and the sideband (E1) frequency withrespect to vibration. We propose here to record E0 and E1 sequentially, and toimage the correlation E1E * 0 . We show that this correlation is insensitivethe phase related to the object roughness and directly reflect the phase of themechanical motion. The signal to noise can be improved by averaging thecorrelation over neighbor pixel. Experimental validation is made with vibratingcube of wood and with a clarinet reed. At 2 kHz, vibrations of amplitude downto 0.01 nm are detected.

Vibration of low amplitude imaged in amplitude and phase by sideband versus carrier correlation digital holography