Heterodyne temporal speckle-pattern interferometry

In temporal speckle-pattern interferometry deformation information is extra cted by a Fourier transform technique from the speckle pattern that is reco rded over a period of time as the object is deformed. A limitation of the e xperimental arrangements reported to date is that the direction of the defo rmation cannot be determined. We propose removing this limitation by using the heterodyne principle. Some experimental results that were obtained by u se of a rotating half-wave-plate frequency shifter are presented. (C) 2000 Optical Society of America OCIS codes: 120.6160, 040.2840.