Speckle Interferometry and Speckle Holography; Techniques and Limitations

Abstract We discuss speckle interferometry and speckle holography measurements of double and triple stars. Speckle holography with the ESO 3.6m telescope yielded direct images with a resolution of 0.03 arc second (diffraction limit). Finally we discuss the speckle rotation method, which can be used to reconstruct high-resolution images from Space Telescope data.