Carl, D.D.CarlFratz, M.M.FratzPfeifer, M.M.PfeiferGiel, D.M.D.M.GielHöfler, H.H.Höfler2022-03-0413.11.20092009https://publica.fraunhofer.de/handle/publica/21956710.1364/AO.48.0000H1A novel implementation of lensless multiwavelength digital holography with autocalibration of temporal phase shifts and artificial wavelength is presented. The algorithm we used to calculate the phase shifts was previously proposed [Opt. Lett.29 183 (2004)OPLEDP0146-959210.1364/OL.29.000183] and, to our knowledge, is now used for the first time in lensless holography. Because precise knowledge of the generated artificial wavelength is crucial for absolute measurement accuracy, a simple and efficient method to determine the artificial wavelength directly is presented. The calibration method is based on a simple modification of the experimental setup and needs just one additional image acquisition per wavelength. The results of shape measurement of a metallic test object with a rough surface and steep edges are shown and the measurement accuracy is discussed.enholographydigital holographymultiplex holographyspeckle interferometrymetrologyphase measurement621535journal article