Alata, R.R.AlataPARIANI, GiorgioGiorgioPARIANIZamkotsian, F.F.ZamkotsianLanzoni, P.P.LanzoniBIANCO, ANDREAANDREABIANCOBertarelli, C.C.Bertarelli2020-08-242020-08-2420171094-4087http://hdl.handle.net/20.500.12386/26786Computer Generated Holograms (CGHs) are used for wavefront shaping and complex optics testing. Present technology allows for recording binary CGHs. We propose a Digital Micro-mirror Device (DMD) as a reconfigurable mask, to record rewritable binary and grayscale CGHs on a photochromic plate. Opaque at rest, this plate becomes transparent when it is illuminated with visible light of suitable wavelength. We have successfully recorded the very first amplitude grayscale CGH, with a contrast greater than 50, which was reconstructed with a high fidelity in shape, intensity, size and location. These results reveal the high potential of this method for generating programmable/rewritable grayscale CGHs, which combine DMDs and photochromic substrates.ELETTRONICOenArticle10.1364/OE.25.0069452-s2.0-85015974769000397316200091https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-6-69452017OExpr..25.6945AFIS/05 - ASTRONOMIA E ASTROFISICA