title: Programmable CGH on photochromic plates coded with DMD generated masks.
abstract: Computer 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.
authors.forename: R
authors.initials: R
authors.lastname: Alata
authors.forename: G
authors.initials: G
authors.lastname: Pariani
authors.forename: F
authors.initials: F
authors.lastname: Zamkotsian
authors.forename: P
authors.initials: P
authors.lastname: Lanzoni
authors.forename: A
authors.initials: A
authors.lastname: Bianco
authors.forename: C
authors.initials: C
authors.lastname: Bertarelli