Patent ID: 7800803
Filing Date: 2010-09-21
Classification: G03H

Abstract:
1. A dual mode holographic printer, said dual mode holographic printer being operable in a first mode of operation for directly writing a 1-step white-light viewable hologram and in a second mode of operation for writing a master hologram (H1) that is used thereafter to produce a white-light viewable hologram (H2), said holographic printer comprising: a pulsed laser source arranged to produce a laser beam at a first wavelength, said laser beam being split into an object beam and a reference beam which is mutually coherent with said object beam; a spatial light modulator wherein, in use, said object beam illuminates said spatial light modulator; a first lens system for writing a holographic pixel of said hologram on to a photosensitive medium, said first lens system being arranged downstream of said spatial light modulator and being arranged to focus said object beam to a minimum beam waist at a Fourier plane defined by said first lens system; and positioning means for positioning said photosensitive medium at said Fourier plane in said first mode of operation and at a position downstream of said Fourier plane in said second mode of operation.