Patent ID: 6956680
Filing Date: 2005-10-18
Classification: G02B,G03H

Abstract:
1. A grating structure for high dispersion volume holography, comprising: a transmission volume holographic grating produced on a reflective support, the grating including inscribed strata inclined to a plane of the support, an angle of inclination of the strata defined with respect to a normal to the support and a pitch of the strata being chosen such that a light beam of a predetermined mean wavelength, incident on the structure with a predetermined angle of incidence, (1) undergoes a first passage through the grating, (2) is reflected by the reflective support, (3) undergoes a second passage through the grating, and (4) is only diffracted by the grating during one of the first and second passages, wherein the reflective support includes a dielectric mirror or a holographic mirror with reflective support strata that are not inclined with respect to the plane of the support, the pitch of the inscribed strata is approximately 630 nm, and the angle of inclination to the normal to the support is approximately 2°.