Patent ID: 7742222

Claim:
A laser projection system comprising a laser source, a wavelength conversion device, and beam projection optics, wherein: the wavelength conversion device comprises an input face, and output face, and a waveguide region extending from the input face to the output face and confined between a pair of low index cladding layers; the waveguide region comprises a relatively linear waveguide portion and a pair of lateral planar waveguide portions; the output face of the wavelength conversion device comprises a multi-faceted output face comprising a core facet and at least two lateral facets; the waveguide region is structured such that an optical signal propagating from the input face to the output face along the waveguide region will define a relatively high intensity spot in substantial alignment with the relatively linear waveguide portion along the core facet of the output face and will be subject to a degree of scattering to define relatively low intensity laterally distributed parasitic light in substantial alignment with the lateral planar waveguide portions along the lateral facets of the output face; the lateral facets of the output face of the wavelength conversion device are oriented to project the relatively low intensity laterally distributed parasitic light in directions that are distinct from a direction in which the relatively high intensity spot is projected through the core facet; and the beam projection optics are structured to discriminate between the laterally distributed parasitic light and the relatively high intensity spot so as to favor projection of relatively high intensity optical signals towards an image field of the laser projection system.