Patent ID: 6510263
Filing Date: 2003-01-21
Classification: G01N,G02B

Abstract:
A process for producing a waveguide plate having a plate-like glass substrate carrying a waveguide layer with at least one coupling grating, comprising the steps of:forming a phase mask comprising a transparent region with a diffraction grating and masking parts of said diffraction grating; covering the glass substrate with a photoresist layer; arranging the glass substrate in proximity to the phase mask with said photo resist layer facing said phase mask; exposing said phase mask at an angle which deviates from a Littrow angle (&thgr;L) or from a right angle by not more than 10Â°; developing the photoresist layer; subjecting the glass substrate to an etch process for producing said at least one coupling grating; removing said photo resist layer; and applying the waveguide layer.