Patent ID: 8306088
Filing Date: 2012-11-06
Classification: G02B,H01S

Abstract:
1. An optical element for receiving divergent light from a light emitting device, the light emitting device having a fast axis and a slow axis, the optical element comprising: a three-dimensional bulk of material having a Bragg grating recorded therein, the Bragg grating having a periodic arrangement of flat grating planes; wherein the bulk of material has a flat surface and the optical element has a cylindrical curved surface opposite the flat surface, wherein the grating planes are located between the flat surface and the curved surface and are arranged to reflect a first portion of divergent light from the light emitting device that is incident on the flat surface of the bulk and such that a second portion of the incident light emerges from the optical element through the cylindrical curved surface such that divergence of the incident light is reduced along the fast axis of the light-emitting device.