Patent ID: 7746914
Filing Date: 2010-06-29
Classification: G02B,H01S

Abstract:
1. A waveguide retroreflector, comprising: an optical waveguide having an end face; an optical element bonded to said optical waveguide end face, wherein the optical element is substantially free of voids and/or air spaces in a light transmitting region thereof, wherein said light transmitting region of the optical element has a length along a direction of light propagation in said region; wherein the optical element has a convex end face having a radius of curvature at an end of the light transmitting region; wherein said radius of curvature is between 80% and 120% of the length of the light transmitting region of the optical element, such that at least 5% of a light reflected from said convex end face is coupled back into the optical waveguide.