Patent ID: 9042421
Filing Date: 2015-05-26
Classification: B82Y,H01S

Abstract:
1. A surface emitting laser array having a substrate and a plurality of surface emitting lasers, wherein some or all of said plurality of surface emitting lasers comprise a lower DBR minor, an active layer, an upper DBR minor and a surface relief structure stacked in this order on said substrate, said surface relief structure has a plurality of regions having predetermined optical thicknesses in a normal direction normal to said substrate, a distribution of said optical thicknesses in an in-plane direction of said substrate comprises an asymmetric distribution with respect to a central axis of a light-emitting region of said surface emitting laser, said surface relief structure has a first relief layer arranged on said upper DBR minor and a second relief layer arranged on a partial region of the first relief layer, and said distribution of said optical thicknesses of the surface relief structure in said some or all of said plurality of surface emitting lasers is configured such that lines respectively extending a direction of a centroid of respective far-field patterns (FFP) of each of said surface emitting lasers meet at a predetermined point, and wherein coordinates (x, y) indicate a position in said in-plane direction of said substrate, and the surface relief structure optical thickness di (x, y) is expressed in a light emitting region of the device i by the following expression: where Q= where D