Patent ID: 8189639
Filing Date: 2012-05-29
Classification: B82Y,H01S

Abstract:
1. A GaN-based edge emitting laser comprising a semi-polar GaN substrate, an active region, an N-side waveguiding layer, a P-side waveguiding layer, an N-type cladding layer, and a P-type cladding layer, wherein: the GaN substrate is characterized by a threading dislocation density on the order of approximately 1×10 the active region is interposed between and extends substantially parallel to the N-side waveguiding layer and the P-side waveguiding layer; the N-type cladding layer is interposed between the N-side waveguiding layer and the GaN substrate; the P-type cladding layer is formed over the P-side waveguiding layer; a strain-thickness product of the N-side waveguiding layer exceeds its strain relaxation critical value; a cumulative strain-thickness product of the active region calculated for growth on a relaxed N-side waveguiding layer is less than its strain relaxation critical value; an N-side interface between the N-type cladding layer and the N-side waveguiding layer comprises a set of N-side misfit dislocations; and a P-side interface between the P-type cladding layer and the P-side waveguiding layer comprises a set of P-side misfit dislocations.