Patent ID: 7684454
Filing Date: 2010-03-23
Classification: H01S

Abstract:
1. A vertical external cavity surface emitting laser (VECSEL) device comprising: a substrate; a bottom DBR mirror formed on the substrate; a multiple quantum well layer formed on the bottom DBR mirror and including a plurality of quantum well layers, wherein each quantum well layer comprises a pair of first strain compensation layers and a pair of second strain compensation layers, wherein said each quantum well layer is interposed between the pair of first strain compensation layers and wherein the pair of first strain layers and the quantum well layer is being interposed between the pair of second strain compensation layer to gradually relieve the strain of the quantum well layers, and wherein said first strain layers are different in composition from said second strain layers; a capping layer formed on the multiple quantum well layer; an optical pump radiating a pump beam to the surface of the capping layer; an external cavity mirror separated from and facing the bottom DBR mirror; and barrier layers respectively interposed between the quantum well layers and the first strain compensation layers, and between the first and second strain compensation layers.