Patent ID: 7586967
Filing Date: 2009-09-08
Classification: H01S

Abstract:
1. A semiconductor layer having a double hetero mesa-stripe serving as a first semiconductor laminated product including at least a quantum well active layer formed by selective growth on a semiconductor substrate, and recombined layers serving as second semiconductor laminated products simultaneously formed on both the sides of the double hetero mesa-stripe at a predetermined interval in the selective growth, wherein when an average strain amount ε(average) and a critical strain amount ε(critical) are defined by the following equations: where the number of strained semiconductor layers is represented by j, the number of unstrained semiconductor layers sandwiched by the strained semiconductor layers is represented by k, and a strain amount of an i-th semiconductor layer and a thickness of the i-th semiconductor layer in the double hetero mesa-stripe or the recombination layers obtained by laminating n (n=j+k) semiconductor layers are represented by εi and di, respectively, where b: Strength of Burgers vector, p: Poisson's ratio α: angle between a dislocation line and its Burgers vector λ: angle between a slip direction and a direction perpendicular to cross lines of a slip surface and a laminate surface and being in the laminate surface, an average strain amount ε1(average) of the double hetero mesa-stripe is a compression strain (ε1(critical)≧ε1(average)>0, and an average strain amount ε2(average) of the recombination layer is a tensile strain (−ε2(critical)≦ε2(average)<0) not more than a critical strain amount ε2 (critical) or zero strain (ε2(average)=0).