Patent ID: 7792170
Filing Date: 2010-09-07
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser having an oscillation wavelength λ (nm) and comprising at least a substrate, a first-conduction-type clad layer having an average refractive index N 1cld , an active layer structure having an average refractive index N A , a second-conduction-type clad layer having an average refractive index N 2cld , wherein a first-conduction-type subwaveguide layer having an average refractive index N a first-conduction-type low-refractive-index layer having an average refractive index N these refractive indexes satisfy all the following formulae: wherein the first-conduction-type subwaveguide layer is configured such that, when an input current is increased, a red-shift of the longitudinal-mode due to a red-shift of the gain spectrum in the active layer structure is inhibited by the plasma effect of reducing the refractive index of the subwaveguide layer.