Patent ID: 7203215
Filing Date: 2007-04-10
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a layer structure of a first conductive cladding layer, an active layer, and a second conductive cladding layer sequentially grown on a first conductive semiconductor substrate; and a light emitting facet from which a laser beam having a first wavelength is emitted, wherein refractive indexes of the first conductive cladding layer and the second conductive cladding layer with respect to the first wavelength are lower than an effective refractive index with respect to the first wavelength, and with respect to a light having a second wavelength incident on the light emitting facet from outside, the refractive index of at least one of the first conductive cladding layer and the second conductive cladding layer is equal to or higher than the effective refractive index with respect to the second wavelength.