Patent ID: 7542498
Filing Date: 2009-06-02
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a first conduction type semiconductor substrate; a first conduction type cladding layer formed over the substrate; an active layer formed over the first conduction type cladding layer; and a second conduction type cladding layer formed over the active layer, wherein, in view of an oscillation wavelength of the semiconductor laser device, at least four layers each of which comprises a material different from the first conduction type cladding layer are inserted in the first conduction type cladding layer, and a distance between adjacent layers inserted in the first conductive type cladding layers is less than ¼ of a vertical spot size over a range larger than the vertical spot size, wherein a layer nearest to the active layer among the layers comprising a material different from the first conductive type cladding layer is in a range of the spot size in a vertical direction, and wherein each of the at least four layers has a refractive index higher than a refractive index of the first conductor type cladding layer and located within the range of the spot size.