Patent ID: 8098701
Filing Date: 2012-01-17
Classification: B82Y,H01S

Abstract:
1. A distributed feedback quantum cascade laser element that oscillates a single-mode light, comprising: a substrate; a laminate having a stripe structure formed on a major surface of the substrate; and a diffraction grating formed on the laminate, wherein the laminate has an active layer and cladding layers formed on both sides of the active layer in a direction orthogonal to the major surface of the substrate, the cladding layer located between the active layer and the diffraction grating has a thickness within a range of 42±10% of a wavelength of oscillating light, wherein the diffraction grating is a layer including InGaAs, wherein the cladding layer located between the active layer and the substrate is made of InP, wherein the active layer is made of an InGaAs/InAlAs multiple quantum well structure, and wherein the cladding layer located between the active layer and the diffraction grating is made of InP.