Patent ID: 6876002
Filing Date: 2005-04-05
Classification: H01S

Abstract:
1. A semiconductor laser element comprising on a substrate at least a first conductive type first clad layer, an active layer, a second conductive type second clad layer, a current block layer having a stripe-shaped deficient portion that extends in a direction of a resonator, a second conductive type third clad layer buried in the stripe-shaped deficient portion of the current block layer and a second conductive type protection layer provided on the third clad layer, wherein the active layer is constructed of at least a window region adjacent to its one end surface and an internal region having a quantum well structure, a peak wavelength λw of photoluminescence from the window region of the active layer has a relation of: with respect to a peak wavelength λi of photoluminescence from the internal region of the active layer, and a half-width of the photoluminescence from the window region is narrower than a half-width of the photoluminescence from the internal region.