Patent ID: 6351479
Filing Date: 2002-02-26
Classification: H01L,H01S

Abstract:
A semiconductor laser comprising:an n-type semiconductor substrate; an active layer formed on said n-type semiconductor substrate; and a p-type cladding layer formed on said active layer, wherein said p-type cladding layer being formed such that regions doped with a p-type dopant are formed in an order of a first lightly doped or undoped region acting as a diffusion preventing layer in a region near the active layer to prevent diffusion of the p-type dopant to the active layer, a heavily doped region acting as a carrier blocking layer to block carriers from the active layer and confine the carriers in the active layer when the semiconductor laser is in operation, and a second lightly doped region acting as a light absorption inhibiting layer to inhibit absorption of light by holes when semiconductor laser is in operation from a region closest to said active layer in a stacking direction, and wherein a maximum value of concentration of the p-type dopant exists in said heavily doped region within a range of 50 to 250 nm in the stacking direction from said active layer.