Patent ID: 7116691
Filing Date: 2006-10-03
Classification: B82Y,H01S

Abstract:
1. An edge-emitting type semiconductor laser in which a laser cavity is formed by depositing plural semiconductor layers on a crystal growth substrate, comprising: a substrate; an n-type contact layer formed on or above said substrate; an active layer formed on or above said n-type contact layer; and a concave part or cavity part formed at least a part right under said laser cavity; wherein said n-type contact layer has a thinner portion formed of at least a part right under said laser cavity and a thicker portion except for said thinner portion, and a thickness of said thinner portion is thinner than a value Λ of a function of a luminous wavelength λ, determined by the formula in which λ, n, and n eq are represented by: luminous wavelength in said active layer; refractive index of said n-type contact layer which depends on said luminous wavelength λ; and equivalent refractive index of said n-type contact layer in guided wave mode which depends on said luminous wavelength λ.