Patent ID: 8891572
Filing Date: 2014-11-18
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor laser chip having an emission surface and a reflection surface which are opposing end surfaces of a resonator, the semiconductor laser chip including an active layer having a structure in which an In a photodiode for detecting light that exits from the reflection surface side, the photodiode having a sensitivity which rises as a wavelength of the exiting light lengthens in a range from 300 nm to 500 nm, wherein the emission surface has a first dielectric multilayer film formed thereon and the reflection surface has a second dielectric multilayer film formed thereon, and wherein the semiconductor laser chip has an oscillation wavelength λ wherein the first dielectric multilayer film on the emission surface has a reflectance property which peaks at λ wherein the second dielectric multilayer film on the reflection surface has a reflectance property which peaks at λ