Patent ID: 8094696
Filing Date: 2012-01-10
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a compound semiconductor laser body having a resonator with mutually opposed front and rear facets and emitting laser light having a wavelength of at least 1250 nm; a dielectric film, selected from the group consisting of SiO a stack of a plurality of dielectric double-layer films sequentially arranged and in contact with one another, the stack of a plurality of dielectric double-layer films being disposed on and in physical contact with the dielectric film, each double-layer dielectric film having a first layer of amorphous silicon having a second refractive index, and a second layer of a material having a third refractive index that is at least 1.55 lower than the second refractive index, the first layer being closer to the dielectric film than the second layer, and having a thickness ¼ of a second in-medium wavelength determined by the second refractive index and the wavelength of the emitted light, and the second layer having a thickness ¼ of a third in-medium wavelength determined by the third refractive index and the wavelength of the laser light emitted by the compound semiconductor laser body.