Patent ID: 6680958
Filing Date: 2004-01-20
Classification: H01S

Abstract:
A semiconductor laser device comprising:a substrate; a plurality of lasers carried on said substrate; a plurality of active layers of different compositions on said substrate corresponding to said plurality of lasers and emitting in parallel a plurality of laser lights of different oscillation wavelengths, each laser having a front surface coating film formed on a front end laser emission side of said laser in correspondence with its laser light, and each laser having a rear surface coating film formed on a rear surface of said laser in correspondence with its laser light, said rear surface coating film having a higher reflectance than that of said front surface coating film, wherein, thicknesses of said front surface and said rear surface coating films are predetermined to provide reflectances of extremal values with respect to light of a predetermined wavelength between the minimum value and the maximum value of said oscillation wavelengths.