Patent ID: 6327293
Filing Date: 2001-12-04
Classification: H01S

Abstract:
A semiconductor laser, comprising:a first mirror;a semiconductor multilayer epitaxially-grown quantum-well structure on said first mirror, said quantum-well structure having an output-window layer defined as the epitaxially-grown layer furthest from said first mirror;said quantum-well structure including a plurality of quantum-well groups said quantum well groups superposed one on the other and each of said quantum-well groups having a compressively stressed quantum-well layer of InGaAs having a composition selected to emit laser radiation at a predetermined wavelength, a spacer layer group and a barrier layer of GaAs between said spacer layer group, said quantum-well layer, and the layer thicknesses in said quantum-well structure being selected such that each quantum-well layer therein is about at an antinode of a standing-wave generated in the structure when the laser is operational, with consecutive ones of said guantum-well layers optically spaced apart by about one-half of said laser-emission wavelength;said spacer layer group including alternatively (a) a layer of In.sub.x Ga.sub.(1-x) As.sub.y P.sub.(1-y) having a tensile strain or (b) a layer of GaAs and a tensile stressed layer of GaAs.sub.u P.sub.(1-u) where u is about 0.9;a second mirror facing said output-window layer and spaced apart therefrom, thereby defining a gap between said second mirror and said output-window layer, said first and second mirrors defining a resonant cavity therebetween of length L; andat least one source of pump-radiation for optically pumping said quantum-well structure, said pump-radiation source arranged to direct said pump-radiation into said quantum-well structure via said output-window layer thereof.