Patent ID: 8199788

Claim:
A surface-emission laser diode comprising: a semiconductor substrate; a cavity region formed over said semiconductor substrate, said cavity region comprising: an active layer structural part including at least one quantum well active layer producing a laser light and a barrier layer; and a spacer layer provided in a vicinity of said active layer structural part, said spacer layer comprising at least one material; an upper reflector and a lower reflector provided over said semiconductor substrate respectively at a top part and a bottom part of said cavity region, said upper reflector and said lower reflector constituting a semiconductor distributed Bragg reflector having a periodic change of refractive index and reflecting an incident light by interference of optical waves, at least a part of said semiconductor distributed Bragg reflector being formed of a layer of small refractive index of Al x Ga 1-x As (0<x≦1) and a layer of large refractive index of Al y Ga 1-y As (0≦y<x≦1), said lower reflector being formed of a first lower reflector having a low-refractive index layer of AlAs and a second lower reflector formed on said first lower reflector, said second lower reflector having a low-refractive index layer of AlGaAs, wherein a part of said spacer layer comprises (Al a Ga 1-a ) b In 1-b P (0<a≦1, 0≦b≦1), said quantum well active layer comprises Ga c In 1-c P d As 1-d (0≦c≦1, 0≦d≦1), and said barrier layer comprises Ga e In 1-e P f As 1-f (0≦e≦1, 0≦f≦1).