Patent ID: 7852896

Claim:
A vertical cavity surface emitting laser comprising: a GaAs substrate; a first semiconductor distributed Bragg reflector disposed on the GaAs substrate, the first semiconductor distributed Bragg reflector including a first part and a second part on the first part; a semiconductor mesa disposed on the first semiconductor distributed Bragg reflector, the semiconductor mesa including an active layer; and a second distributed Bragg reflector on the semiconductor mesa, wherein the second part of the first semiconductor distributed Bragg reflector includes a first region and a second region surrounding the first region; the semiconductor mesa is disposed on the first region; the first part of the first semiconductor distributed Bragg reflector includes first III-V group compound semiconductor layers and second III-V group compound semiconductor layers that are alternately stacked; the second part of the first semiconductor distributed Bragg reflector includes third III-V group compound semiconductor layers and fourth III-V group compound semiconductor layers that are alternately stacked; the first III-V group compound semiconductor layers are composed of an undoped semiconductor material containing aluminum and gallium as the group III element and arsenic as the group V element; the second III-V group compound semiconductor layers are composed of an undoped semiconductor material containing gallium as the group III element and arsenic as the group V element; the third III-V group compound semiconductor layers are composed of a semiconductor material that contains indium and gallium as the group III element and phosphorus as the group V element; the fourth III-V group compound semiconductor layers are composed of a semiconductor material that contains gallium as the group III element and arsenic as the group V element; and the third III-V group compound semiconductor layers and the fourth III-V group compound semiconductor layers are doped with an n-type impurity.