Patent ID: 7693204

Claim:
A surface-emitting laser device, comprising: a first reflective layer formed of a semiconductor distributed Bragg reflector on a substrate; a second reflective layer formed in contact with the first reflective layer; a cavity including an active layer, the cavity being formed in contact with the second reflective layer; a third reflective layer formed in contact with the cavity; and a fourth reflective layer formed in contact with the third reflective layer, wherein the cavity is formed of an AlGaInPAs-system material; the second reflective layer includes a layered body of N first high refractive index layers and N first low refractive index layers that are alternately stacked, where N is a positive integer; the third reflective layer includes a layered body of M second high refractive index layers and M second low refractive index layers that are alternately stacked, where M is a positive integer; each of the N first low refractive index layers and the M second low refractive index layers is formed of (Al x Ga 1−x ) 0.5 In 0.5 P (0≦x≦1), each of the N first high refractive index layers and the M second high refractive index layers is formed of (Al y Ga 1−y ) 0.5 In 0.5 P (0≦y<x≦1); one of the N first low refractive index layers is in contact with the cavity, and one of the N first high refractive index layers is in contact with an AlGaAs-system material forming the first reflective layer; and one of the M second low refractive index layers is in contact with the cavity, and one of the M second high refractive index layers is in contact with an AlGaAs-system material forming the fourth reflective layer.