Patent ID: 7924899
Filing Date: 2011-04-12
Classification: G02B,H01S

Abstract:
1. A vertical-cavity surface-emitting laser diode (VCSEL) comprising: a first semiconductor multilayer film reflective mirror of a first conductivity type that includes a stacked structure of a high-Al refractive index layer having a high Al-composition and a low-Al refractive index layer having a lower Al-composition than the high-Al refractive index layer, an active region that includes a light emitting layer, and a second semiconductor multilayer film reflective mirror of a second conductivity type that includes a stacked structure of a high-Al refractive index layer having a high Al-composition and a low-Al refractive index layer having a lower Al-composition than the high-Al refractive index layer, on a substrate; a mesa structure or a trench structure being formed from the second semiconductor multilayer film reflective mirror to at least a portion of the first semiconductor multilayer film reflective mirror; a first to-be-oxidized Al-containing layer being formed in the first semiconductor multilayer film reflective mirror and having a higher Al-composition than the high-Al refractive index layer of the first semiconductor multilayer film reflective mirror; and a second to-be-oxidized Al-containing layer being formed in the second semiconductor multilayer film reflective mirror or between the active region and the second semiconductor multilayer film reflective mirror, and having a higher Al-composition than the high-Al refractive index layer of the second semiconductor multilayer film reflective mirror, the first to-be-oxidized Al-containing layer being formed farther from the active region than the second to-be-oxidized Al-containing layer; the first to-be-oxidized Al-containing layer having a first oxidized region oxidized from a side surface of the mesa or trench structure, and a first non-oxidized region surrounded by the first oxidized region; the second to-be-oxidized Al-containing layer having a second oxidized region oxidized from a side surface of the mesa or trench structure, and a second non-oxidized region surrounded by the second oxidized region, the size of the first non-oxidized region being larger than the maximum size of the second non-oxidized region that provides a single mode oscillation, and smaller than the maximum size of the first non-oxidized region that provides a single mode oscillation, the size of the second non-oxidized region being larger than the maximum size of the second non-oxidized region that provides a single mode oscillation, and the size of the first non-oxidized region being equal to or larger than the size of the second non-oxidized region.