Abstract: A surface-emitting laser device according to an embodiment comprises: a first electrode; a substrate arranged on the first electrode; a first reflection layer arranged on the substrate; an active region arranged on the first reflection layer and including a cavity; an opening region arranged on the active region and including an aperture and an insulation region; a second reflection layer arranged on the opening region; a second electrode arranged on the second reflection layer; and a delta doping layer arranged in the opening region. The thickness of the insulation region becomes thinner in the direction of the aperture, and the delta doping layer can be arranged at the aperture.

Abstract: Provided is a white-cell type non-dispersive infrared gas sensor and more particularly, a non-dispersive infrared carbon dioxide gas sensor deposited with a hydrophobic thin film. To this end, in a carbon dioxide gas sensor for measuring a concentration of carbon dioxide included in gas, the gas sensor is a white-cell type, in the white-cell, first and second reflectors 120 and 130 are disposed to face a third reflector 140, a light source 110 is provided at one side of the third reflector 140 and a first detector 150 and a second detector 160 are provided at the other side. Further, a first hydrophobic thin film 122 may be deposited on the entire reflection surface of the first reflector 120, a second hydrophobic thin film 132 may be deposited on the entire reflection surface of the second reflector 130, and a third hydrophobic thin film 142 may be deposited on the entire reflection surface of the third reflector 140.