Patent ID: 6697405
Filing Date: 2004-02-24
Classification: H01S

Abstract:
A surface emitting laser device for generating a laser beam, comprising:a semiconductor substrate; an active region disposed on the semiconductor substrate; a current confinement region disposed on the active region; an optical cavity comprising reflectors putting the active region and the current confinement region vertically therebetween; a first electrode disposed on the side of the semiconductor substrate relative to the current confinement region; a second electrode disposed on the side opposite to the semiconductor substrate relative to the current confinement region; and a semiconductor region having a layered structure capable of forming a channel for 2-dimensional carriers between the current confinement region and the second electrode, the semiconductor region having at least a first semiconductor layer containing impurities at a high concentration and having a wide band gap and a second semiconductor layer containing impurities at a lower concentration and having a band gap narrower than that of the first semiconductor layer.