A vertical-cavity surface-emitting laser is disclosed comprising a laser cavity sandwiched between two distributed Bragg reflectors. The laser cavity comprises a pair of spacer layers surrounding one or more active, optically emitting quantum-well layers having a bandgap in the visible which serve as...http://www.google.com/patents/US5258990?utm_source=gb-gplus-sharePatent US5258990 - Visible light surface emitting semiconductor laser
