The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 1993
Filed:
Mar. 27, 1992
Jacques I Pankove, Boulder, CO (US);
The University of Colorado Foundation, Inc., Boulder, CO (US);
Abstract
A surface emitting semiconductor laser includes a body of a semiconductor material having a pair of opposed surfaces and a plurality of active regions stacked one on the other between the surfaces. Each of the active regions includes a p-type conductivity layer, an n-type conductivity layer and an active layer therebetween. The active layer can either be intrinsic or a quantum well. The p-type and n-type layers are doped to provide a tunneling junction between the layers of adjacent active regions. The active layers of the active regions are spaced apart a multiple of one-half a wavelength to provide distributed feedback. Contacts are on the surfaces of the body with one of the contacts having an opening therethrough through which a generated light beam can emerge.