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:
Oct. 24, 2000
Filed:
Jun. 12, 1998
James Nelson Baillargeon, Springfield, NJ (US);
Federico Capasso, Westfield, NJ (US);
Alfred Yi Cho, Summit, NJ (US);
Claire F Gmachl, Short Hills, NJ (US);
Albert Lee Hutchinson, Piscataway, NJ (US);
Deborah Lee Sivco, Warren, NJ (US);
Alessandro Tredicucci, Summit, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A novel quantum cascade (QC) laser comprises a multiplicity of identical repeat units, with each repeat unit comprising an active region and an injector region. The injector region comprises quantum wells and barriers, selected to facilitate, under appropriate bias, resonant carrier transport from a lower energy level of a given active region to an upper energy level of an adjacent downstream active region. Carrier transition from the upper energy level to a lower energy level of an active region results in emission of infrared radiation. The laser is advantageously used in, e.g., a measurement system for detection of trace compounds in air.