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:
May. 04, 1999
Filed:
May. 07, 1997
James Nelson Baillargeon, Springfield, NJ (US);
Federico Capasso, Westfield, NJ (US);
Alfred Yi Cho, Summit, NJ (US);
Jerome Faist, Neuchatel, CH;
Claire F Gmachl, Short Hills, NJ (US);
Carlo Sirtori, Paris, FR;
Deborah Lee Sivco, Warren, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
It has been found that previously known quantum cascade (QC) lasers have a shortcoming that substantially decreases their usefulness as radiation sources for pollution monitoring and other potential applications that involve absorption measurements. Except at cryogenic temperatures, these lasers have to be driven in pulse mode and are inherently multimode. We have now established that this shortcoming can be overcome by provision of appropriate distributed feedback. Resulting lasers (QC-DFB lasers) can have single mode mid-IR output at or near room temperature, can have significant optical power, and be continuously tunable over a significant spectral region.