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:
Jul. 18, 2000
Filed:
May. 01, 1998
Federico Capasso, Westfield, NJ (US);
Alfred Yi Cho, Summit, NJ (US);
Jerome Faist, Neuchatel, CH;
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 superlattice quantum cascade (SLQC) laser has undoped SL active regions, with the dopant concentration in the injector region being selected, such that, under an appropriate electrical bias, the SL active region is substantially electric field free. The absence of dopant atoms in the SL active region results in reduced carrier scattering and reduced optical losses, with consequent low threshold current and/or room temperature operation. The novel laser emits in the mid-IR spectral region and can be advantageously used in measurement or monitoring systems, e.g., in pollution monitoring systems.