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:
Sep. 21, 2004
Filed:
Apr. 04, 2001
Federico Capasso, Westfield, NJ (US);
Alfred Yi Cho, Summit, NJ (US);
Raffaele Colombelli, Hoboken, NJ (US);
Claire F. Gmachl, New Providence, NJ (US);
Albert Lee Hutchinson, Columbus, GA (US);
Arthur Mike Sergent, New Providence, NJ (US);
Deborah Lee Sivco, Warren, NJ (US);
Alessandro Tredicucci, Chiavari, IT;
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
The measurement of intersubband electroluminescence (ISB-EL) in unipolar quantum cascade lasers is achieved by forming a longitudinal cleave through the active region and waveguide of the QC laser device, exposing a complete side face of the device, including the active region. The conventional laser facets at the entrance and exit of the active region are coated with a highly reflective material and the emission from the exposed side face is measured. In theory, the sideface emission would comprise only the ISB-EL spontaneous emission, but some additional laser emission (due to scattering in the imperfect waveguide structure) also exits along this sideface. Spatial filtering and/or polarization monitoring can be used to differentiate the laser emission from the ISB-EL spontaneous emission.