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. 17, 2011
Filed:
Nov. 20, 2007
Richard Maulini, Travers, CH;
Stephane Blaser, Fontaine, CH;
Jerome Faist, Zurich, CH;
Alpes Lasers SA, Neuchatel, CH;
Abstract
A quantum cascade laser amplifier () having an active zone () includes a stack of raw layers of semi-conductor materials formed in an epitaxial manner on a substrate layer () of indium. phosphide (InP) or gallium arsenide (GaAs) bearing the active zone (), and a vertical anti-reflection coating () that covers an outlet face () of the laser radiation made of materials having given refraction indices and a predetermined thickness so that the entire laser radiation can flow through the outlet face. The anti-reflection coating () includes a first layer () having a first predetermined retraction index (n) lower than the predetermined refraction index (n), and at least a second layer () having a second refraction index (n) higher than the predetermined refraction index (n), wherein the first layer () of the anti-reflection coating () is made of yttrium fluoride (YF).