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:
Dec. 25, 2007
Filed:
Dec. 23, 2004
Nuditha Vibhavie Amarasinghe, Richardson, TX (US);
Taha Masood, Plano, TX (US);
Steven Gregory Patterson, Plano, TX (US);
Gary Alan Evans, Plano, TX (US);
Nuditha Vibhavie Amarasinghe, Richardson, TX (US);
Taha Masood, Plano, TX (US);
Steven Gregory Patterson, Plano, TX (US);
Gary Alan Evans, Plano, TX (US);
Photodigm, Inc., Richardson, TX (US);
Abstract
An improved grating-outcoupled surface-emitting semiconductor laser architecture is provided. A second-order grating is placed between two distributed Bragg reflector gratings. The period of the second order grating is positively or negatively detuned from the distributed Bragg reflector selected optical wavelength at which the laser operates. Detuning of the second-order grating towards shorter or longer wavelengths allows kink-free, linear LI curves light output versus forward current) for grating-outcoupled surface-emitting lasers. Due to the detuning of the outcoupler grating, the outcoupled radiation emits two beams that deviate slightly from the normal axis. A design point may then be chosen where the power outcoupled by symmetric and antisymmetric modes cross and where the outcoupled power is independent of the phase variation.