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:
Apr. 07, 1992
Filed:
Jul. 30, 1990
Donald R Scifres, San Jose, CA (US);
David F Welch, San Jose, CA (US);
William Streifer, deceased, late of Palo Alto, CA (US);
Spectra Diode Laboratories, Inc., San Jose, CA (US);
Abstract
An integrated master oscillator/power amplifier semiconduction device having a laser diode oscillator, a broad area light amplifier and a coupling grating disposed to deflect light at an angle from the laser oscillator to the light amplifier. The amplifier may terminate as an output facet or use a grating surface emitter to couple amplified light out of the device. The orientation angle and grating period of the coupling grating are chosen to minimize feedback from the amplifier into the laser. This is achieved either by deflecting the light by other than a 90.degree. angle or by orienting the grating at other than 45.degree. with respect to laser even though light is deflected by 90.degree. so that any return light effectively 'sees' a different grating. The laser can be a DFB or DBR laser and can be wavelength tunable.