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:
Mar. 02, 1993
Filed:
Jan. 21, 1992
Pieter I Kuindersma, Eindhoven, NL;
Teunis Van Dongen, Eindhoven, NL;
Gerardus L Van Der Hofstad, Eindhoven, NL;
Marcellinus B Kemp, Veldhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A semiconductor diode laser (1) with a monitor diode (2) includes a semiconductor body with a substrate (4) and a superimposed layer structure (5) having an active layer (6) and a pn junction (7) with which radiation (24) can be generated. The monitor diode (2) is separated from the diode laser by a groove (10) which extends into the substrate (4) and of which one of the walls forms an end face of the laser. The groove (10) and the monitor diode (2) are present at the side where the main radiation beam (24) emerges, while the active layer (6) extends over at most only a small portion, preferably at most 20%, of the length of the monitor diode (2). The length in the monitor diode over which absorption takes place is preferably smaller than the absorption length for the emitted laser radiation.