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:
Jul. 09, 2024
Filed:
Jul. 16, 2020
Trumpf Photonic Components Gmbh, Ulm, DE;
Philipp Henning Gerlach, Ulm, DE;
TRUMPF PHOTONIC COMPONENTS GMBH, Ulm, DE;
Abstract
A vertical cavity surface emitting laser includes four contacts and an optical resonator (having two Bragg reflectors, a photodiode, and an active layer between the Bragg reflectors). The second Bragg reflector has three parts. The first part has a pair of layers with different refractive indices and a second conductivity type. The second part has a pair of layers with different refractive indices and a first conductivity type. The third part has a pair of layers with different refractive indices and the second conductivity type. A light absorption structure of the photodiode is between the second and third parts. The first and second electrical contacts provide a current to pump the resonator. The light absorption structure is outside the current path. The third and fourth electrical contacts contact the photodiode. The second and third electrical contact respectively contact the first and second parts and are separated by a semiconductor layer.