Patents by Inventor Quankui Yang

Quankui Yang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High-efficiency unipolar quantum cascade laser
    Patent number: 8000367
    Abstract: The present invention pertains to a unipolar quantum cascade laser consisting of several semiconductor multilayer structures (C) that are layered behind one another between two electrodes in a periodic sequence such that an active area (A) and a transitional or injection area (B) respectively alternate. The active areas (A) respectively have at least one upper and one lower energy level for electrons, between which electron transitions (T) emitting light take place. The transitional or injection areas (B) are realized in such a way that they allow the electron transport from the lower energy level of the preceding active area referred to the transport direction into the upper energy level of the following active area referred to the transport direction.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: August 16, 2011
    Assignee: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V.
    Inventors: Quankui Yang, Christian Manz
  • HIGH-EFFICIENCY UNIPOLAR QUANTUM CASCADE LASER
    Publication number: 20100067557
    Abstract: The present invention pertains to a unipolar quantum cascade laser consisting of several semiconductor multilayer structures (C) that are layered behind one another between two electrodes in a periodic sequence such that an active area (A) and a transitional or injection area (B) respectively alternate. The active areas (A) respectively have at least one upper and one lower energy level for electrons, between which electron transitions (T) emitting light take place. The transitional or injection areas (B) are realized in such a way that they allow the electron transport from the lower energy level of the preceding active area referred to the transport direction into the upper energy level of the following active area referred to the transport direction.
    Type: Application
    Filed: January 18, 2008
    Publication date: March 18, 2010
    Inventors: Quankui Yang, Christian Manz