Patents by Inventor Yingjun Han

Yingjun Han 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).

  • Apparatus and method of power measurement for pulsed terahertz quantum-cascade laser
    Patent number: 8749225
    Abstract: The present invention provides a power measurement apparatus and method for a pulsed terahertz quantum-cascade laser (THz QCL). The apparatus includes a light source part, a light path part, and a detection part. Terahertz light emitted by a THz QCL reaches a terahertz quantum-well photodetector (THz QWP) through the measurement apparatus, and is absorbed to generate a corresponding current signal. A signal processing circuit extracts a voltage signal from the current signal, amplifies the voltage signal, and inputs the amplified voltage signal to an oscilloscope for reading and displaying. According to a responsivity of the THz QWP at a lasing frequency of the laser, the measurement of the output power of the pulsed THz QCL is acquired.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: June 10, 2014
    Assignee: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
    Inventors: Zhiyong Tan, Juncheng Cao, Yingjun Han, Zhen Chen
  • Apparatus and Method of Power Measurement for Pulsed Terahertz Quantum-Cascade Laser
    Publication number: 20140103904
    Abstract: The present invention provides a power measurement apparatus and method for a pulsed terahertz quantum-cascade laser (THz QCL). The apparatus includes a light source part, a light path part, and a detection part. Terahertz light emitted by a THz QCL reaches a terahertz quantum-well photodetector (THz QWP) through the measurement apparatus, and is absorbed to generate a corresponding current signal. A signal processing circuit extracts a voltage signal from the current signal, amplifies the voltage signal, and inputs the amplified voltage signal to an oscilloscope for reading and displaying. According to a responsivity of the THz QWP at a lasing frequency of the laser, the measurement of the output power of the pulsed THz QCL is acquired.
    Type: Application
    Filed: August 29, 2011
    Publication date: April 17, 2014
    Inventors: Zhiyong Tan, Juncheng Cao, Yingjun Han, Zhen Chen