Patents by Inventor Enxue YUN

Enxue YUN 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).

  • Publication number: 20240297480
    Abstract: Provided are a method and a system for bichromatic laser frequency stabilization based on differential detection of coexisting Lamb-dips and Lamb-peaks under multiple interactions. Based on multiple interactions between a multichromatic laser beam and a quantum resonance system in a Doppler-free configuration, and by setting the relative polarization directions and Raman phases between the pump and probe light which propagate in opposite directions and overlap in space, Lamb-dips and Lamb-peaks signals are generated; and by subtracting one from the other, a Doppler-free quantum resonance signal with high rejection of Doppler-broadening background and common-mode noise is obtained. The Doppler-free quantum resonance signal obtained in the present application has improved contrast and signal-to-noise ratio, and maintained narrow linewidth, making it applicable for precision spectral measurement as well as for laser frequency locking.
    Type: Application
    Filed: August 10, 2023
    Publication date: September 5, 2024
    Applicant: National Time Service Center (NTSC), Chinese Academy of Science (CAS)
    Inventors: Shougang ZHANG, Tenghui YANG, Enxue Yun, Qiang HAO, Guobin LIU, Yuping GAO
  • Patent number: 11507025
    Abstract: The invention relates to a differential detection of double-modulation (DM) CPT method and a system for implementing the method of this invention. The method comprises the following steps: Generating a coherent bichromatic light, in which the polarization and the relative phase are synchronously modulated. The DM light interacts with a quantum resonance system and prepares it into a CPT state. Then the polarization of coherent bichromatic light is switched from circular polarization to linear polarization. After interacting with the CPT state prepared in the previous stage, the constructive and destructive quantum interference occur simultaneously. The polarization of the transmitted light from the quantum resonance system is converted and spatially separated. Then two CPT signals, detected by balanced photodetectors, are observed with constructive and destructive interference respectively.
    Type: Grant
    Filed: April 1, 2021
    Date of Patent: November 22, 2022
    Assignee: National Time Service Center (NTSC), Chinese Academy of Science (CAS)
    Inventors: Enxue Yun, Qinglin Li, Qiang Hao, Guobin Liu, Yuping Gao, Shougang Zhang
  • Patent number: 11463097
    Abstract: The invention relates to a coherent population trapping (CPT) phase modulation and demodulation method and a system for implementing the method of this invention. The method comprises the following steps: Generating a coherent bichromatic light, in which the relative phase between the two frequency components is modulated with proper modulation depth. The phase modulated coherent bichromatic light interacts with a quantum resonance system, and prepares it alternately into two inverted CPT states. Detecting the transmitted light with a photodetector, two inverted dispersive CPT signals in two detection windows are observed. With synchronous phase demodulation, a CPT error signal is obtained, which is used for locking the local oscillator to implement a CPT atomic clock.
    Type: Grant
    Filed: March 29, 2021
    Date of Patent: October 4, 2022
    Assignee: National Time Service Center (NTSC), Chinese Academy of Science (CAS)
    Inventors: Enxue Yun, Qinglin Li, Qiang Hao, Guobin Liu, Yuping Gao, Shougang Zhang
  • Publication number: 20220173743
    Abstract: The invention relates to a coherent population trapping (CPT) phase modulation and demodulation method and a system for implementing the method of this invention. The method comprises the following steps: Generating a coherent bichromatic light, in which the relative phase between the two frequency components is modulated with proper modulation depth. The phase modulated coherent bichromatic light interacts with a quantum resonance system, and prepares it alternately into two inverted CPT states. Detecting the transmitted light with a photodetector, two inverted dispersive CPT signals in two detection windows are observed. With synchronous phase demodulation, a CPT error signal is obtained, which is used for locking the local oscillator to implement a CPT atomic clock.
    Type: Application
    Filed: March 29, 2021
    Publication date: June 2, 2022
    Inventors: Enxue Yun, QINGLIN LI, QIANG HAO, GUOBIN LIU, YUPING GAO, SHOUGANG ZHANG
  • Publication number: 20220171343
    Abstract: The invention relates to a differential detection of double-modulation (DM) CPT method and a system for implementing the method of this invention. The method comprises the following steps: Generating a coherent bichromatic light, in which the polarization and the relative phase are synchronously modulated. The DM light interacts with a quantum resonance system and prepares it into a CPT state. Then the polarization of coherent bichromatic light is switched from circular polarization to linear polarization. After interacting with the CPT state prepared in the previous stage, the constructive and destructive quantum interference occur simultaneously. The polarization of the transmitted light from the quantum resonance system is converted and spatially separated. Then two CPT signals, detected by balanced photodetectors, are observed with constructive and destructive interference respectively.
    Type: Application
    Filed: April 1, 2021
    Publication date: June 2, 2022
    Inventors: Enxue Yun, QINGLIN LI, QIANG HAO, GUOBIN LIU, YUPING GAO, SHOUGANG ZHANG
  • Patent number: 9001861
    Abstract: A device for producing a coherent bi-color light source, including: an array substrate, a first laser tube driven by a first direct current signal, a second laser tube driven by a modulation signal coupled by a microwave signal and a second DC signal, a half wave plate, a birefringent crystal, a first quarter wave plate, a partially reflecting plane mirror, and a second quarter wave plate. The first laser tube and the second laser tube are fixed on the array substrate. The half wave plate, the birefringent crystal, the first quarter wave plate, the partially reflecting plane mirror, and the second quarter wave plate are disposed in sequence in an emission direction of a laser beam emitted by the first laser tube. The second laser tube is disposed opposite to the birefringent crystal.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: April 7, 2015
    Assignee: Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences
    Inventors: Enxue Yun, Bozhong Tan, Sihong Gu
  • Publication number: 20140355640
    Abstract: A device for producing a coherent bi-color light source, including: an array substrate, a first laser tube driven by a first direct current signal, a second laser tube driven by a modulation signal coupled by a microwave signal and a second DC signal, a half wave plate, a birefringent crystal, a first quarter wave plate, a partially reflecting plane mirror, and a second quarter wave plate. The first laser tube and the second laser tube are fixed on the array substrate. The half wave plate, the birefringent crystal, the first quarter wave plate, the partially reflecting plane mirror, and the second quarter wave plate are disposed in sequence in an emission direction of a laser beam emitted by the first laser tube. The second laser tube is disposed opposite to the birefringent crystal.
    Type: Application
    Filed: August 13, 2014
    Publication date: December 4, 2014
    Inventors: Enxue YUN, Bozhong TAN, Sihong GU