Patents by Inventor Yangjian CAI

Yangjian CAI 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: 20240231131
    Abstract: The invention provides a method and a system for generating a robust higher-order Poincaré sphere polarization state.
    Type: Application
    Filed: December 30, 2021
    Publication date: July 11, 2024
    Inventors: Yahong CHEN, Zhen DONG, Xi SUN, Shilei TAN, Fei WANG, Yangjian CAI
  • Patent number: 12025429
    Abstract: The invention discloses an optical imaging system and an imaging method regulated based on a spatial coherence structure, including the steps of: building a 4f imaging system; detecting, by a first optical detector, the shape of the spectrum domain obstacle in the 4f imaging system; designing a spatial coherence structure of the incident beam based on the shape of the spectrum domain obstacle, so that all the modes of the incident beam can pass through the opening in the obstacle; and placing an object to be detected in the optical path and detecting, by the second optical detector, the optical imaging information of the object to be detected. According to the present invention, in the case where the frequency plane of the 4f optical imaging system is partially occluded, imaging without speckles is enabled, utilization of the systematic light is substantially improved, and the signal-to-noise ratio in imaging is improved.
    Type: Grant
    Filed: February 20, 2021
    Date of Patent: July 2, 2024
    Assignee: SOOCHOW UNIVERSITY
    Inventors: Yahong Chen, Deming Peng, Yuechen Shen, Hu Sun, Fei Wang, Yangjian Cai
  • Patent number: 11853386
    Abstract: The invention relates to a method for rapidly calculating a three-dimensional polarimetric dimension, including: determining that an incident light field is a coherence matrix of a partially coherent Schell-model beam, and decomposing the coherence matrix into a form of multiplying an incident electric field by a coherence structure matrix of the incident light field; obtaining an electric field near a focal field after the incident electric field passes through a tight focusing system according to the vector diffraction theory, and describing a second-order correlation characteristic of a partially coherent vector beam near a tightly focused field by using a coherence matrix; obtaining a tightly focused polarization matrix based on the tightly focused coherence matrix; and rotating the tightly focused polarization matrix into an intrinsic coordinate frame of the tightly focused polarization matrix, and calculating a three-dimensional polarimetric dimension of the partially coherent Schell-model beam in the t
    Type: Grant
    Filed: February 11, 2022
    Date of Patent: December 26, 2023
    Assignee: SOOCHOW UNIVERSITY
    Inventors: Yahong Chen, Chencheng Yan, Fei Wang, Yangjian Cai
  • Publication number: 20230394108
    Abstract: The invention relates to a method for rapidly calculating a three-dimensional polarimetric dimension, including: determining that an incident light field is a coherence matrix of a partially coherent Schell-model beam, and decomposing the coherence matrix into a form of multiplying an incident electric field by a coherence structure matrix of the incident light field; obtaining an electric field near a focal field after the incident electric field passes through a tight focusing system according to the vector diffraction theory, and describing a second-order correlation characteristic of a partially coherent vector beam near a tightly focused field by using a coherence matrix; obtaining a tightly focused polarization matrix based on the tightly focused coherence matrix; and rotating the tightly focused polarization matrix into an intrinsic coordinate frame of the tightly focused polarization matrix, and calculating a three-dimensional polarimetric dimension of the partially coherent Schell-model beam in the t
    Type: Application
    Filed: February 11, 2022
    Publication date: December 7, 2023
    Inventors: Yahong CHEN, Chencheng YAN, Fei WANG, Yangjian CAI
  • Publication number: 20230366732
    Abstract: A to-be-measured partially coherent fractional vortex beam passes through a scattering object, an error between measurable information and to-be-measured information is minimized by using an optimization algorithm, and a main electric field mode and a weight of a to-be-measured fractional vortex beam are reconstructed by using a multimode stacked diffraction algorithm. A cross-spectral density function of the partially coherent fractional vortex beam is calculated, a cross-spectral density of a partially coherent fractional vortex optical field is reconstructed, and complete information including light intensity, a light intensity association, an electric field association, a phase, and the like of the partially coherent fractional vortex optical field is obtained.
    Type: Application
    Filed: May 12, 2023
    Publication date: November 16, 2023
    Inventors: Zhuoyi WANG, Chengliang ZHAO, Xingyuan LU, Qidong LIN, Xiaotan LU, Xuechun ZHAO, Yangjian CAI
  • Publication number: 20230314822
    Abstract: The invention provides a method and a system for generating a polarized propagation-invariant light field. The system includes a laser source, a spatial light modulator, a computer, a first lens, a shading element, a first quarter-wave plate, a second quarter-wave plate, a second lens, and a beam combining element. In the present invention, two Laguerre-Gaussian mode beams that satisfy a particular Gouy order relationship are generated, and orthogonal even polarization is applied to the two Laguerre-Gaussian mode beams. The two Laguerre-Gaussian mode beams are then focused onto a Ronchi grating to be stably combined into polarized propagation-invariant light field. The light field generated in the present invention simultaneously has linear polarization, elliptical polarization, and circular polarization in a cross section of the light field, and in a propagation process of the light field in free space, apart from normal spot size scaling, polarization distribution remains unchanged.
    Type: Application
    Filed: December 27, 2021
    Publication date: October 5, 2023
    Inventors: Yahong CHEN, Zhen DONG, Xi SUN, Fei WANG, Yangjian CAI
  • Publication number: 20230314309
    Abstract: The invention relates to an optical imaging system and method based on spatial structure engineering of random light. The method includes performing scattering processing on transmitted light to obtain a to-be-measured light; splitting polarization of the to-be-measured light, wherein one light is split into x-polarized and y-polarized beams, and the other one is firstly combined with a reference beam and then split into x-polarized and y-polarized beams; measuring the intensity distributions of x-polarized and y-polarized parts of the to-be-measured light, the combined light, and the reference light; obtaining a real part and an imaginary part of the cross spectral density of the to-be-measured light, retrieving the intensity distribution of the light on the scattering medium and calculating the intensity to obtain the shape and location of the object to be measured.
    Type: Application
    Filed: June 21, 2021
    Publication date: October 5, 2023
    Inventors: Yahong CHEN, Deming PENG, Yonglei LIU, Fei WANG, Yangjian CAI
  • Publication number: 20230175837
    Abstract: The invention discloses an optical imaging system and an imaging method regulated based on a spatial coherence structure, including the steps of: building a 4f imaging system; detecting, by a first optical detector, the shape of the spectrum domain obstacle in the 4f imaging system; designing a spatial coherence structure of the incident beam based on the shape of the spectrum domain obstacle, so that all the modes of the incident beam can pass through the opening in the obstacle; and placing an object to be detected in the optical path and detecting, by the second optical detector, the optical imaging information of the object to be detected. According to the present invention, in the case where the frequency plane of the 4f optical imaging system is partially occluded, imaging without speckles is enabled, utilization of the systematic light is substantially improved, and the signal-to-noise ratio in imaging is improved.
    Type: Application
    Filed: February 20, 2021
    Publication date: June 8, 2023
    Inventors: Yahong CHEN, Deming PENG, Yuechen SHEN, Hu SUN, Fei WANG, Yangjian CAI
  • Patent number: 11366017
    Abstract: The invention discloses a method for measuring a complex degree of coherence of a random optical field by using a mutual intensity-intensity correlation, including the steps of: building a test optical path; rotating a quarter-wave plate to enable the fast axis of the quarter-wave plate to be consistent with a polarization direction of reference light, to obtain light intensity distribution information of a first combined light; rotating the quarter-wave plate to enable the slow axis of the quarter-wave plate to be consistent with the polarization direction of the reference light, to obtain light intensity distribution information of a second combined light; blocking the reference light to obtain light intensity distribution information of to-be-tested light; blocking the to-be-tested light to obtain light intensity distribution information of the reference light; and calculating the amplitude and phase of a complex degree of coherence of the to-be-tested light.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: June 21, 2022
    Assignee: SOOCHOW UNIVERSITY
    Inventors: Yahong Chen, Zhaofeng Huang, Fei Wang, Yangjian Cai
  • Publication number: 20210278283
    Abstract: The invention discloses a method for measuring a complex degree of coherence of a random optical field by using a mutual intensity-intensity correlation, including the steps of: building a test optical path; rotating a quarter-wave plate to enable the fast axis of the quarter-wave plate to be consistent with a polarization direction of reference light, to obtain light intensity distribution information of a first combined light; rotating the quarter-wave plate to enable the slow axis of the quarter-wave plate to be consistent with the polarization direction of the reference light, to obtain light intensity distribution information of a second combined light; blocking the reference light to obtain light intensity distribution information of to-be-tested light; blocking the to-be-tested light to obtain light intensity distribution information of the reference light; and calculating the amplitude and phase of a complex degree of coherence of the to-be-tested light.
    Type: Application
    Filed: June 8, 2020
    Publication date: September 9, 2021
    Inventors: Yahong CHEN, Zhaofeng HUANG, Fei WANG, Yangjian CAI