Patents by Inventor Shanchao ZHANG

Shanchao ZHANG 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).

  • Two-dimensional magneto-optical trap for neutral atoms
    Patent number: 8835833
    Abstract: A two-dimensional (2D) magneto-optical trap (MOT) for alkali neutral atoms establishes a zero magnetic field along the longitudinal symmetry axis. Two of three pairs of trapping laser beams do not follow the symmetry axes of the quadruple magnetic field and are aligned with a large non-zero degree angles to the longitudinal axis. In a dark-line 2D MOT configuration, there are two orthogonal repumping beams. In each repumping beam, an opaque line is imaged to the longitudinal axis, and the overlap of these two line images creates a dark line volume in the longitudinal axis where there is no repumping light. The zero magnetic field along the longitudinal axis allows the cold atoms maintain a long ground-state coherence time without switching off the MOT magnetic field, which makes it possible to operate the MOT at a high repetition rate and a high duty cycle.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: September 16, 2014
    Assignees: The Hong Kong University of Science and Technology, The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shengwang Du, Shanchao Zhang, Shuyu Zhou, Guang Yu Yin, Chinmay Belthangady
  • TWO-DIMENSIONAL MAGNETO-OPTICAL TRAP FOR NEUTRAL ATOMS
    Publication number: 20130048846
    Abstract: A two-dimensional (2D) magneto-optical trap (MOT) for alkali neutral atoms establishes a zero magnetic field along the longitudinal symmetry axis. Two of three pairs of trapping laser beams do not follow the symmetry axes of the quadruple magnetic field and are aligned with a large non-zero degree angles to the longitudinal axis. In a dark-line 2D MOT configuration, there are two orthogonal repumping beams. In each repumping beam, an opaque line is imaged to the longitudinal axis, and the overlap of these two line images creates a dark line volume in the longitudinal axis where there is no repumping light. The zero magnetic field along the longitudinal axis allows the cold atoms maintain a long ground-state coherence time without switching off the MOT magnetic field, which makes it possible to operate the MOT at a high repetition rate and a high duty cycle.
    Type: Application
    Filed: August 29, 2012
    Publication date: February 28, 2013
    Applicants: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY, THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Shengwang DU, Shanchao ZHANG, Shuyu ZHOU, Guang Yu YIN, Chinmay BELTHANGADY