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    Radiation shield and optical lattice clock including radiation shield
    4.
    发明授权
    Radiation shield and optical lattice clock including radiation shield 有权

    公开(公告)号：US11493887B2

    公开(公告)日：2022-11-08

    申请号：US16251619

    申请日：2019-01-18

    Applicant: RIKEN

    Inventor： Hidetoshi Katori ,  Masao Takamoto ,  Ichiro Ushijima ,  Takehiro Tawara ,  Hideo Yokota

    IPC: G04F5/14 ,  G02B5/20 ,  H03L7/26

    Abstract: Provided according to an embodiment of the present disclosure is a radiation shield 10 including a shield wall surrounding a hollow region capable of accommodating therein atoms for an optical lattice clock 100, the shield wall having, provided therein, at least two apertures communicating with outside. A geometrical shape of an inner wall surface of the shield wall is configured such that a difference between BBR shifts found under two conditions does not exceed a predetermined value over a range of position of atoms, the BBR shifts being caused in atoms 2 by emitted radiation emitted by the inner wall surface, incoming radiation leaking in from the outside through the apertures, and a reflection component of the emitted radiation and incoming radiation at the inner wall surface, the two conditions being a condition where the inner wall surface exhibits mirror reflection and a condition where the inner wall surface exhibits diffuse reflection, the range being where clock transition operation is carried out in the optical lattice clock, the inner wall surface facing the hollow region. Provided according to other embodiments of the present disclosure also are the optical lattice clock 100 including such a radiation shield, and a design method for the radiation shield.

    Optical lattice clock, clock device and laser light source
    7.
    发明授权
    Optical lattice clock, clock device and laser light source 有权
    光栅时钟，时钟器件和激光光源

    公开(公告)号：US09553597B2

    公开(公告)日：2017-01-24

    申请号：US14422177

    申请日：2013-08-12

    Applicant: RIKEN

    Inventor： Hidetoshi Katori

    IPC: H03L7/26 ,  G04F5/14 ,  H01S3/067

    CPC classification number: H03L7/26 ,  G04F5/14 ,  H01S3/06791

    Abstract: Various embodiments improve accuracy by increasing the number of atoms engaged in a clock transitions in an optical lattice clock. An exemplary optical lattice clock an embodiment comprises an optical waveguide, an optical path, a laser light source, and a laser cooler. The optical path has a hollow pathway that extends from a first end to a second end while being surrounded with a tubular wall, which is used as a waveguide path. The optical path passes between mirrors and through the pathway. The laser light source supplies to the optical path a pair of lattice lasers (L1 and L2) propagating in opposite directions with each other. The laser cooler supplies cooled atoms that have two levels of electronic states associated with a clock transition to the vicinity of the first end of the optical waveguide.

    Abstract translation: 各种实施例通过增加在光栅格时钟中的时钟转换中引入的原子的数量来提高精度。 示例性光学晶格时钟实施例包括光波导，光路，激光光源和激光冷却器。 光路具有从第一端延伸到第二端的中空路径，同时被用作波导路径的管状壁围绕。 光路通过反射镜和通过通路。 激光源向光路提供一对彼此相反方向传播的格子激光器（L1和L2）。 激光冷却器提供具有与时钟转变相关联的两级电子状态的冷却原子到光波导的第一端附近。

    Optical lattice clock and magnetic field correction method for optical lattice clock
    9.
    发明授权
    Optical lattice clock and magnetic field correction method for optical lattice clock 有权

    公开(公告)号：US11894854B2

    公开(公告)日：2024-02-06

    申请号：US17915776

    申请日：2021-03-30

    Applicant: JEOL Ltd. ,  RIKEN

    Inventor： Shigenori Tsuji ,  Masao Takamoto ,  Hidetoshi Katori

    IPC: H03L7/26 ,  G04F5/14

    CPC classification number: H03L7/26 ,  G04F5/145

    Abstract: An optical lattice clock includes a clock transition space having disposed therein an atom group trapped in an optical lattice, and a triaxial magnetic field correction coil for correcting the magnetic field of the clock transition space. Additionally, in a correction space that includes the clock transition space and is larger than the clock transition space, a photoreceiver promotes the clock transition of the atom group trapped in the optical lattice and acquires a clock transition frequency distribution for the correction space. Further, a corrector corrects the magnetic field of the triaxial magnetic field correction coil on the basis of the frequency distribution measured by the photo receiver.

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