Patents by Inventor Lihe ZHENG

Lihe ZHENG 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: 20220271488
    Abstract: A method for manufacturing an optical element is a method for manufacturing an optical element in which laser light is transmitted, reciprocated, or reflected, and the method includes a first step of obtaining a bonded element formed by subjecting a first element part and a second element part, both being transparent to laser light, to surface activated bonding with a non-crystalline layer interposed therebetween; and after the first step, a second step of crystallizing at least a portion of the non-crystalline layer by raising the temperature of the bonded element. In the second step, the temperature of the bonded element is raised to a predetermined temperature that is lower than the melting points of the first element part and the second element part.
    Type: Application
    Filed: June 12, 2020
    Publication date: August 25, 2022
    Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES
    Inventors: Takunori TAIRA, Arvydas KAUSAS, Lihe ZHENG
  • Publication number: 20220143752
    Abstract: A laser processing device according an embodiment is a laser processing device that irradiates a processing region of a workpiece with pulsed laser light through a liquid to subject the processing region to a laser peening process or a laser forming process. The laser processing device includes: a laser irradiation unit including a laser oscillator that outputs the pulsed laser light; and an accommodation unit that includes an injection port through which the liquid is injected to the processing region, and accommodates the laser irradiation unit. A pulse width of the pulsed laser light is 200 ps to 2 ns, and the pulsed laser light output from the laser oscillator is emitted to the processing region through a liquid that is injected from the injection port.
    Type: Application
    Filed: February 13, 2020
    Publication date: May 12, 2022
    Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES
    Inventors: Takunori TAIRA, Yuji SANO, Lihe ZHENG, Hwan Hong LIM
  • Patent number: 10367324
    Abstract: A laser component is provided, including a laser medium and a transparent heat transmitting member, at least one of which is oxide. Bonding surfaces of the laser medium and the transparent heat transmitting member are exposed to oxygen plasma, and thereafter the bonding surfaces are brought into contact without heating. The laser medium and the transparent heat transmitting member are bonded at atomic levels, their thermal resistance is low, and no large residual stress is generated due to the bonding taking place under normal temperature. The process of oxygen plasma exposure ensures transparency of their bonding interface. The laser medium and the transparent heat transmitting member are stably bond via an amorphous layer.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: July 30, 2019
    Assignee: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES
    Inventors: Takunori Taira, Arvydas Kausas, Lihe Zheng
  • Publication number: 20180123309
    Abstract: A laser component is provided, including a laser medium and a transparent heat transmitting member, at least one of which is oxide. Bonding surfaces of the laser medium and the transparent heat transmitting member are exposed to oxygen plasma, and thereafter the bonding surfaces are brought into contact without heating. The laser medium and the transparent heat transmitting member are bonded at atomic levels, their thermal resistance is low, and no large residual stress is generated due to the bonding taking place under normal temperature. The process of oxygen plasma exposure ensures transparency of their bonding interface. The laser medium and the transparent heat transmitting member are stably bond via an amorphous layer.
    Type: Application
    Filed: October 23, 2017
    Publication date: May 3, 2018
    Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NA TIONAL INSTITUTES OF NATURAL SCIENCES
    Inventors: Takunori TAIRA, Arvydas KAUSAS, Lihe ZHENG
  • Patent number: 9887511
    Abstract: Provided is a passive Q-switch laser device possessing a power density controller (15) making power density of excitation light from an excitation light source (14) equal to or greater than power density so that delay time required for reaching oscillation after start of excitation of a laser gain medium (12) becomes equal to or shorter than a laser upper energy level lifetime of the laser gain medium (12).
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: February 6, 2018
    Assignee: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTE OF NATURAL SCIENCES
    Inventors: Takunori Taira, Arvydas Kausas, Lihe Zheng
  • Publication number: 20170358898
    Abstract: A technique which is suitable in joining an end surface of a laser medium to a transparent heat sink for maintaining thermal resistance therebetween low and avoiding large thermal stress from acting on the laser medium is to be provided. An end coat is provided on the end surface of the laser medium, a same-material layer constituted of a same material as the heat sink is provided on a surface of the end coat, a surface of the same-material layer and an end surface of the heat sink are activated in a substantially vacuum environment, and those activated surfaces are bonded in the substantially vacuum environment. A laser apparatus having low thermal resistance between the laser medium and the heat sink and high transparency at a joint interface therebetween, and no large thermal stress acting on the laser medium is thereby obtained.
    Type: Application
    Filed: May 31, 2017
    Publication date: December 14, 2017
    Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES
    Inventors: Takunori TAIRA, Arvydas KAUSAS, Lihe ZHENG, Vincent YAHIA, Ryo YASUHARA
  • Publication number: 20170201061
    Abstract: Provided is a passive Q-switch laser device possessing a power density controller (15) making power density of excitation light from an excitation light source (14) equal to or greater than power density so that delay time required for reaching oscillation after start of excitation of a laser gain medium (12) becomes equal to or shorter than a laser upper energy level lifetime of the laser gain medium (12).
    Type: Application
    Filed: January 9, 2017
    Publication date: July 13, 2017
    Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL
    Inventors: Takunori TAIRA, Arvydas KAUSAS, Lihe ZHENG