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    LASER MODULE
    2.
    发明公开
    LASER MODULE 审中-公开

    公开(公告)号：US20230318255A1

    公开(公告)日：2023-10-05

    申请号：US18124658

    申请日：2023-03-22

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Shohei HAYASHI ,  Kazuue FUJITA ,  Akio ITO ,  Atsushi NAKANISHI

    IPC: H01S5/02253 ,  H01S5/02216 ,  H01S5/34 ,  H01S5/02315 ,  H01S5/14 ,  H01S5/06

    CPC classification number: H01S5/02253 ,  H01S5/02216 ,  H01S5/3402 ,  H01S5/02315 ,  H01S5/141 ,  H01S5/0607 ,  H01S2302/02

    Abstract: The laser module includes a QCL element and a support member. The QCL element has a first end surface located on a first side in a second direction orthogonal to a stacking direction and a second end surface located on a second side opposite to the first side in the second direction. The substrate has first to fourth substrate-surfaces. The support member has a first portion having a first surface facing at least a portion of the fourth substrate-surface, and a second portion having a second surface facing at least a portion of the first substrate-surface and a third surface located opposite to the second surface in the second direction. At least a part of the terahertz wave generated in the active layer is incident on the second surface of the support member through the substrate and is emitted from the third surface through the inside of the second portion.

    QUANTUM CASCADE LASER
    3.
    发明申请
    QUANTUM CASCADE LASER 有权

    公开(公告)号：US20220311215A1

    公开(公告)日：2022-09-29

    申请号：US17701899

    申请日：2022-03-23

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Akio ITO ,  Kazuue FUJITA ,  Shohei HAYASHI ,  Tatsuo DOUGAKIUCHI

    IPC: H01S5/34 ,  H01S5/026

    Abstract: A quantum cascade laser includes a semiconductor substrate, an optical waveguide formed on a first surface of the semiconductor substrate, and a temperature adjusting member. The optical waveguide includes a first region and a second region located on one side with respect to the first region in the optical waveguide direction of the optical waveguide. The first region generates a first light having a first wavelength, and the second region generates a second light having a second wavelength. The optical waveguide generates an output light having a frequency corresponding to a difference between the first wavelength and the second wavelength by difference-frequency generation. A recess for suppressing heat transfer between the first region and the second region is formed at a second surface of the semiconductor substrate. The temperature adjusting member includes a first temperature adjusting member for adjusting the temperature of the second region.

    TERAHERTZ WAVE LENS AND METHOD FOR PRODUCING TERAHERTZ WAVE LENS
    4.
    发明申请
    TERAHERTZ WAVE LENS AND METHOD FOR PRODUCING TERAHERTZ WAVE LENS 有权

    公开(公告)号：US20210194144A1

    公开(公告)日：2021-06-24

    申请号：US17120885

    申请日：2020-12-14

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Shohei HAYASHI ,  Tetsushi SHIMOMURA ,  Hiroyasu FUJIWARA

    IPC: H01Q15/02 ,  C23F4/00

    Abstract: A terahertz wave lens concentrates or collimates a terahertz wave. The terahertz wave lens includes a substrate having a surface provided with an uneven structure that changes a phase of the terahertz wave. The uneven structure includes a plurality of pillars that are periodically arranged. The uneven structure includes a plurality of regions where the plurality of pillars are arranged. A height of the pillar in a thickness direction of the substrate and a width of the pillar differ for each of the regions. A distance (period) between centers of the pillars adjacent to each other is constant. Outer end portions of the uneven structure in the thickness direction are located on the same plane.

    PHOTODETECTION ELEMENT
    5.
    发明申请
    PHOTODETECTION ELEMENT 审中-公开

    公开(公告)号：US20190058073A1

    公开(公告)日：2019-02-21

    申请号：US16100457

    申请日：2018-08-10

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Hiroyasu FUJIWARA ,  Wei DONG ,  Kazutoshi NAKAJIMA ,  Shohei HAYASHI

    IPC: H01L31/108 ,  H01L31/07 ,  H01L31/0352 ,  H01L31/0232 ,  H01L31/101

    Abstract: A photodetection element is a photodetection element having an incidence surface for light on a back surface of a semiconductor layer, and includes a periodic nano-concave/convex structure provided on a front surface of the semiconductor layer and having convex portions and concave portions constituting a longitudinal resonator and a transverse resonator for the light incident from the incidence surface, the periodic nano-concave/convex structure converting the light into surface plasmons, and a metal film provided to cover the periodic nano-concave/convex structure, a height and an arrangement pitch of the convex portions in the periodic nano-concave/convex structure are set such that a resonance wavelength of the longitudinal resonator and a resonance wavelength of the transverse resonator match, and a thickness of the metal film is equal to or greater than 20 nm.

    LASER MODULE
    6.
    发明公开
    LASER MODULE 审中-公开

    公开(公告)号：US20230361536A1

    公开(公告)日：2023-11-09

    申请号：US18115844

    申请日：2023-03-01

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Hisanari TAKAHASHI ,  Kazuue FUJITA ,  Shohei HAYASHI

    IPC: H01S5/04 ,  H01S5/34 ,  H01S5/02 ,  H01S5/02253

    CPC classification number: H01S5/3402 ,  H01S5/021 ,  H01S5/02253 ,  H01S5/041 ,  H01S2302/02

    Abstract: The laser module includes a QCL element and a light source. The QCL element includes a substrate, a lower clad layer provided on the substrate, an active layer that is provided on an opposite side of the lower clad layer from the substrate and generates a first terahertz wave, an upper clad layer provided on an opposite side of the active layer from the lower clad layer, and a first electrode provided on an opposite side of the upper clad layer from the active layer. The second terahertz wave from the light source enters the active layer through the substrate, is reflected by the first electrode, and is amplified or wavelength-converted. The third terahertz wave amplified or wavelength-converted in the active layer is emitted to the outside through the substrate.

    LASER MODULE
    7.
    发明申请
    LASER MODULE 有权

    公开(公告)号：US20220209505A1

    公开(公告)日：2022-06-30

    申请号：US17608225

    申请日：2020-12-16

    Applicant: HAMAMATSU PHOTONICS K.K.

    Inventor： Kazuue FUJITA ,  Shohei HAYASHI ,  Hiroyasu FUJIWARA ,  Atsushi NAKANISHI ,  Akio ITO ,  Tatsuo DOUGAKIUCHI

    IPC: H01S5/34 ,  H01S5/343

    Abstract: A laser module including a quantum cascade laser that includes a substrate having a main surface, a first clad layer provided on the main surface, an active layer provided on the first clad layer, and a second clad layer provided on the active layer, and a lens that has a lens plane disposed at a position facing the end surface of the active layer. An end surface of the active layer constitutes a resonator that causes light of a first frequency and light of a second frequency to oscillate, and the active layer is configured to generate a terahertz wave of a differential frequency between the first frequency and the second frequency. The substrate is in direct contact or indirect contact with the lens plane, and the end surface of the active layer is inclined with respect to a portion facing the end surface in the lens plane.

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