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    Method for wavelength control of silicon photonic external cavity tunable laser
    2.
    发明授权
    Method for wavelength control of silicon photonic external cavity tunable laser 有权

    公开(公告)号：US12119616B2

    公开(公告)日：2024-10-15

    申请号：US18499471

    申请日：2023-11-01

    申请人： NeoPhotonics Corporation

    发明人： Yongkang Gao ,  Jiann-Chang Lo

    IPC分类号： H01S5/14 ,  H01S3/137 ,  H01S5/024 ,  H01S5/10

    CPC分类号： H01S5/141 ,  H01S3/137 ,  H01S5/02415 ,  H01S5/1007

    摘要： A tunable solid state laser device are described comprising a semiconductor based gain chip and a silicon photonic filter chip with tuning capability. The silicon photonic filter chip can comprises an input-output silicon waveguide, at least two ring resonators formed with silicon waveguides, one or more connecting silicon waveguides interfacing with the ring resonators, a separate heater associated with each ring resonator, a temperature sensor configured to measure the chip temperature, and a controller connected to the temperature sensor and the separate heaters and programmed with a feedback loop to maintain the filter temperature to provide the tuned frequency. The one or more connecting silicon waveguides are configured to redirect light resonant with each of the at least two ring resonators back through the input-output silicon waveguide. Corresponding methods are described for the control of the laser frequency. Improved structures of the SiPho multiple filter chip involve a Zagnac interferometer.

    Light emitting device
    4.
    发明授权
    Light emitting device 有权

    公开(公告)号：US12107384B2

    公开(公告)日：2024-10-01

    申请号：US18494190

    申请日：2023-10-25

    申请人： NICHIA CORPORATION

    发明人： Shota Murakami ,  Soichiro Miura

    IPC分类号： H01S5/022 ,  H01S5/024 ,  H01S5/026

    CPC分类号： H01S5/022 ,  H01S5/02461 ,  H01S5/0262

    摘要： A light emitting device includes: a base having a bottom face and a lateral part surrounding the bottom face and extending upwards from the bottom face, wherein the lateral part has an uppermost face and includes a first stepped portion including a first upper face and a second stepped portion including a second upper face, wherein the first upper face and the second upper face are disposed below the uppermost face, wherein the first upper face and the second upper face are disposed inward of the uppermost face in a top view, and wherein a height of the first stepped portion from the bottom face is lower than a height of the second stepped portion from the bottom face; a semiconductor laser element disposed on the bottom face; and a light reflective member and/or an optical member disposed on the bottom face.

    WAVELENGTH LOCKER FOR DISTRIBUTED FEEDBACK TUNABLE LASER
    6.
    发明公开
    WAVELENGTH LOCKER FOR DISTRIBUTED FEEDBACK TUNABLE LASER 审中-公开

    公开(公告)号：US20240297477A1

    公开(公告)日：2024-09-05

    申请号：US18116365

    申请日：2023-03-02

    申请人： NeoPhotonics Corporation

    发明人： Jiann-Chang Lo ,  Vinson Mar

    IPC分类号： H01S5/00 ,  H01S5/024 ,  H01S5/06 ,  H01S5/0687

    CPC分类号： H01S5/0078 ,  H01S5/02415 ,  H01S5/0612 ,  H01S5/0687

    摘要： A tunable distributed feedback (DFB) laser unit comprises:



    a thermo-electric cooler;
    a tunable DFB laser diode; and
    an optical filter chip comprising:

    a tunable optical filter;
    a first optical splitter with an optical tap and an output path, and
    a first photodetector configured to receive light from the optical tap from the first optical splitter and to monitor output intensity from the tunable optical filter;


    wherein the tunable DFB laser diode is supported on the thermo-electric cooler and wherein the light from the tunable laser diode or a fraction thereof is directed through the tunable optical filter.




    The tunable DFB laser unit can be used in a method for wavelength locking the DFB laser.

    High powered laser electronics
    10.
    发明授权
    High powered laser electronics 有权

    公开(公告)号：US12051888B2

    公开(公告)日：2024-07-30

    申请号：US18115578

    申请日：2023-02-28

    申请人： IPG Photonics Corporation

    发明人： Adam Pinard ,  Wolf Fuchs ,  Keith Millea ,  Oleg Shkurikhin

    IPC分类号： H01S3/13 ,  H01S5/024 ,  H01S5/042 ,  H01S5/068 ,  H01S5/40 ,  H01S5/022

    CPC分类号： H01S5/4025 ,  H01S5/02423 ,  H01S5/042 ,  H01S5/06808 ,  H01S5/022 ,  H01S5/02438

    摘要： A laser system includes a high voltage AC-to-DC power converter and one or more current sources coupled to the power converter without a DC-to-DC converter between the current sources and the power converter. Each of the current sources includes a high voltage switch and one or more independent safety shutoffs. A laser module is operably coupled to the one or more current source and configured to emit electromagnetic radiation wherein the one or more safety shutoffs are configured to disable emission of electromagnetic radiation from the laser module when triggered. A current source controller coupled to the safety shutoff(s) is configured to generate enabling signals that enable normal current source operation. The controller includes circuitry configured to measure power across the high voltage switch when the controller instructs the high voltage switch to turn off to determine proper operation of the safety shutoff(s).