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    LIGHT AMPLIFICATION DEVICE AND LIGHT AMPLIFICATION METHOD
    21.
    发明公开
    LIGHT AMPLIFICATION DEVICE AND LIGHT AMPLIFICATION METHOD 审中-公开

    公开(公告)号：US20240120703A1

    公开(公告)日：2024-04-11

    申请号：US18275989

    申请日：2022-02-04

    Applicant: NEC Corporation

    Inventor： Hitoshi TAKESHITA

    IPC: H01S3/094 ,  H01S3/067 ,  H01S3/23

    CPC classification number: H01S3/094015 ,  H01S3/06758 ,  H01S3/2383

    Abstract: Because a light amplification device using a multicore optical fiber provides low utilization efficiency of excitation light according to a cladding excitation system, the present disclosure provides a light amplification device including: a first optical waveguide including a first light amplification medium; a second optical waveguide including a second light amplification medium; a first excitation light introducing circuit for introducing first excitation light for exciting the first light amplification medium into the first optical waveguide; and a first residual excitation light introducing circuit for introducing first residual excitation light which is output from the first optical waveguide and has a wavelength component of the first excitation light, into the second optical waveguide.

    Laser pulse energy amplification device and method, and femtosecond laser
    22.
    发明授权
    Laser pulse energy amplification device and method, and femtosecond laser 有权

    公开(公告)号：US11955762B2

    公开(公告)日：2024-04-09

    申请号：US18026133

    申请日：2021-09-08

    Applicant: FEMTOSECOND RESEARCH CENTER CO., LTD.

    Inventor： Bingwei Xu ,  Xin Zhu

    IPC: H01S3/00 ,  G02F1/365 ,  H01S3/067 ,  H01S3/094

    CPC classification number: H01S3/0057 ,  G02F1/365 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094076

    Abstract: A laser pulse energy amplification device and method, and a femtosecond laser are provided. The laser pulse energy amplification device includes a pulse amplifier and a pulse shaper that are connected in sequence. The pulse amplifier is connected to an output port of a seed laser source and is connected to the pulse shaper that outputs a femtosecond laser pulse. The seed laser source is configured to generate and input a seed laser pulse to the pulse amplifier. The pulse amplifier is configured to introduce a nonlinear phase shift into the seed laser pulse, perform energy amplification and spectral stretching, and output an energy-amplified laser pulse with a nonlinear phase to the pulse shaper. The pulse shaper is configured to measure a shape and/or the nonlinear phase of the energy-amplified laser pulse, and shape the energy-amplified laser pulse according to the shape and/or the nonlinear phase.

    Laser
    26.
    发明授权
    Laser 有权

    公开(公告)号：US11876340B2

    公开(公告)日：2024-01-16

    申请号：US17625780

    申请日：2019-12-26

    Applicant: SHANGHAI INSTITUTE OF MICROSYSTEM AND INFORMATION TECHNOLOGY, CHINESE ACADEMY OF SCIENCES

    Inventor： Shan Qiao ,  Zhinan Zeng ,  Xiaoyan Liang

    IPC: H01S3/23 ,  H01S3/094 ,  H01S3/22

    CPC classification number: H01S3/2316 ,  H01S3/094096 ,  H01S3/2207

    Abstract: The present invention provides a laser, including: a medium, having a ground state, an intermediate state, and an excited state in ascending order of energy; an excitation system, configured to excite electrons in the medium from the ground state to the intermediate state; and an excitation laser, configured to drive electrons in the intermediate state at different spatial positions in the medium to the ground state through a stimulated emission process with a fixed phase relationship, to generate a laser with a shorter relative wavelength. Due to the use of an excitation laser to drive electrons from the intermediate state, the photons generated by the stimulated emission have coherence, thereby forming a laser. In the present invention, an excitation system performing primary pumping combined with an excitation laser with a relatively long wavelength performing secondary pumping generate lasers with a relatively short wavelength, and the structure of the short-wavelength laser is simple, compact, and easy to be implemented. In addition, the cost of the short-wavelength laser can be reduced, and a laser with a shorter wavelength can be obtained.

    Efficient in-band pumping of Holmium-doped optical fiber amplifiers
    27.
    发明授权
    Efficient in-band pumping of Holmium-doped optical fiber amplifiers 有权

    公开(公告)号：US11870205B2

    公开(公告)日：2024-01-09

    申请号：US16929072

    申请日：2020-07-14

    Applicant: Cybel, LLC.

    Inventor： Robert E. Tench ,  Jean-Marc Delavaux

    IPC: H01S3/067 ,  H01S3/094 ,  H01S3/16

    CPC classification number: H01S3/06716 ,  H01S3/06712 ,  H01S3/06733 ,  H01S3/06754 ,  H01S3/094011 ,  H01S3/094042 ,  H01S3/094076 ,  H01S3/161 ,  H01S3/1616

    Abstract: A fiber-based optical amplifier for operation at an eye-safe input signal wavelength λS within the 2 μm region is formed to include a section of Holmium (Ho)-doped optical gain fiber. The pump source for the fiber amplifier is particularly configured to provide pump light at a wavelength where the absorption coefficient of the Ho-doped optical gain fiber exceeds its gain coefficient (referred to as an “absorption-dominant pump wavelength”), and is typically within the range of 1800-1900 nm. The selection of an absorption-dominant pump wavelength limits the spontaneous emission of the pump from affecting the amount of gain achieved at the higher wavelength end of the operating region. The amount of crosstalk between the signal wavelength and pump wavelength is also reduced (in comparison to using the conventional 1940 nm pump wavelength).

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