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    FIBER LASER SYSTEM, PRODUCTION METHOD, AND PROCESSING METHOD
    2.
    发明公开
    FIBER LASER SYSTEM, PRODUCTION METHOD, AND PROCESSING METHOD 审中-公开

    公开(公告)号：EP3223377A4

    公开(公告)日：2018-01-10

    申请号：EP16838079

    申请日：2016-11-24

    Applicant: FUJIKURA LTD

    Inventor： KASHIWAGI MASAHIRO

    IPC: H01S3/067 ,  B23K26/064 ,  H01S3/00 ,  H01S3/23

    CPC classification number: B23K26/064 ,  H01S3/00 ,  H01S3/067 ,  H01S3/2383

    Abstract: The present invention achieves a fiber laser having a high reflection resistance. A length of an optical fiber MMF is set so that a condition is satisfied at each point on an individual optical path of a fiber laser (FL2), the condition being that a difference between time at which a power of a forward Stokes beam (SF) is at a maximum value and time at which a power of a backward Stokes beam (SB) is at a maximum value is greater than a sum of a half width at half maximum of the power of the forward Stokes beam (SF) and a half width at half maximum of the power of the backward Stokes beam (SB).

    FIBER LASER SYSTEM
    6.
    发明公开
    FIBER LASER SYSTEM 审中-公开

    公开(公告)号：EP3193413A4

    公开(公告)日：2017-12-27

    申请号：EP16840274

    申请日：2016-10-26

    Applicant: FUJIKURA LTD

    Inventor： KASHIWAGI MASAHIRO

    IPC: H01S3/067 ,  G02B6/02 ,  H01S3/23

    CPC classification number: H01S3/2391 ,  G02B6/02 ,  H01S3/067

    Abstract: A fiber laser system enables an improved reflection resistance property. The fiber laser system includes fiber lasers (2 through 4) each having a laser medium which is an optical fiber made from silica glass. A difference between respective lasing wavelengths of any given two of the fiber lasers is greater than a wavelength equivalent to a half width at half maximum of a peak deriving from a vibration mode of a planar four-membered ring of a Si-O network structure of silica glass.

    PHOTONIC BANDGAP FIBER AND FIBER LASER DEVICE USING SAME
    7.
    发明公开
    PHOTONIC BANDGAP FIBER AND FIBER LASER DEVICE USING SAME 有权
    PHOTONENBANDLÜCKENFASERUND FASERLASERVORRICHTUNG DAMIT

    公开(公告)号：EP2975704A4

    公开(公告)日：2017-06-28

    申请号：EP14762525

    申请日：2014-01-31

    Applicant: FUJIKURA LTD ,  NAT UNIV CORP HOKKAIDO UNIV

    Inventor： KASHIWAGI MASAHIRO ,  SAITOH KUNIMASA

    IPC: H01S3/067 ,  G02B6/02 ,  H01S3/094 ,  H01S3/0941

    CPC classification number: H01S3/06741 ,  G02B6/02309 ,  G02B6/02323 ,  G02B6/02347 ,  H01S3/0675 ,  H01S3/094003 ,  H01S3/09408 ,  H01S3/0941

    Abstract: There is provided a photonic bandgap fiber used in a state in which at least a part of the photonic bandgap fiber is bent at radii of 15 cm or greater and 25 cm or less. A large number of high refractive index portions 57 are disposed in a nineteen-cell core type in three layers, and a V value is 1.5 or greater and 1.63 or less. In the high refractive index portions 57, conditions are defined that a relative refractive index difference is ”% and a lattice constant is A µm so as to remove light in a higher mode at the bent portion as described above.

    Abstract translation: 提供了一种光子带隙光纤，该光子带隙光纤用于至少一部分光子带隙光纤以15厘米或更大和25厘米或更小的半径弯曲的状态。 大量的高折射率部分57以三层的19单元芯型配置，V值为1.5以上且1.63以下。 在高折射率部分57中，将如上所述的条件定义为相对折射率差为“％”且晶格常数为Aμm，以在弯曲部分以较高模式去除光。

    OPTICAL FIBER, FIBER AMPLIFIER, AND FIBER LASER
    10.
    发明公开
    OPTICAL FIBER, FIBER AMPLIFIER, AND FIBER LASER 审中-公开
    GLASFASER，FASERVERSTÄRKERUND FASERLASER

    公开(公告)号：EP3176886A4

    公开(公告)日：2017-08-23

    申请号：EP16761683

    申请日：2016-03-04

    Applicant: FUJIKURA LTD

    Inventor： KASHIWAGI MASAHIRO

    IPC: H01S3/067 ,  G02B6/036 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/16

    CPC classification number: H01S3/06733 ,  G02B6/036 ,  G02B6/03661 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/09408 ,  H01S3/09415 ,  H01S3/1618 ,  H01S3/1691

    Abstract: Provided is an optical fiber (1) including a low-refractive-index layer (22) that is disposed between a first cladding (21) and a second cladding (23) and that has a refractive index between those of the first and second claddings (21) and (23). The first cladding (21) has a cladding diameter that is 2.5 or more times the MFD of the fundamental mode at a fluorescence wavelength of an active element in a core (10), and the low-refractive-index layer (21) has a thickness that is equal to or more than an absorption wavelength of the active element.

    Abstract translation: 本发明提供一种光纤（1），其包括布置在第一包层（21）和第二包层（23）之间并具有介于第一包层和第二包层之间的折射率的低折射率层（22） （21）和（23）。 第一包层（21）具有在芯（10）中的有源元件的荧光波长处的基模的MFD的2.5倍或更多倍的包层直径，并且低折射率层（21）具有 厚度等于或大于有源元件的吸收波长。

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