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    CHIRPED PULSE AMPLIFIER FOR A FIBER OPTIC SYSTEM
    61.
    发明公开
    CHIRPED PULSE AMPLIFIER FOR A FIBER OPTIC SYSTEM 审中-公开

    公开(公告)号：EP3410548A1

    公开(公告)日：2018-12-05

    申请号：EP18184271.7

    申请日：2004-05-25

    Applicant: IMRA America, Inc.

    Inventor： GU, Xinhua ,  UEHARA, Yuzuru ,  HARTER, Donald J.

    IPC: H01S3/00 ,  H01S4/00 ,  H01S3/10

    Abstract: A chirped pulse amplifier for a fiber optic system is described. In an embodiment, the amplifier comprises a mode-locked laser (70), a polarization-maintaining device (70) coupled to an output of the mode-locked laser; a pulse stretcher and a pre-amplifier fiber (74) coupled to a first output of the polarization-maintaining device (70), a first pulse selector (77) coupled to a second output of the polarization-maintaining device (70), an amplifier (78) coupled to the first pulse selector (77), and a compressor (79) coupled to an output of the amplifier (78).

    PRODUCTION OF NANOPARTICLES WITH HIGH REPETITION RATE ULTRASHORT PULSED LASER ABLATION IN LIQUIDS
    62.
    发明授权
    PRODUCTION OF NANOPARTICLES WITH HIGH REPETITION RATE ULTRASHORT PULSED LASER ABLATION IN LIQUIDS 有权
    高重复率超声波脉冲激光烧蚀纳米颗粒的制备

    公开(公告)号：EP2391455B1

    公开(公告)日：2018-05-09

    申请号：EP09839437.2

    申请日：2009-03-19

    Applicant: Imra America, Inc.

    Inventor： LIU, Bing ,  HU, Zhendong ,  MURAKAMI, Makoto ,  CHE, Yong

    IPC: B02C19/00

    CPC classification number: B02C19/18 ,  B01J13/0043 ,  B01J19/121 ,  B22F1/0022 ,  B22F9/04 ,  B22F2999/00 ,  B82Y30/00 ,  B22F2202/11

    Abstract: Various embodiments include a method of producing chemically pure and stably dispersed metal and metal-alloy nanoparticle colloids with ultrafast pulsed laser ablation. A method comprises irradiating a metal or metal alloy target submerged in a liquid with ultrashort laser pulses at a high repetition rate, cooling a portion of the liquid that includes an irradiated region, and collecting nanoparticles produced with the laser irradiation and liquid cooling. The method may be implemented with a high repetition rate ultrafast pulsed laser source, an optical system for focusing and moving the pulsed laser beams, a metal or metal alloy target submerged in a liquid, and a liquid circulating system to cool the laser focal volume and collect the nanoparticle products. By controlling various laser parameters, and with optional liquid flow movement, the method provides stable colloids of dispersed metal and metal-alloy nanoparticles. In various embodiments additional stabilizing chemical agents are not required.

    POLARIZING AND POLARIZATION MAINTAINING LEAKAGE CHANNEL FIBERS
    64.
    发明公开
    POLARIZING AND POLARIZATION MAINTAINING LEAKAGE CHANNEL FIBERS 审中-公开
    偏光功能及极化维持泄漏通道纤维

    公开(公告)号：EP3072002A1

    公开(公告)日：2016-09-28

    申请号：EP14802547.1

    申请日：2014-11-05

    Applicant: IMRA America, Inc.

    Inventor： SUZUKI, Shigeru ,  MCKAY, Hugh A ,  FERMANN, Martin E.

    IPC: G02B6/036 ,  G02B6/02 ,  G02B6/10

    CPC classification number: G02B6/024 ,  G02B6/02009 ,  G02B6/02042 ,  G02B6/02314 ,  G02B6/02319 ,  G02B6/02342 ,  G02B6/02357 ,  G02B6/03694

    Abstract: This disclosure relates to polarizing optical fibers and polarization maintaining optical fibers, including active and/or passive implementations. An embodiment includes a polarizing (PZ) optical fiber that includes stress applying parts (SAPs) disposed in a first cladding region, the SAPs comprising a material with a thermal expansion coefficient, αSAP. A core region is at least partially surrounded by cladding features and the SAPs. The core includes glass with a thermal expansion coefficient, αcore. The arrangement of the SAPs satisfies: Rsc=dSAP/Dsc, where Dsc is the SAP center to core center distance, and dSAP is the average SAP diameter, and dα=|αSAP−αcore|, and where Rsc and dα may be sufficiently large to induce stress birefringence into the core and to provide for polarized output. Active fibers in which a portion of the fiber is doped may be implemented for application in fiber lasers, fiber amplifiers, and/or optical pulse compressors.

    INEXPENSIVE VARIABLE REP-RATE SOURCE FOR HIGH-ENERGY, ULTRAFAST LASERS
    65.
    发明公开
    INEXPENSIVE VARIABLE REP-RATE SOURCE FOR HIGH-ENERGY, ULTRAFAST LASERS 审中-公开
    KOSTENGÜNSTIGEQUELLE MIT VARIABLER IMPULSFOLGEFREQUENZFÜRULTRASCHNELLE HOCHLEISTUNGSLASER

    公开(公告)号：EP3070793A1

    公开(公告)日：2016-09-21

    申请号：EP16154800.3

    申请日：2004-05-14

    Applicant: IMRA America, Inc.

    Inventor： Harter, Donald J. ,  Uehara, Yuzuru

    IPC: H01S3/23 ,  H01S3/00 ,  H01S3/067 ,  G02B6/293

    Abstract: System for converting relatively long pulses from rep-rate variable ultrafast optical sources to shorter, high-energy pulses suitable for sources in high-energy ultrafast lasers. Fibers with positive group velocity dispersion (GVD) and self phase modulation are advantageously employed with the optical sources. These systems take advantage of the need for higher pulse energies at lower repetition rates so that such sources can be cost effective.

    Abstract translation: 用于将相对长的脉冲从代表性可变超快光源转换为适用于高能超快激光源的较短，高能脉冲的系统。 与光源有利地使用具有正组速度色散（GVD）和自相位调制的光纤。 这些系统利用对较低重复率的较高脉冲能量的需要，使得这些源可以具有成本效益。

    GLASS LARGE-CORE OPTICAL FIBERS
    69.
    发明公开
    GLASS LARGE-CORE OPTICAL FIBERS 审中-公开
    与大芯光纤玻璃

    公开(公告)号：EP2201415A4

    公开(公告)日：2014-07-02

    申请号：EP08798892

    申请日：2008-08-28

    Applicant: IMRA AMERICA INC

    Inventor： DONG LIANG ,  LI JUN ,  MCKAY HUGH ,  FU LIBIN ,  MARCINKEVICIUS ANDRIUS

    IPC: G02B6/02 ,  G02B6/14 ,  H01S3/067

    CPC classification number: G02B6/0288 ,  G02B6/02009 ,  G02B6/02333 ,  G02B6/02357 ,  G02B6/02361 ,  G02B6/02366 ,  G02B6/02371 ,  G02B6/0283 ,  G02B6/14 ,  H01S3/06729 ,  H01S3/06754 ,  H01S3/091 ,  H01S3/11

    Abstract: Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1−n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10−3. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

    PRODUCTION OF NANOPARTICLES WITH HIGH REPETITION RATE ULTRASHORT PULSED LASER ABLATION IN LIQUIDS
    70.
    发明公开
    PRODUCTION OF NANOPARTICLES WITH HIGH REPETITION RATE ULTRASHORT PULSED LASER ABLATION IN LIQUIDS 有权
    纳米颗粒在与高重复率超短脉冲，脉冲激光烧蚀产液

    公开(公告)号：EP2391455A4

    公开(公告)日：2013-08-07

    申请号：EP09839437

    申请日：2009-03-19

    Applicant: IMRA AMERICA INC

    Inventor： LIU BING ,  HU ZHENDONG ,  MURAKAMI MAKOTO ,  CHE YONG

    IPC: B02C19/00

    CPC classification number: B02C19/18 ,  B01J13/0043 ,  B01J19/121 ,  B22F1/0022 ,  B22F9/04 ,  B22F2999/00 ,  B82Y30/00 ,  B22F2202/11

    Abstract: Various embodiments include a method of producing chemically pure and stably dispersed metal and metal-alloy nanoparticle colloids with ultrafast pulsed laser ablation. A method comprises irradiating a metal or metal alloy target submerged in a liquid with ultrashort laser pulses at a high repetition rate, cooling a portion of the liquid that includes an irradiated region, and collecting nanoparticles produced with the laser irradiation and liquid cooling. The method may be implemented with a high repetition rate ultrafast pulsed laser source, an optical system for focusing and moving the pulsed laser beams, a metal or metal alloy target submerged in a liquid, and a liquid circulating system to cool the laser focal volume and collect the nanoparticle products. By controlling various laser parameters, and with optional liquid flow movement, the method provides stable colloids of dispersed metal and metal-alloy nanoparticles. In various embodiments additional stabilizing chemical agents are not required.

    Abstract translation: 消融各种实施例包括与超快脉冲激光产化学纯和稳定地分散金属和金属合金纳米颗粒胶体的方法。 一种方法包括：照射以高重复率与超短激光脉冲的浸入液体金属或金属合金靶，冷却该液体的一部分确实包括在照射区域，并且收集与所述激光照射和液体冷却产生纳米颗粒。 该方法可以以高重复率的超快脉冲激光源光学系统用于聚焦和移动所述脉冲激光束，在液体浸没的金属或金属合金靶来实现，并且循环系统的液体以冷却激光聚焦体积和 收集纳米产品。 通过控制各种激光参数，并带有可选的液流移动，该方法提供分散的金属和金属合金纳米颗粒的稳定胶体。 在各种实施例不需要额外的稳定的化学试剂。

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