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    Apparatus and method for generating high power optical pulses
    2.
    发明专利
    Apparatus and method for generating high power optical pulses 有权
    用于产生高功率光学脉冲的装置和方法

    公开(公告)号：JP2009265683A

    公开(公告)日：2009-11-12

    申请号：JP2009163251

    申请日：2009-07-10

    Applicant: Imra America Inc ,  イムラ アメリカ インコーポレイテッド

    Inventor： FERMANN MARTIN E ,  GALVANAUSKAS ALMANTAS DR ,  HARTER DONALD J DR

    IPC: G02F1/35 ,  G02F1/37 ,  G02B6/024 ,  G02B6/036 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/109 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30

    CPC classification number: H01S3/06754 ,  G02F1/37 ,  G02F2001/3542 ,  G02F2001/3548 ,  H01S3/06712 ,  H01S3/06758 ,  H01S3/1603 ,  H01S3/2333 ,  H01S3/302 ,  H01S2301/085

    Abstract: PROBLEM TO BE SOLVED: To provide a means for generating femto-second high power optical pulses. SOLUTION: An apparatus for generating high power optical pulses includes: a fiber oscillator 10 for generating signal light; an amplifier fiber 11 with non-linear phase delay, which collects the signal light, and which serves as a Soliton Raman compressor (SRC) for amplifying and compressing it; and a periodical poled LiNbO 3 (PRLN) 20, which is a frequency converter for performing frequency conversion on amplified optical pulses to make high power optical pulses. Dispersion is compensated by a dispersion compensated fiber 18. The optical pulse is reflected by a Faraday rotation mirror (FRM) 19 and a double path is configured. The signal light is amplified and compressed by obtaining energy from pump light injected from a pump 16, and a femto-second high power optical pulse is obtained with a wavelength in which the frequency conversion is performed by the PRLN frequency converter 20. COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题：提供用于产生毫微微秒级大功率光脉冲的装置。 解决方案：用于产生高功率光脉冲的装置包括：用于产生信号光的光纤振荡器10; 具有非线性相位延迟的放大器光纤11，其收集信号光，并且其用作用于放大和压缩的Soliton拉曼压缩器（SRC）; 以及作为用于对放大的光脉冲进行频率转换以进行高功率光脉冲的频率转换器的周期性极化LiNbO 3 SBR（PRLN）20。 色散由色散补偿光纤18补偿。光脉冲由法拉第旋转镜（FRM）19反射并且配置双路径。 信号光通过从泵16注入的泵浦光获得能量而被放大和压缩，并且获得具有由PRLN变频器20进行频率转换的波长的毫微微秒级大功率光脉冲。 版权所有（C）2010，JPO＆INPIT

    Integrated passively modelocked fiber lasers and method for constructing it
    3.
    发明专利
    Integrated passively modelocked fiber lasers and method for constructing it 有权
    集成的普通型模拟光纤激光器及其构造方法

    公开(公告)号：JP2008294471A

    公开(公告)日：2008-12-04

    申请号：JP2008204282

    申请日：2008-08-07

    Applicant: Imra America Inc ,  イムラ アメリカ インコーポレイテッド

    Inventor： FERMANN MARTIN E ,  HARTER DONALD J DR

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/098 ,  H01S3/10

    CPC classification number: H01S3/1118 ,  H01S3/067

    Abstract: PROBLEM TO BE SOLVED: To achieve stable operation of an ultra-compact modelocked fiber laser generating short optical pulses generally without use of any non-fiber, intra-cavity polarization-manipulating elements. SOLUTION: Once the laser is modelocked in one of the polarization axes of the highly-birefringent fiber, the degeneracy of the polarization axis is eliminated and cw oscillation along the other polarization axis is also prevented. Without a polarization-dependent loss in the cavity, the modelocked polarization axis is indeterminate, i.e., modelocking can occur on either of the polarization axes. However, the introduction of only a small polarization dependent loss is sufficient to ensure the reliable start-up of modelocking on only the low-loss axis. Such a small polarization dependent loss can be introduced by tightly coiling the highly-birefringent fiber, which generates a higher loss along the fast axis; thus, reliable modelocked operation along the slow axis is obtained. Alternatively, single polarization operation is obtained by employing a saturable absorber with a polarization-dependent loss or by introducing polarization-manipulating elements external to the laser cavity. COPYRIGHT: (C)2009,JPO&INPIT

    Abstract translation: 要解决的问题：为了实现通常不使用任何非光纤腔内偏振操作元件的产生短光脉冲的超紧凑型锁模光纤激光器的稳定操作。 解决方案：一旦激光器被模式锁定在高双折射光纤的偏振轴之一中，就消除了偏振轴的简并性，并且也防止了沿着另一个偏振轴的cw振荡。 在空腔中没有偏振相关损耗的情况下，锁模偏振轴是不确定的，即在任何一个偏振轴上均可发生锁模。 然而，仅引入小的偏振相关损耗就足以确保仅在低损耗轴上可靠地启动锁模。 可以通过紧密卷绕高双折射纤维来引入这种小的偏振相关损耗，从而沿着快轴产生较高的损耗; 从而获得沿着慢轴可靠的锁模操作。 或者，通过采用具有偏振相关损耗的可饱和吸收体或通过在激光腔外部引入偏振控制元件来获得单极化操作。 版权所有（C）2009，JPO＆INPIT

    High power chirped pulse amplifier, and compressor
    4.
    发明专利
    High power chirped pulse amplifier, and compressor 审中-公开
    高功率脉冲放大器和压缩机

    公开(公告)号：JP2008034867A

    公开(公告)日：2008-02-14

    申请号：JP2007245302

    申请日：2007-09-21

    Applicant: Imra America Inc ,  イムラ アメリカ インコーポレイテッド

    Inventor： HARTER DONALD J ,  GALVANAUSKAS ALMANTAS ,  FERMANN MARTIN E

    IPC: G02F1/35 ,  H01S3/10 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/23

    CPC classification number: H01S3/06708 ,  H01S3/0057 ,  H01S3/06729 ,  H01S3/06754 ,  H01S3/094003 ,  Y10S372/703

    Abstract: PROBLEM TO BE SOLVED: To provide a miniaturized and inexpensive high output chirped pulse amplifier of 100 mW-10 W, and a compressor suitable for the same. SOLUTION: This high output chirped pulse amplifier which generates ultrashort pulses includes a generation source 10 for generating expanded pulses which are expanded pulse lights, an output amplifying stage 20 for amplifying the expanded pulses, the compressor 40 for receiving the expanded pulses from the output amplifying stage 20 to compress them, wherein the output amplifying stage 20 has a double cladding fiber and a pump. The compressor 40 is preferable to have a fiber grid for compressing laser pulse signals into the duration of less than a threshold in a nonlinear effect, and a diffraction grating for accepting pulse signals compressed through the fiber grid in order to further compress the pulse signals. The chirped pulse amplifying action of cladding-pumped fiber allows the chirped pulse amplification of high output to be performed while it is miniaturized and inexpensive. COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题：提供100mW-10W的小型化和廉价的高输出啁啾脉冲放大器和适用于其的压缩机。 解决方案：产生超短脉冲的高输出啁啾脉冲放大器包括用于产生扩展脉冲的扩展脉冲的发生源10，用于放大扩展脉冲的输出放大级20，用于接收扩展脉冲的压缩器40 输出放大级20进行压缩，其中输出放大级20具有双包层光纤和泵。 压缩机40优选具有用于在非线性效应中将激光脉冲信号压缩到小于阈值的持续时间的光纤网格，以及用于接受通过光纤网格压缩的脉冲信号的衍射光栅，以便进一步压缩脉冲信号。 包层泵浦光纤的啁啾脉冲放大作用允许在小型化和便宜的情况下执行高输出的啁啾脉冲放大。 版权所有（C）2008，JPO＆INPIT

    In-line, high energy fiber chirped pulse amplification system
    6.
    发明专利
    In-line, high energy fiber chirped pulse amplification system 审中-公开
    在线，高能量纤维激光脉冲放大系统

    公开(公告)号：JP2013168681A

    公开(公告)日：2013-08-29

    申请号：JP2013112938

    申请日：2013-05-29

    Applicant: Imra America Inc ,  イムラ アメリカ インコーポレイテッド

    Inventor： FERMANN MARTIN E ,  IMESHEV GENNADY ,  HARTL INGMAR ,  HARTER DONALD J DR

    IPC: H01S3/067 ,  G02B6/26 ,  H01S20060101 ,  H01S3/00 ,  H01S3/10 ,  H01S3/23

    CPC classification number: H01S3/06754 ,  H01S3/005 ,  H01S3/0057 ,  H01S3/0085 ,  H01S3/0092 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/094007 ,  H01S3/10015

    Abstract: PROBLEM TO BE SOLVED: To provide a highly productive fiber chirped pulse amplification system which exhibits a high pulse stretching ratio and a high pulse compression ratio.SOLUTION: A polarization maintaining air-clad fiber comprises: a core region; a material cladding region surrounding the core; air cladding which substantially surrounds the material cladding region; and a layer surrounding the air cladding. A polarization maintaining operation of the fiber is achieved by incorporating stress producing regions, which generate stress-induced birefringence in the air-clad fiber and are disposed completely inside the material cladding region and surrounded completely by the material cladding region.

    Abstract translation: 要解决的问题：提供具有高脉冲拉伸比和高脉冲压缩比的高效率的光纤啁啾脉冲放大系统。解决方案：一种偏振保持型空气包层光纤包括：芯区; 围绕芯的材料包层区域; 基本上围绕材料包层区域的空气包层; 以及围绕空气包层的层。 通过在空气包层光纤中引入应力引起的双折射的应力产生区域并且完全设置在材料包层区域内并被材料包层区域完全包围的方式来实现光纤的偏振维持操作。

    SINGLE POLARIZATION HIGH-POWER FIBER LASER AND AMPLIFIER
    7.
    发明专利
    SINGLE POLARIZATION HIGH-POWER FIBER LASER AND AMPLIFIER 审中-公开

    公开(公告)号：JP2002323636A

    公开(公告)日：2002-11-08

    申请号：JP2002072975

    申请日：2002-03-15

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E ,  HARTER DONALD J DR

    IPC: G02B6/02 ,  G02B6/024 ,  G02B6/036 ,  G02B6/44 ,  H01S3/06 ,  H01S3/067 ,  H01S3/098 ,  H01S3/10 ,  G02B6/17 ,  G02B6/10 ,  G02B6/22

    Abstract: PROBLEM TO BE SOLVED: To provide a fiber which is decreased in the amount of polarization mode coupling and polarization mode dispersion and is increased in polarization maintaining ability and to provide a polarization maintaining high-efficiency fiber amplifier or laser of such a large external diameter that pumping light is guided within an inner clad while a larger outer clad ensures the decrease of the mode coupling in the fiber core. SOLUTION: The high-power polarization maintaining fiber taking the degree of the double refraction of the core, the sectional shape of the clad and the shape for polarization maintaining into consideration is decreased in the stress in the fiber core by increasing the fiber diameter to minimize the polarization mode coupling, by which the polarization mode coupling is minimized and the insensibility of the polarization state with respect to bending and temperature changing of the fiber on the outer side is achieved or the polarization mode coupling is minimized by optimization of the fiber coating in order to minimize the stress at the boundary between the fiber and the coating and eventually the insensibility to the polarization mode coupling is obtained by the value of the double refractivity drastically decreased as compared with the fiber of a small diameter.

    MODE-LOCKED MULTI-MODE FIBER LASER PULSE SOURCE
    8.
    发明专利
    MODE-LOCKED MULTI-MODE FIBER LASER PULSE SOURCE 失效

    公开(公告)号：JP2000200931A

    公开(公告)日：2000-07-18

    申请号：JP33491499

    申请日：1999-11-25

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/098

    Abstract: PROBLEM TO BE SOLVED: To greatly increase peak power limit of usual mode-locked single mode fiber laser by using a resonator design, which enables stable generation of high peak power pulse from a mode-locked multi-mode fiber laser. SOLUTION: Light from a pump light source 51, such as a laser light source having a wavelength close to 980 nm and an output power of 5 W is injected through a fiber flux 57. The pump light is injected to an end part 53 of a multi- mode fiber 13 which is relevant to a single mode fiber 17. A pumping light is coupled to a resonator 11 by a pump signal injector 55, such as a two-color beam splitter for wavelength of 980/1550 nm. Lenses 47, 48 are optimized for coupling pump power from a fiber 57 to cladding of a multi-mode fiber. Therefore, peak pulse power at a mode-locked pulse light source used for generating ultrashort light pulse is increased.

    INTEGRATED PASSIVELY MODELOCKED FIBER LASER AND METHOD FOR CONSTRUCTING THE SAME
    9.
    发明专利
    INTEGRATED PASSIVELY MODELOCKED FIBER LASER AND METHOD FOR CONSTRUCTING THE SAME 失效

    公开(公告)号：JPH11284264A

    公开(公告)日：1999-10-15

    申请号：JP3344099

    申请日：1999-02-10

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E ,  HARTER DONALD J DR

    IPC: H01S3/06 ,  H01S3/067 ,  H01S3/098 ,  H01S3/10

    Abstract: PROBLEM TO BE SOLVED: To minimize the manufacturing cost of a passively modelocked fiber laser of high reliability by employing saturable absorber together with a highly- birefringent erbium doped optical fiber. SOLUTION: A WDM coupler 22 is arranged in a pig tail 18 between a laser diode 16 and an annular splice 20. A signal light entering the pig tail 18 through a dichroic mirror 14 from a fiber 12 is isolated from a pump by the WDM coupler 22, and directed toward an output part. A semiconductor saturable absorber mirror 24 is arranged on the other end of a highly- birefringent fiber 12. The fiber is made to abut against the mirror 24 and bonded to it. Low power reflectivity larger than 80% and carrier life of 10 psec can be obtained. That is, when a pumping laser is switched on several times, a modelocked operation along either of two polarization axes can be observed while being accompanied by random distribution between the two axes.

    OPTICAL AMPLIFIER
    10.
    发明专利
    OPTICAL AMPLIFIER 失效

    公开(公告)号：JPH1174593A

    公开(公告)日：1999-03-16

    申请号：JP17575598

    申请日：1998-06-23

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E ,  HARTER DONALD J DR

    IPC: H01S3/10 ,  G02F1/37 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/094 ,  H01S3/23 ,  H04B10/02 ,  H04B10/18

    Abstract: PROBLEM TO BE SOLVED: To generate a peak intensity and pulse energy larger than those achieved with a single mode(SM) fiber, by raising a capacity for accumulating energy in an optical fiber amplifier before a desirable non-linearity and gain saturation start. SOLUTION: The optical amplifier device comprises a fiber oscillator 10 which, as a laser source, generates such an input beam as comprises a mode close to diffraction limit, a multiplex mode fiber amplifier 12, a mode converter 14, and a pump source 20. The mode converter 14, receiving an input beam, converts the mode of input beam so that it conforms to a basic mode of the multiplex mode fiber amplifier 12 for generating a mode-converted input beam to be inputted in the multiplex mode fiber amplifier 12. The pump source 20 optically pumps the multiplex mode fiber amplifier 12, to generate a strong output beam amplified, intrinsically, with the basic mode.

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