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    MODULAR, HIGH ENERGY, WIDELY-TUNABLE AND ULTRAFAST FIBER SOURCE
    31.
    发明专利
    MODULAR, HIGH ENERGY, WIDELY-TUNABLE AND ULTRAFAST FIBER SOURCE 失效

    公开(公告)号：JP2002118315A

    公开(公告)日：2002-04-19

    申请号：JP2001154396

    申请日：2001-05-23

    Applicant: IMRA AMERICA INC

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

    IPC: G02B6/02 ,  G02F1/35 ,  G02F1/37 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/109 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30 ,  G02B6/10

    Abstract: PROBLEM TO BE SOLVED: To provide a modular, compact and widely-tunable laser system for efficiently generating a high peak ultrashort pulses. SOLUTION: System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Peak power handling capability of the fiber amplifiers is expanded by using optimizing pulse shapes as well as dispersively broadened pulses. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. After amplification, the dispersively stretched pulses can be recompressed to nearly band width limit by the implementation of another set of dispersive delay lines. To ensure a wide tunability of the whole system, Raman-shifting of the compact sources of ultrashort pulses in conjunction with frequency-conversion in nonlinear optical crystals can be implemented. Further, a positively dispersing optical amplifier and a Raman amplifier fiber are utilized.

    LIGHT PULSE AMPLIFYING DEVICE, CHIRP PULSE AMPLIFYING DEVICE, AND PARAMETRIC CHIRP PULSE AMPLIFYING DEVICE
    32.
    发明专利
    LIGHT PULSE AMPLIFYING DEVICE, CHIRP PULSE AMPLIFYING DEVICE, AND PARAMETRIC CHIRP PULSE AMPLIFYING DEVICE 失效

    公开(公告)号：JPH10268369A

    公开(公告)日：1998-10-09

    申请号：JP6889298

    申请日：1998-03-18

    Applicant: IMRA AMERICA INC

    Inventor： GALVANAUSKAS ALMANTAS DR ,  HARIHARAN ANAND DR ,  HARTER DONALD J DR

    IPC: G02F1/35 ,  B23K26/06 ,  B23K26/40 ,  G02F1/39 ,  H01S3/00 ,  H01S3/06 ,  H01S3/10 ,  H01S3/108 ,  H01S3/115

    Abstract: PROBLEM TO BE SOLVED: To provide a small-sized amplifier for ultrashort pulses of high energy. SOLUTION: This light pulse amplifying device has an excitation source 100 which generates an exciting light pulse with specific continuation, a signal source 130 which generates a signal light pulse, an optical combining means 160 which combines both the light pulses together to generate a combined light pulse, a parametric amplifier 170 having a quasi-phase matching crystal which photodetects the combined light pulse and amplifies the signal pulse with the energy of the exciting light pulse, and a compressor 180 which compresses the amplified signal pulse. The parametric amplifier 170 performs parametric chirp pulse amplification and the powerful amplification of the signal light pulse can be performed even with an exciting light pulse with low peak power, so the ultrashort light pulse with high energy is outputted from the compressor 180.

    PASSIVE HARMONIC DIVIDED MODE-LOCKED LASER
    34.
    发明专利
    PASSIVE HARMONIC DIVIDED MODE-LOCKED LASER 失效

    公开(公告)号：JPH0864893A

    公开(公告)日：1996-03-08

    申请号：JP18255894

    申请日：1994-08-03

    Applicant: IMRA AMERICA INC ,  UNIV MICHIGAN

    Inventor： MAACHIN II FUAAMAN ,  DONARUDO JIEI HAATAA

    IPC: H01S3/07 ,  H01S3/06 ,  H01S3/067 ,  H01S3/082 ,  H01S3/098 ,  H01S3/16

    Abstract: PURPOSE: To eliminate instabilities from such use of additional cavity, for attaining a stable mode-locking by dividing into a first distance which is longer than a second distance and providing a saturation absorber which generates a passive mode-locking. CONSTITUTION: A saturation absorber 210 divides a vertical axis 204 of a cavity 200 into first and second distances. The distance from a first cavity mirror 206 to the saturation absorber 210 is selected so as to be n-times that from the saturation absorber 210 to a second cavity mirror 208. As a result, only when the pulse is moving from a gain medium 202 to the second cavity mirror 208 colliding with the reverse propagating pulse moving from the second cavity mirror 208 to the gain medium 202 at the saturation absorber 210, does a pulse pass by the saturation absorber 210 to generate mode-lock operation. Thereby, instabilities from such as in the case of the use of additional cavity is eliminated, so that stable mode-lock is attained.

    DEVICE FOR SUPPLY-SENDING MULTILEVEL ELECTRIC POWER, AND VEHICLE HAVING THE SAME
    35.
    发明专利
    DEVICE FOR SUPPLY-SENDING MULTILEVEL ELECTRIC POWER, AND VEHICLE HAVING THE SAME 失效

    公开(公告)号：JPH07131933A

    公开(公告)日：1995-05-19

    申请号：JP25086893

    申请日：1993-10-06

    Applicant: IMRA AMERICA INC

    Inventor： PIITAA EE HOTSUFUSUTAIN ,  UEHARA YUZURU

    IPC: F01N3/20 ,  B01D53/86 ,  F01N9/00 ,  H01M10/44 ,  H02J1/00 ,  B01D53/87

    Abstract: PURPOSE: To supply multiple level voltages which is suitable for respective loads and reduce power losses caused by the load currents of high-voltage drive elements. CONSTITUTION: A fundamental construction has a DC power supply 100, which outputs a 1st level voltage and a voltage multiplier increasing the 1st level voltage to a 2nd level voltage which is higher than the 1st level voltage. The voltage multiplier includes a switching means, which supplies the 1st level voltage and 2nd level voltage of the DC power supply to low-voltage drive elements and high-voltage elements respectively and capacitive devices 150 and 160, such as capacitors or voltage storage devices such as batteries, cells, etc., which are switched and connected by a switching means.

    Rare earth doped and large effective area optical fibers for fiber lasers and fiber amplifiers
    37.
    发明专利
    Rare earth doped and large effective area optical fibers for fiber lasers and fiber amplifiers 有权
    用于光纤激光器和光纤放大器的稀土接地和大面积有效面积的光纤

    公开(公告)号：JP2013102170A

    公开(公告)日：2013-05-23

    申请号：JP2012278092

    申请日：2012-12-20

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

    Inventor： DONG LIANG ,  XIAN PENG

    IPC: H01S3/067 ,  C03C13/04 ,  G02B6/00 ,  G02B6/02 ,  G02B6/036

    Abstract: PROBLEM TO BE SOLVED: To provide glass that enables a large-diameter core and/or high doping.SOLUTION: Various embodiments described herein include rare earth doped glass compositions that may be used in optical fibers and rods having large core sizes. Such optical fibers and rods may be employed in fiber lasers and fiber amplifiers. The index of refraction of the glass may be substantially uniform and may be close to that of silica in some embodiments. Feasible advantages of these features include reduction of formation of additional waveguides within the core, which becomes increasingly problematic with larger core sizes.

    Abstract translation: 要解决的问题：提供能够实现大直径芯和/或高掺杂的玻璃。 解决方案：本文描述的各种实施方案包括可用于具有大芯尺寸的光纤和棒的稀土掺杂玻璃组合物。 这种光纤和棒可以用在光纤激光器和光纤放大器中。 在一些实施方案中，玻璃的折射率可以是基本均匀的并且可以接近二氧化硅的折射率。 这些特征的可行优点包括减少芯内附加波导的形成，这在较大的芯尺寸上变得越来越成问题。 版权所有（C）2013，JPO＆INPIT

    Apparatus and method for generating high power optical pulses
    39.
    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
    40.
    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

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