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    Pulsed laser processing with controlled thermal and physical alterations
    2.
    发明申请
    Pulsed laser processing with controlled thermal and physical alterations 有权
    脉冲激光加工具有受控的热和物理改变

    公开(公告)号：US20050218122A1

    公开(公告)日：2005-10-06

    申请号：US10813389

    申请日：2004-03-31

    申请人： Tadashi Yamamoto ,  Donald Harter ,  Rajesh Patel ,  Alan Arai

    发明人： Tadashi Yamamoto ,  Donald Harter ,  Rajesh Patel ,  Alan Arai

    IPC分类号： B23K26/00 ,  B23K26/06

    CPC分类号： B23K26/0624 ,  B23K26/0622

    摘要： A method for laser machining of material using a burst comprised of laser pulses. The method tailors the pulse width, pulse separation duration, wavelength and polarization of the multiple laser pulses included in a burst to maximize the positive effect of thermal and physical changes achieved by previous pulses that have impinged upon the machined material.

    摘要翻译： 使用由激光脉冲组成的脉冲激光加工材料的方法。 该方法调整脉冲包括的脉冲宽度，脉冲间隔持续时间，波长和多个激光脉冲的极化，以最大限度地发挥已经冲击加工材料的先前脉冲实现的热和物理变化的积极作用。

    High power fiber chirped pulse amplification system utilizing telecom-type components
    3.
    发明授权
    High power fiber chirped pulse amplification system utilizing telecom-type components 失效
    大功率光纤啁啾脉冲放大系统利用电信型元件

    公开(公告)号：US07567376B2

    公开(公告)日：2009-07-28

    申请号：US12171780

    申请日：2008-07-11

    申请人： Xinhua Gu ,  Yuzuru Uehara ,  Donald Harter

    发明人： Xinhua Gu ,  Yuzuru Uehara ,  Donald Harter

    IPC分类号： H04B10/17 ,  H01S3/00

    CPC分类号： H01S3/2333 ,  H01S3/0057 ,  H01S3/0085 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/0941 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2316

    摘要： A chirped pulse amplifier (CPA) system having a mode-locked laser and a high-speed pulse selector, wherein the pulse selector modulates output pulses based upon an applied modulation voltage. A pulse selector may be an integrated electro-optic modulator, for example a LiNbO3 modulator, or an electro-absorption modulator. Difficulties related to free-space alignment and operational stability of some prior designs are reduced or eliminated. Fiber coupling generally simplifies beam delivery and alignment. Some embodiments include an erbium fiber (or erbium-ytterbium) based CPA system operating at a wavelength of approximately 1550 nanometers. Similar performance can be obtained at other wavelengths, for example a 1.06 .micrometer Yb-doped fiber system. Moreover, high amplification and peak intensity at the output may be achieved while avoiding non-linear effects in the pulse selector, thereby providing for high intensity picosecond or femtosecond operation.

    摘要翻译： 一种具有锁模激光器和高速脉冲选择器的啁啾脉冲放大器（CPA）系统，其中脉冲选择器基于施加的调制电压来调制输出脉冲。 脉冲选择器可以是集成电光调制器，例如LiNbO 3调制器或电吸收调制器。 减少或消除了一些现有设计中与自由空间对准和操作稳定性相关的困难。 光纤耦合通常简化光束传输和对准。 一些实施例包括以约1550纳米的波长工作的基于铒光纤（或铒 - 镱）的CPA系统。 可以在其他波长下获得类似的性能，例如1.06微米的Yb掺杂的光纤系统。 此外，可以在避免脉冲选择器中的非线性效应的同时实现输出端的高放大和峰值强度，从而提供高强度皮秒或飞秒操作。

    Modular, high energy, widely-tunable ultrafast fiber source
    4.
    发明申请
    Modular, high energy, widely-tunable ultrafast fiber source 有权

    公开(公告)号：US20050163426A1

    公开(公告)日：2005-07-28

    申请号：US11074765

    申请日：2005-03-09

    申请人： Martin Fermann ,  Almantas Galvanauskas ,  Donald Harter

    发明人： Martin Fermann ,  Almantas Galvanauskas ,  Donald Harter

    IPC分类号： G02B6/02 ,  G02F1/35 ,  G02F1/37 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/109 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30 ,  G02B6/34

    CPC分类号： H01S3/1115 ,  H01S3/0057 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094019 ,  H01S3/094042 ,  H01S3/109 ,  H01S3/1112 ,  H01S3/1616 ,  H01S3/1618 ,  H01S3/302

    摘要： A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. 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 optimized 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. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth 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, or an Anti-Stokes fiber in conjunction with fiber amplifiers and Raman-shifters are used. A particularly compact implementation of the whole system uses fiber oscillators in conjunction with fiber amplifiers. Additionally, long, distributed, positive dispersion optical amplifiers are used to improve transmission characteristics of an optical communication system. Finally, an optical communication system utilizes a Raman amplifier fiber pumped by a train of Raman-shifted, wavelength-tunable pump pulses, to thereby amplify an optical signal which counterpropogates within the Raman amplifier fiber with respect to the pump pulses.

    Large core holey fibers
    5.
    发明申请
    Large core holey fibers 有权
    大核心多孔纤维

    公开(公告)号：US20050157998A1

    公开(公告)日：2005-07-21

    申请号：US10844943

    申请日：2004-05-13

    申请人： Liang Dong ,  Donald Harter ,  William Wong

    发明人： Liang Dong ,  Donald Harter ,  William Wong

    IPC分类号： G02B6/02 ,  G02B6/14 ,  G02B6/16

    CPC分类号： G02B6/032 ,  G02B6/02009 ,  G02B6/02047 ,  G02B6/02328 ,  G02B6/02338 ,  G02B6/02342 ,  G02B6/02357 ,  G02B6/02361 ,  G02B6/02366 ,  G02B6/024 ,  G02B6/14 ,  G02B6/32 ,  H01S3/06716 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06741 ,  H01S3/06754

    摘要： Various types of holey fiber provide optical propagation. In various embodiments, for example, a large core holey fiber comprises a cladding region formed by large holes arranged in few layers. The number of layers or rows of holes about the large core can be used to coarse tune the leakage losses of the fundamental and higher modes of a signal, thereby allowing the non-fundamental modes to be substantially eliminated by leakage over a given length of fiber. Fine tuning of leakage losses can be performed by adjusting the hole dimension and/or the hole spacing to yield a desired operation with a desired leakage loss of the fundamental mode. Resulting holely fibers have a large hole dimension and spacing, and thus a large core, when compared to traditional fibers and conventional fibers that propagate a single mode. Other loss mechanisms, such as bend loss and modal spacing can be utilized for selected modes of operation of holey fibers. Other embodiments are also provided.

    摘要翻译： 各种有孔光纤提供光学传播。 在各种实施例中，例如，大的核心多孔纤维包括由几个布置成几层的大孔形成的包层区域。 可以使用围绕大芯的多个层或多排的孔来粗调基本信号和较高模式的信号的泄漏损耗，从而通过在给定长度的光纤上的泄漏来基本上消除非基本模式 。 泄漏损失的微调可以通过调整孔尺寸和/或孔间距来实现，以产生所需的基本模式的泄漏损失的操作。 与传统单模式的传统纤维和传统纤维相比，所产生的多孔纤维具有较大的孔尺寸和间距，因而具有较大的纤芯。 诸如弯曲损耗和模态间隔的其它损耗机制可以用于多孔纤维的选定操作模式。 还提供了其他实施例。

    Quasi-phase-matched parametric chirped pulse amplification systems
    6.
    发明授权
    Quasi-phase-matched parametric chirped pulse amplification systems 失效
    准相位匹配参数啁啾脉冲放大系统

    公开(公告)号：US06208458B1

    公开(公告)日：2001-03-27

    申请号：US09116241

    申请日：1998-07-16

    申请人： Almantas Galvanauskas ,  Donald Harter ,  Gregg Sucha

    发明人： Almantas Galvanauskas ,  Donald Harter ,  Gregg Sucha

    IPC分类号： H01S310

    CPC分类号： G02F1/39 ,  A61B18/22 ,  A61C1/0046 ,  B23K26/0624 ,  B23K26/40 ,  B23K2101/40 ,  B23K2103/50 ,  G02F2001/3548 ,  G02F2001/392 ,  H01S3/0057 ,  H01S3/0604 ,  H01S3/115

    摘要： Use of quasi-phase-matched (QPM) materials for parametric chirped pulse amplification (PCPA) substantially reduces the required pump peak power and pump brightness, allowing exploitation of spatially-multimode and long duration pump pulses. It also removes restrictions on pump wavelength and amplification bandwidth. This allows substantial simplification in pump laser design for a high-energy PCPA system and, consequently, the construction of compact diode-pumped sources of high-energy ultrashort optical pulses. Also, this allows elimination of gain-narrowing and phase-distortion limitations on minimum pulse duration, which typically arise in a chirped pulse amplification system. One example of a compact source of high-energy ultrashort pulses is a multimode-core fiber based PCPA system. Limitations on pulse energy due to the limited core size for single-mode fibers are circumvented by using large multimode core. Limitations on pulse duration and beam quality due to multimode core are circumvented by using a PCPA scheme. Additionally, the large core of the multimode fiber facilitates cladding-pumping by inexpensive and high-power multiple-mode laser diodes.

    摘要翻译： 使用准相位匹配（QPM）材料进行参数啁啾脉冲放大（PCPA）大大降低了所需的泵浦峰值功率和泵浦亮度，从而允许利用空间多模和长持续时间的泵浦脉冲。 它还消除了对泵浦波长和放大带宽的限制。 这大大简化了用于高能量PCPA系统的泵浦激光器设计，并因此实现了高能量超短脉冲光源的紧凑型二极管泵浦源的构建。 此外，这允许消除通常在啁啾脉冲放大系统中出现的最小脉冲持续时间上的增益变窄和相位失真的限制。 紧凑型高能超短脉冲源的一个例子是基于多模核心光纤的PCPA系统。 通过使用大型多模核，可以避免由于单模光纤尺寸有限引起的脉冲能量限制。 通过使用PCPA方案可以避免由多模核引起的脉冲持续时间和光束质量的限制。 此外，多模光纤的大芯片有助于通过廉价和大功率多模激光二极管进行包层泵浦。

    Quasi-phase-matched parametric chirped pulse amplification systems
    7.
    再颁专利
    Quasi-phase-matched parametric chirped pulse amplification systems 有权
    准相位匹配参数啁啾脉冲放大系统

    公开(公告)号：USRE45177E1

    公开(公告)日：2014-10-07

    申请号：US10396815

    申请日：2003-03-26

    申请人： Almantas Galvanauskas ,  Donald Harter ,  Gregg Sucha

    发明人： Almantas Galvanauskas ,  Donald Harter ,  Gregg Sucha

    IPC分类号： H01S3/10 ,  H01S3/091

    CPC分类号： G02F1/39 ,  A61B18/22 ,  A61C1/0046 ,  B23K26/0624 ,  G02F2001/3548 ,  G02F2001/392 ,  H01S3/0057 ,  H01S3/0604 ,  H01S3/115

    摘要： Use of quasi-phase-matched (QPM) materials for parametric chirped pulse amplification (PCPA) substantially reduces the required pump peak power and pump brightness, allowing exploitation of spatially-multimode and long duration pump pulses. It also removes restrictions on pump wavelength and amplification bandwidth. This allows substantial simplification in pump laser design for a high-energy PCPA system and, consequently, the construction of compact diode-pumped sources of high-energy ultrashort optical pulses. Also, this allows elimination of gain-narrowing and phase-distortion limitations on minimum pulse duration, which typically arise in a chirped pulse amplification system. One example of a compact source of high-energy ultrashort pulses is a multimode-core fiber based PCPA system. Limitations on pulse energy due to the limited core size for single-mode fibers are circumvented by using large multimode core. Limitations on pulse duration and beam quality due to multimode core are circumvented by using a PCPA scheme. Additionally, the large core of the multimode fiber facilitates cladding-pumping by inexpensive and high-power multiple-mode laser diodes.

    摘要翻译： 使用准相位匹配（QPM）材料进行参数啁啾脉冲放大（PCPA），大大降低了所需的泵浦峰值功率和泵浦亮度，从而允许利用空间多模和长时间泵浦脉冲。 它还消除了对泵浦波长和放大带宽的限制。 这大大简化了用于高能量PCPA系统的泵浦激光器设计，并因此实现了高能量超短脉冲光源的紧凑型二极管泵浦源的构建。 此外，这允许消除通常在啁啾脉冲放大系统中出现的最小脉冲持续时间上的增益变窄和相位失真的限制。 紧凑型高能超短脉冲源的一个例子是基于多模核心光纤的PCPA系统。 通过使用大型多模核，可以避免由于单模光纤尺寸有限引起的脉冲能量限制。 通过使用PCPA方案可以避免由多模核引起的脉冲持续时间和光束质量的限制。 此外，多模光纤的大芯片有助于通过廉价和大功率多模激光二极管进行包层泵浦。

    High power fiber chirped pulse amplification system utilizing telecom-type components
    8.
    发明授权
    High power fiber chirped pulse amplification system utilizing telecom-type components 有权
    大功率光纤啁啾脉冲放大系统利用电信型元件

    公开(公告)号：US07907334B2

    公开(公告)日：2011-03-15

    申请号：US12502255

    申请日：2009-07-14

    申请人： Xinhua Gu ,  Yuzuru Uehara ,  Donald Harter

    发明人： Xinhua Gu ,  Yuzuru Uehara ,  Donald Harter

    IPC分类号： H04B10/17 ,  H01S3/098 ,  H01S3/10

    CPC分类号： H01S3/2333 ,  H01S3/0057 ,  H01S3/0085 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/0941 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2316

    摘要： A chirped pulse amplifier (CPA) system having a mode-locked laser and a high-speed pulse selector, wherein the pulse selector modulates output pulses based upon an applied modulation voltage. A pulse selector may be an integrated electro-optic modulator, for example a LiNbO3 modulator, or an electro-absorption modulator. Difficulties related to free-space alignment and operational stability of some prior designs are reduced or eliminated. Fiber coupling generally simplifies beam delivery and alignment. Some embodiments include an erbium fiber (or erbium-ytterbium) based CPA system operating at a wavelength of approximately 1550 nanometers. Similar performance can be obtained at other wavelengths, for example a 1.06 micrometer Yb-doped fiber system. Moreover, high amplification and peak intensity at the output may be achieved while avoiding non-linear effects in the pulse selector, thereby providing for high intensity picosecond or femtosecond operation.

    摘要翻译： 具有锁模激光器和高速脉冲选择器的啁啾脉冲放大器（CPA）系统，其中所述脉冲选择器基于所施加的调制电压来调制输出脉冲。 脉冲选择器可以是集成电光调制器，例如LiNbO 3调制器或电吸收调制器。 减少或消除了一些现有设计中与自由空间对准和操作稳定性相关的困难。 光纤耦合通常简化光束传输和对准。 一些实施例包括以约1550纳米的波长工作的基于铒光纤（或铒 - 镱）的CPA系统。 在其他波长下可以获得类似的性能，例如1.06微米的Yb掺杂光纤系统。 此外，可以在避免脉冲选择器中的非线性效应的同时实现输出端的高放大和峰值强度，从而提供高强度皮秒或飞秒操作。

    Modular, high energy, widely-tunable ultrafast fiber source
    9.
    发明申请
    Modular, high energy, widely-tunable ultrafast fiber source 有权

    公开(公告)号：US20070103765A1

    公开(公告)日：2007-05-10

    申请号：US11643765

    申请日：2006-12-22

    申请人： Martin Fermann ,  Almantas Galvanauskas ,  Donald Harter

    发明人： Martin Fermann ,  Almantas Galvanauskas ,  Donald Harter

    IPC分类号： H01S3/00

    CPC分类号： H01S3/1115 ,  H01S3/0057 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094019 ,  H01S3/094042 ,  H01S3/109 ,  H01S3/1112 ,  H01S3/1616 ,  H01S3/1618 ,  H01S3/302

    摘要： A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. 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 optimized 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. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth 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, or an Anti-Stokes fiber in conjunction with fiber amplifiers and Raman-shifters are used. A particularly compact implementation of the whole system uses fiber oscillators in conjunction with fiber amplifiers. Additionally, long, distributed, positive dispersion optical amplifiers are used to improve transmission characteristics of an optical communication system. Finally, an optical communication system utilizes a Raman amplifier fiber pumped by a train of Raman-shifted, wavelength-tunable pump pulses, to thereby amplify an optical signal which counterpropogates within the Raman amplifier fiber with respect to the pump pulses.