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11. 发明申请

US20060132904A1 Microchip-Yb fiber hybrid optical amplifier for micro-machining and marking 有权
标题翻译：用于微加工和标记的Microchip-Yb光纤混合光放大器
公开(公告)号：US20060132904A1
公开(公告)日：2006-06-22
申请号：US11339679
申请日：2006-01-26
申请人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
发明人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
IPC分类号： H01S3/00
CPC分类号： H01S3/0627 , G02B6/262 , G02F1/3525 , H01S3/0606 , H01S3/0615 , H01S3/06708 , H01S3/06754 , H01S3/094003 , H01S3/094007 , H01S3/094069 , H01S3/09415 , H01S3/115 , H01S3/1611 , H01S3/1618 , H01S3/1673 , H01S3/302
摘要： The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers. Particularly utility is disclosed for applications in the marking, micro-machining and drilling areas.
摘要翻译：本发明描述了用于控制高峰值功率脉冲的多模光纤放大的空间以及光束质量的技术，以及使用这种配置来替代当前二极管泵浦的基于钕的源。通过适当的模式匹配光学和技术，可以通过激发多模光纤中的基模来确保完美的空间光束质量。通过使用具有大包层直径的多模光纤，能够使沿着光纤长度的多模光纤中的空间光束质量损失最小化。近衍射极限相干多模放大器可以方便地进行包层泵浦，从而产生高平均功率。此外，通过实施具有应力产生区域或椭圆形光纤核心的多模光纤，可以保持多模光纤放大器中的偏振状态。这些激光器可用作Nd基激光器，尤其是Nd：YAG激光器的一般替代。公开了用于标记，微加工和钻孔领域的应用。

12. 发明申请

US20050232313A1 Single-polarization high power fiber lasers and amplifiers 有权
公开(公告)号：US20050232313A1
公开(公告)日：2005-10-20
申请号：US11109711
申请日：2005-04-20
申请人： Martin Fermann , Donald Harter
发明人： Martin Fermann , Donald Harter
IPC分类号： G02B6/02 , G02B6/024 , G02B6/036 , G02B6/44 , H01S3/06 , H01S3/067 , H01S3/098 , H01S3/10 , H01S3/30
CPC分类号： H01S3/06708 , H01S3/06712 , H01S3/06729 , H01S3/094019 , H01S3/1118
摘要： A novel polarization maintaining optical fiber, which can be used as a high-power polarization maintaining fiber laser or amplifier, is described. Insensitivity of the polarization state to external fiber bending and temperature changes is accomplished by minimizing polarization mode-coupling via reducing stresses inside the fiber core via increasing the fiber diameter. Alternatively, polarization mode-coupling can be minimized by an optimization of the fiber coating to minimize stresses at the interface between the fiber and the coating. As a result insensitivity to polarization mode-coupling is obtained at greatly reduced values of birefringence compared to small-diameter fibers. The fiber is of significant use in any application where polarization stability is important, and will be useful in telecommunications applications in particular for reducing polarization mode dispersion. An implementation in a parabolic pulse-producing fiber laser is also described as one specific high power example.

13. 发明申请

US20050008044A1 Mode-locked multi-mode fiber laser pulse source 审中-公开
公开(公告)号：US20050008044A1
公开(公告)日：2005-01-13
申请号：US10850509
申请日：2004-05-20
申请人： Martin Fermann , Donald Harter
发明人： Martin Fermann , Donald Harter
IPC分类号： H01S3/06 , H01S3/067 , H01S3/098
CPC分类号： H01S3/06708 , G02B6/26 , H01S3/0092 , H01S3/067 , H01S3/06704 , H01S3/06712 , H01S3/06716 , H01S3/06725 , H01S3/06729 , H01S3/06733 , H01S3/06737 , H01S3/06745 , H01S3/06783 , H01S3/08045 , H01S3/08054 , H01S3/094007 , H01S3/094019 , H01S3/094042 , H01S3/094069 , H01S3/1106 , H01S3/1109 , H01S3/1115 , H01S3/1118 , H01S3/1608 , H01S3/1618
摘要： A laser utilizes a cavity design which allows the stable generation of high peak power pulses from mode-locked multi-mode fiber lasers, greatly extending the peak power limits of conventional mode-locked single-mode fiber lasers. Mode-locking may be induced by insertion of a saturable absorber into the cavity and by inserting one or more mode-filters to ensure the oscillation of the fundamental mode in the multi-mode fiber. The probability of damage of the absorber may be minimized by the insertion of an additional semiconductor optical power limiter into the cavity. To amplify and compress optical pulses in a multi-mode (MM) optical fiber, a single-mode is launched into the MM fiber by matching the modal profile of the fundamental mode of the MM fiber with a diffraction-limited optical mode at the launch end, The fundamental mode is preserved in the MM fiber by minimizing mode-coupling by using relatively short lengths of step-index MM fibers with a few hundred modes and by minimizing fiber perturbations. Doping is confined to the center of the fiber core to preferentially amplify the fundamental mode, to reduce amplified spontaneous emission and to allow gain-guiding of the fundamental mode. Gain-guiding allows for the design of systems with length-dependent and power-dependent diameters of the fundamental mode. To allow pumping with high-power laser diodes, a double-clad amplifier structure is employed. For applications in nonlinear pulse-compression, self phase modulation and dispersion in the optical fibers can be exploited. High-power optical pulses may be linearly compressed using bulk optics dispersive delay lines or by chirped fiber Bragg gratings written directly into the SM or MM optical fiber. High-power cw lasers operating in a single near-diffraction-limited mode may be constructed from MM fibers by incorporating effective mode-filters into the laser cavity. Regenerative fiber amplifiers may be constructed from MM fibers by careful control of the recirculating mode. Higher-power Q-switched fiber lasers may be constructed by exploiting the large energy stored in MM fiber amplifiers.

14. 发明申请

US20070109629A1 Microchip - Yb fiber hybrid optical amplifier for micro-machining and marking 有权
标题翻译： Microchip - Yb光纤混合光放大器用于微加工和标记
公开(公告)号：US20070109629A1
公开(公告)日：2007-05-17
申请号：US11643760
申请日：2006-12-22
申请人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
发明人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
IPC分类号： H01S3/00
CPC分类号： H01S3/0627 , G02B6/262 , G02F1/3525 , H01S3/0606 , H01S3/0615 , H01S3/06708 , H01S3/06754 , H01S3/094003 , H01S3/094007 , H01S3/094069 , H01S3/09415 , H01S3/115 , H01S3/1611 , H01S3/1618 , H01S3/1673 , H01S3/302
摘要： The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers. Particularly utility is disclosed for applications in the marking, micro-machining and drilling areas.
摘要翻译：本发明描述了用于控制高峰值功率脉冲的多模光纤放大的空间以及光束质量的技术，以及使用这种配置来替代当前二极管泵浦的基于钕的源。通过适当的模式匹配光学和技术，可以通过激发多模光纤中的基模来确保完美的空间光束质量。通过使用具有大包层直径的多模光纤，能够使沿着光纤长度的多模光纤中的空间光束质量损失最小化。近衍射极限相干多模放大器可以方便地进行包层泵浦，从而产生高平均功率。此外，通过实施具有应力产生区域或椭圆形光纤核心的多模光纤，可以保持多模光纤放大器中的偏振状态。这些激光器可用作Nd基激光器，尤其是Nd：YAG激光器的一般替代。公开了用于标记，微加工和钻孔领域的应用。

15. 发明申请

US20050286569A1 Resonant fabry-perot semiconductor saturable absorbers and two photon absorption power limiters 有权
标题翻译：共振半透半导体饱和吸收器和两个光子吸收功率限制器
公开(公告)号：US20050286569A1
公开(公告)日：2005-12-29
申请号：US11197852
申请日：2005-08-05
申请人： Min Jiang , Donald Harter , Gregg Sucha , Martin Fermann
发明人： Min Jiang , Donald Harter , Gregg Sucha , Martin Fermann
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/08 , H01S3/094 , H01S3/098 , H01S3/106 , H01S3/11 , H01S3/16
CPC分类号： H01S3/1118 , G02F1/3523 , H01S3/067 , H01S3/08059 , H01S3/094003 , H01S3/1063 , H01S3/1608
摘要： An intracavity resonant Fabry-Perot saturable absorber (R-FPSA) induces modelocking in a laser such as a fiber laser. An optical limiter such as a two photon absorber (TPA) can be used in conjunction with the R-FPSA, so that Q-switching is inhibited, resulting in laser output that is cw modelocked. By using both an R-FPSA and a TPA, the Q-switched modelocked behavior of a fiber laser is observed to evolve into cw modelocking.
摘要翻译：腔内共振法布里 - 珀罗可饱和吸收体（R-FPSA）在诸如光纤激光器的激光器中诱导锁模。诸如双光子吸收器（TPA）的光限制器可以与R-FPSA一起使用，使得Q开关被禁止，导致cw锁模的激光输出。通过使用R-FPSA和TPA，观察到光纤激光器的Q开关模式锁定行为演变成cw锁模。

16. 发明申请

US20050185260A1 Microchip - Yb fiber hybrid optical amplifier for micro-machining and marking 审中-公开
公开(公告)号：US20050185260A1
公开(公告)日：2005-08-25
申请号：US10958593
申请日：2004-10-06
申请人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
发明人： Almantas Galvanauskas , Donald Harter , Martin Fermann , Ferenc Raksi
IPC分类号： B23K26/36 , B23K26/40 , G02F1/35 , G02F1/39 , H01S3/00 , H01S3/06 , H01S3/115
CPC分类号： G02F1/39 , B23K26/0622 , B23K26/0624 , G02F2001/3548 , G02F2001/392 , H01S3/0057 , H01S3/0604 , H01S3/06704 , H01S3/06725 , H01S3/06741 , H01S3/06758 , H01S3/08045 , H01S3/094007 , H01S3/115 , H01S3/2325 , H01S2301/03
摘要： The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers. Particularly utility is disclosed for applications in the marking, micro-machining and drilling areas.

17. 发明授权

US07567376B2 High power fiber chirped pulse amplification system utilizing telecom-type components 失效
标题翻译：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。

18. 发明申请

US20050226287A1 Femtosecond laser processing system with process parameters, controls and feedback 有权
标题翻译：飞秒激光加工系统具有工艺参数，控制和反馈
公开(公告)号：US20050226287A1
公开(公告)日：2005-10-13
申请号：US10813269
申请日：2004-03-31
申请人： Lawrence Shah , James Bovatsek , Alan Arai , Tadashi Yamamoto , Rajesh Patel , Donald Harter
发明人： Lawrence Shah , James Bovatsek , Alan Arai , Tadashi Yamamoto , Rajesh Patel , Donald Harter
IPC分类号： G01J11/00 , H01S3/00 , H01S3/067 , H01S3/10 , H01S3/102 , H01S3/109 , H01S3/13 , H01S3/16 , H01S3/23
CPC分类号： H01S3/10038 , G01J11/00 , H01S3/0014 , H01S3/005 , H01S3/0057 , H01S3/0064 , H01S3/0078 , H01S3/06754 , H01S3/10023 , H01S3/10061 , H01S3/102 , H01S3/1024 , H01S3/108 , H01S3/109 , H01S3/1305 , H01S3/1618
摘要： A femtosecond laser based laser processing system having a femtosecond laser, frequency conversion optics, beam manipulation optics, target motion control, processing chamber, diagnostic systems and system control modules. The femtosecond laser based laser processing system allows for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.
摘要翻译：飞秒激光激光处理系统，具有飞秒激光，变频光学，光束操纵光学，目标运动控制，处理室，诊断系统和系统控制模块。基于飞秒激光的激光加工系统允许在微加工中利用独特的热控制，并且该系统具有更大的输出光束稳定性，连续可变的重复率和独特的时间波束整形能力。

19. 发明申请

US20050157998A1 Large core holey fibers 有权
标题翻译：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。

20. 发明授权

US06208458B1 Quasi-phase-matched parametric chirped pulse amplification systems 失效
标题翻译：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。

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