公开(公告)号：US20060093291A1

公开(公告)日：2006-05-04

申请号：US11283701

申请日：2005-11-22

申请人： Liang Dong ,  Donald Harter

发明人： Liang Dong ,  Donald Harter

IPC分类号： G02B6/04

CPC分类号： G02B6/2551 ,  G02B6/2856 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094053 ,  H01S3/09408

摘要： One or more single mode few-moded or multimode fibers are incorporated into a bundle to carry input to a fiber amplifier or output from a fiber amplifier or a fiber laser. The input is at the signal wavelength, which is the wavelength where amplification or lasing occurs. Each of the fibers in the bundle is cleaved individually or as a group and fiber ends are aligned in the same plane. The fiber amplifier or fiber laser may include a double clad fiber and the other fibers of the bundle couple light for cladding pumping. The device may also include a mode filter for controlling the output mode.

摘要翻译： 一个或多个单模多模或多模光纤被并入到束中以将输入传送到光纤放大器或从光纤放大器或光纤激光器输出。 输入信号波长为发生放大或激光的波长。 束中的每个纤维单独地或作为一组裂解，并且纤维末端在同一平面中对准。 光纤放大器或光纤激光器可以包括双包层光纤，并且该束的其它光纤耦合光以进行包层泵浦。 该装置还可以包括用于控制输出模式的模式滤波器。

公开(公告)号：US20050225846A1

公开(公告)日：2005-10-13

申请号：US10813173

申请日：2004-03-31

申请人： Salvatore Nati ,  Otho Ulrich ,  Gyu Cho ,  Wayne Gillis ,  Donald Harter ,  Mark Bendett ,  Ingmar Hartl

发明人： Salvatore Nati ,  Otho Ulrich ,  Gyu Cho ,  Wayne Gillis ,  Donald Harter ,  Mark Bendett ,  Ingmar Hartl

IPC分类号： H01S3/067 ,  H01S3/0941 ,  H01S3/098 ,  H01S3/10 ,  H01S3/105 ,  H01S3/13 ,  H01S3/131 ,  H01S3/23 ,  H04B10/12

CPC分类号： H01S3/06779 ,  H01S3/06758 ,  H01S3/0941 ,  H01S3/10015 ,  H01S3/1003 ,  H01S3/10038 ,  H01S3/10046 ,  H01S3/105 ,  H01S3/1112 ,  H01S3/1305 ,  H01S3/1312 ,  H01S3/1394

摘要： An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy.

摘要翻译： 公开了一种用于控制由脉冲源和大功率光纤放大器组成的激光系统的电子电路。 该电路用于控制高功率光纤放大器系统的增益，使得放大的输出脉冲具有预定的脉冲能量，因为振荡器的脉冲宽度和重复率是变化的。 这包括当脉冲串打开时保持脉冲能量恒定。 该电路还用于控制高功率光纤放大器泵浦二极管的温度，使得当二极管电流变化时，泵浦二极管的波长保持在光纤放大器的最佳吸收波长。 电路还提供了保护大功率光纤放大器免受来自脉冲源的信号损失或由于注入能量不足的脉冲源信号的损害的手段。

公开(公告)号：US20050111500A1

公开(公告)日：2005-05-26

申请号：US10960923

申请日：2004-10-12

申请人： Donald Harter ,  Gyu Cho ,  Martin Fermann ,  Ingmar Hartl

发明人： Donald Harter ,  Gyu Cho ,  Martin Fermann ,  Ingmar Hartl

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

CPC分类号： H01S5/5045 ,  H01S3/005 ,  H01S3/0057 ,  H01S3/0078 ,  H01S3/0085 ,  H01S3/067 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094042 ,  H01S3/10023 ,  H01S3/109 ,  H01S3/1616 ,  H01S3/1618 ,  H01S3/1643 ,  H01S3/235

摘要： An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and/or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.

摘要翻译： 一种优化的Yb：掺杂光纤锁模振荡器和光纤放大器系统，用于种子Nd：或Yb：掺杂再生放大器。 脉冲在Yb或Nd：掺杂光纤锁模振荡器中产生，并可能经历频谱变窄或变宽，波长转换，时间脉冲压缩或拉伸，脉冲衰减和/或降低脉冲序列的重复率。 调节脉冲随后耦合到Yb或Nd：光纤放大器中。 在基于Nd：或Yb：掺杂的固态激光材料的再生放大器中，放大后的放大脉冲被拉伸，然后再压缩输出。

公开(公告)号：US20070273960A1

公开(公告)日：2007-11-29

申请号：US11837463

申请日：2007-08-10

申请人： Martin Fermann ,  Gennady Imeshev ,  Ingmar Hartl ,  Donald Harter

发明人： Martin Fermann ,  Gennady Imeshev ,  Ingmar Hartl ,  Donald Harter

IPC分类号： H01S3/00 ,  H04B10/12

CPC分类号： H01S3/06754 ,  H01S3/005 ,  H01S3/0057 ,  H01S3/0085 ,  H01S3/0092 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/094007 ,  H01S3/10015

摘要： By writing non-linear chirp into fiber Bragg gratings, greater control over dispersion compensation in chirped pulse amplification (CPA) systems is obtained, such that, for example, the dispersion profile of the fiber Bragg grating and a bulk compressor may be matched. An iterative method of writing the fiber grating can reduce the group delay ripple to very low levels; and adaptive control of the fiber grating dispersion profile can further reduce these levels, while in addition offering greater acceptable yield in the manufacture of such gratings. Fiber Bragg gratings may be designed so as to provide customized pulse shapes optimized for various end uses, such as micromachining, for example, and may also be used to counteract gain-narrowing in a downstream amplifier.

摘要翻译： 通过将非线性啁啾写入光纤布拉格光栅，获得对啁啾脉冲放大（CPA）系统中色散补偿的更大控制，使得例如光纤布拉格光栅和大容量压缩机的色散曲线可以匹配。 编写光纤光栅的迭代方法可以将组延迟纹波降低到非常低的水平; 并且光纤光栅色散轮廓的自适应控制可以进一步降低这些水平，同时在制造这种光栅时提供更大的可接受的产量。 可以设计光纤布拉格光栅，以便提供针对各种最终用途（例如微加工）优化的定制脉冲形状，并且还可以用于抵消下游放大器中的增益变窄。

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。

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.

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。

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.

公开(公告)号：US20050000952A1

公开(公告)日：2005-01-06

申请号：US10848746

申请日：2004-05-19

申请人： Donald Harter

发明人： Donald Harter

IPC分类号： B23K26/06 ,  B23K26/36

CPC分类号： B23K26/0624 ,  B23K26/361

摘要： A system for ablating solid material, which comprises of a laser generating ultra short pulses. The pulses are generated in a medium which conducts the ultra short pulses toward the solid material. The ultra short pulses self focus in the medium to a power sufficient to ablate said solid material.

摘要翻译： 一种用于烧蚀固体材料的系统，其包括产生超短脉冲的激光。 脉冲在向固体材料传导超短脉冲的介质中产生。 超短脉冲在介质中自我聚焦成足以消融所述固体材料的功率。

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。