公开(公告)号：US09680280B2

公开(公告)日：2017-06-13

申请号：US13967465

申请日：2013-08-15

Applicant: IMRA AMERICA, INC.

Inventor： Salvatore F. Nati ,  Otho E. Ulrich, Jr. ,  Gyu C. Cho ,  Wayne A. Gillis ,  Donald J. Harter ,  Mark Bendett ,  Ingmar Hartl

IPC: H01S3/00 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/11 ,  H01S3/10 ,  H01S3/105 ,  H01S3/13 ,  H01S3/131 ,  H01S3/139

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

Abstract: 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.

公开(公告)号：US09590386B2

公开(公告)日：2017-03-07

申请号：US14482093

申请日：2014-09-10

Applicant: IMRA AMERICA, INC.

Inventor： Donald J. Harter ,  Gyu C. Cho ,  Zhenlin Liu ,  Martin E. Fermann ,  Xinhua Gu ,  Salvatore F. Nati ,  Lawrence Shah ,  Ingmar Hartl ,  Mark Bendett

IPC: H01S3/11 ,  H01S3/23 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/108 ,  H01S3/109 ,  H01S3/16

CPC classification number: H01S3/1106 ,  H01S3/005 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/0085 ,  H01S3/0092 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094003 ,  H01S3/094019 ,  H01S3/094042 ,  H01S3/094076 ,  H01S3/09415 ,  H01S3/1086 ,  H01S3/109 ,  H01S3/11 ,  H01S3/1118 ,  H01S3/1305 ,  H01S3/1611 ,  H01S3/1618 ,  H01S3/1643 ,  H01S3/235

Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.

Abstract translation: 本发明描述了可用作用于工业设置的用于基于Nd：或Yb：的再生放大器的脉冲源的鲁棒光纤激光器系统。 本发明修改了适应性，并结合了FCPA系统中的几个最新进展，用作这种新型再生放大器的输入源。

公开(公告)号：US20160164247A1

公开(公告)日：2016-06-09

申请号：US14223287

申请日：2014-03-24

Applicant: IMRA America, Inc.

Inventor： Martin E. Fermann ,  Donald J. Harter

IPC: H01S3/11 ,  H01S3/094 ,  H01S3/067

CPC classification number: 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

Abstract: 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.

Abstract translation: 激光器利用空腔设计，允许从锁模多模光纤激光器稳定地产生高峰值功率脉冲，大大延长了常规锁模单模光纤激光器的峰值功率极限。 可以通过将可饱和吸收体插入空腔中并通过插入一个或多个模式滤波器来确保多模光纤中的基模的振荡来引起锁模。 可以通过将额外的半导体光功率限制器插入空腔中来最小化吸收器的损坏概率。

公开(公告)号：US09147989B2

公开(公告)日：2015-09-29

申请号：US14100912

申请日：2013-12-09

Applicant: IMRA AMERICA, INC.

Inventor： Lawrence Shah ,  James M. Bovatsek ,  Alan Y. Arai ,  Tadashi Yamamoto ,  Rajesh S. Patel ,  Donald J. Harter

IPC: H01S3/30 ,  H01S3/00 ,  G01J11/00 ,  H01S3/102 ,  H01S3/067 ,  H01S3/109 ,  H01S3/13 ,  H01S3/16

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140192403A1

公开(公告)日：2014-07-10

申请号：US14174269

申请日：2014-02-06

Applicant: IMRA America, Inc.

Inventor： Martin E. Fermann ,  Donald J. Harter

IPC: H01S3/067 ,  G02B6/26

CPC classification number: 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

Abstract: 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.

Abstract translation: 激光器利用空腔设计，允许从锁模多模光纤激光器稳定地产生高峰值功率脉冲，大大延长了常规锁模单模光纤激光器的峰值功率极限。 可以通过将可饱和吸收体插入空腔中并通过插入一个或多个模式滤波器来确保多模光纤中的基模的振荡来引起锁模。 可以通过将额外的半导体光功率限制器插入空腔中来最小化吸收器的损坏概率。

公开(公告)号：US10197727B2

公开(公告)日：2019-02-05

申请号：US15485025

申请日：2017-04-11

Applicant: IMRA America, Inc.

Inventor： Liang Dong ,  Donald J. Harter ,  William Wong

IPC: G02B6/032 ,  H01S3/00 ,  H01S3/067 ,  G02B6/02 ,  G02B6/14 ,  G02B6/024 ,  G02B6/32

Abstract: Holey fibers provide optical propagation. In various embodiments, 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 spacing to yield a desired operation with a desired leakage loss of the fundamental mode. Resulting holey 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.

公开(公告)号：US09042004B2

公开(公告)日：2015-05-26

申请号：US13936278

申请日：2013-07-08

Applicant: IMRA AMERICA, INC.

Inventor： Martin E. Fermann ,  Gennady Imeshev ,  Gyu C. Cho ,  Zhenlin Liu ,  Donald J. Harter

IPC: H01S3/067 ,  H01S3/00 ,  H01S3/13 ,  H01S3/094 ,  H01S3/108 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30

CPC classification number: H01S3/0057 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/06741 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094007 ,  H01S3/1086 ,  H01S3/1301 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2308 ,  H01S3/2316 ,  H01S3/302

Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.

Abstract translation: 通过补偿光子晶体光纤脉冲压缩器中的偏振模色散以及色散，可以从全光纤啁啾脉冲放大系统获得高脉冲能量。 通过自相位调制在光纤放大器中产生三阶色散，可以补偿来自大容量光栅脉冲压缩器的三阶色散，可以提高混合光纤/体积啁啾脉冲放大系统的脉冲质量。 最后，通过在负色散光纤放大器中正向啁啾脉冲放大，可以获得通过反斯托克斯频移的低噪声波长可调种子源。

公开(公告)号：US20150036701A1

公开(公告)日：2015-02-05

申请号：US14500563

申请日：2014-09-29

Applicant: IMRA America, Inc.

Inventor： Liang Dong ,  Donald J. Harter ,  William Wong

IPC: G02B6/032 ,  H01S3/067 ,  G02B6/02 ,  G02B6/024 ,  G02B6/32

CPC classification number: 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

Abstract: Holey fibers provide optical propagation. In various embodiments, 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 spacing to yield a desired operation with a desired leakage loss of the fundamental mode. Resulting holey 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.

Abstract translation: 多孔纤维提供光学传播。 在各种实施例中，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 。 可以通过调节孔尺寸和/或间距来实现漏电损耗的微调，以产生所需的基本模式的泄漏损耗的操作。 与传统单模的传统纤维和常规纤维相比，所产生的多孔纤维具有较大的孔尺寸和间距，因此具有较大的纤芯。 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。