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    • 12. 发明授权
      US07280730B2 Large core holey fibers 有权
    • Large core holey fibers
    • 大核心多孔纤维
    • US07280730B2
    • 2007-10-09
    • US10844943
    • 2004-05-13
    • Liang Dong , Donald J. Harter , William Wong
    • Liang Dong , Donald J. Harter , William Wong
    • G02B6/02 , G02B6/26
    • 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
    • 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 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. Other embodiments are also provided.
    • 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。 还提供了其他实施例。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 13. 发明授权
      US07167300B2 Modular, high energy, widely-tunable ultrafast fiber source 有权
    • Modular, high energy, widely-tunable ultrafast fiber source
    • US07167300B2
    • 2007-01-23
    • US11074765
    • 2005-03-09
    • Martin E. Fermann , Almantas Galvanauskas , Donald J. Harter
    • Martin E. Fermann , Almantas Galvanauskas , Donald J. Harter
    • H01S3/08
    • H01S3/1115 , H01S3/0057 , H01S3/0675 , H01S3/06754 , H01S3/094019 , H01S3/094042 , H01S3/109 , H01S3/1112 , H01S3/1616 , H01S3/1618 , H01S3/302
    • 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.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 17. 发明授权
      US06744555B2 Ultrashort-pulse source with controllable wavelength output 失效
    • Ultrashort-pulse source with controllable wavelength output
    • 具有可控波长输出的超短脉冲源
    • US06744555B2
    • 2004-06-01
    • US09042666
    • 1998-03-17
    • Almantas Galvanauskas , Mark A. Arbore , Martin M. Fejer , Donald J. Harter
    • Almantas Galvanauskas , Mark A. Arbore , Martin M. Fejer , Donald J. Harter
    • G02F1365
    • G02F1/3132 , G01B9/02007 , G01B9/02014 , G01B9/02091 , G02F1/3137 , G02F1/335 , G02F1/3532 , G02F1/395 , G02F2001/3548 , G02F2201/124 , G02F2203/26
    • A multiple-wavelength ultrashort-pulse laser system includes a laser generator producing ultrashort pulses at a fixed wavelength, and at least one and preferably a plurality of wavelength-conversion channels. Preferably, a fiber laser system is used for generating single-wavelength, ultrashort pulses. An optical split switch matrix directs the pulses from the laser generator into at least one of the wavelength conversion channels. An optical combining switch matrix is disposed downstream of the wavelength-conversion channels and combines outputs from separate wavelength-conversion channels into a single output channel. Preferably, waveguides formed in a ferroelectric substrate by titanium indiffusion (TI) and/or proton exchange (PE) form the wavelength-conversion channels and the splitting and combining matrices. Use of the waveguide allows efficient optical parametric generation to occur in the wavelength-conversion channels at pulse energies achievable with a mode-locked laser source. The multiple-wavelength laser system can replace a plurality of different, single-wavelength laser systems. In its simplest form, the system can be used to convert the laser wavelength to a more favorable wavelength. For example, pulses generated at 1.55 &mgr;m by a mode-locked erbium fiber laser can be converted to 1.3 &mgr;m for use in optical coherence tomography or to wavelengths suitable for use in a display, printing or machining system.
    • 多波长超短脉冲激光系统包括产生固定波长的超短脉冲的激光发生器和至少一个，优选多个波长转换通道。 优选地，光纤激光系统用于产生单波长超短脉冲。 光分路开关矩阵将来自激光发生器的脉冲引导到至少一个波长转换通道。 光学组合开关矩阵设置在波长转换通道的下游，并将来自分离的波长转换通道的输出组合成单个输出通道。 优选地，通过钛扩散（TI）和/或质子交换（PE）在铁电衬底中形成的波导形成波长转换通道和分离和组合矩阵。 波导的使用允许在波长转换通道中以在锁模激光源可实现的脉冲能量下发生有效的光参量产生。 多波长激光系统可以代替多个不同的单波长激光系统。 在其最简单的形式中，该系统可用于将激光波长转换成更有利的波长。 例如，通过模式锁定铒光纤激光器在1.55μm生成的脉冲可以转换为1.3μm，用于光学相干断层摄影或适用于显示，印刷或加工系统的波长。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 19. 发明授权
      US6072811A Integrated passively modelocked fiber lasers and method for constructing the same 失效
    • Integrated passively modelocked fiber lasers and method for constructing the same
    • 集成无源锁模光纤激光器及其构造方法
    • US6072811A
    • 2000-06-06
    • US21863
    • 1998-02-11
    • Martin E. Fermann , Donald J. Harter
    • Martin E. Fermann , Donald J. Harter
    • H01S3/06 , H01S3/067 , H01S3/098 , H01S3/10 , H01S3/113 , G02B6/34
    • H01S3/1118 , H01S3/067
    • 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 is obtained by employing a saturable absorber coupled to one end of a highly-birefringent fiber serving as the laser cavity. 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.
    • 通过使用耦合到高双折射光纤的一端的可饱和吸收器，通常不使用任何非光纤腔内偏振操作元件来产生短光脉冲的超紧凑锁模光纤激光器的稳定操作， 激光腔。 一旦将激光器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，并且防止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。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
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