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11 条记录 (耗时 0.012 秒)

    Thermophoretic fractionalization of small particles
    2.
    发明申请
    Thermophoretic fractionalization of small particles 审中-公开
    小颗粒热分解

    公开(公告)号：US20090090614A1

    公开(公告)日：2009-04-09

    申请号：US11973568

    申请日：2007-10-09

    申请人： David J. DiGiovanni ,  Jeffrey Nicholson

    发明人： David J. DiGiovanni ,  Jeffrey Nicholson

    IPC分类号： C07B63/00

    CPC分类号： B82Y40/00 ,  B82Y30/00 ,  C01B32/168

    摘要： Described is a method for fractionalizing nanoparticles according to the conductivity of the particle, thus enabling the production of large numbers of particles with uniform conductivity. The method is based on a modified thermophoresis process wherein a temperature gradient is produced in a mixture of particles and the most conductive particles are selectively deposited on a warm surface. In contrast to conventional thermophoresis methods, the temperature gradient that drives the fractionalization process is produced using a light source.

    摘要翻译： 描述了根据颗粒的电导率分级纳米颗粒的方法，从而能够生产具有均匀导电性的大量颗粒。 该方法基于改进的热泳方法，其中在颗粒混合物中产生温度梯度，并且最热传导的颗粒被选择性地沉积在温暖的表面上。 与传统的热泳方法相比，使用光源产生驱动分级过程的温度梯度。

    High power amplifiers
    3.
    发明申请
    High power amplifiers 审中-公开
    大功率放大器

    公开(公告)号：US20070201880A1

    公开(公告)日：2007-08-30

    申请号：US11362973

    申请日：2006-02-27

    申请人： Jeffrey Nicholson

    发明人： Jeffrey Nicholson

    IPC分类号： H04B10/04 ,  H04B10/12

    CPC分类号： H01S3/0057 ,  G02F1/0327 ,  H01S3/0085 ,  H01S3/2308

    摘要： The specification describes an improved seed laser source for high power MOPA applications. Improvement is obtained by modulating the seed laser with a broadband noise function, for example, a Guassian noise function. A broadband noise function is one in which, in contrast to a sine wave function for example, has an RF spectrum with a bandwidth comparable in value to the mean frequency. Use of a broadband noise modulator allows effective tuning of the output of the modulated laser.

    摘要翻译： 该规范描述了用于大功率MOPA应用的改进的种子激光源。 通过用宽带噪声函数（例如，Guassian噪声函数）调制种子激光器来获得改进。 宽带噪声功能是与例如正弦波函数相反的宽带噪声功能具有带宽与平均频率相当的带宽的RF频谱。 使用宽带噪声调制器可以有效调谐调制激光器的输出。

    Stabilized optical fiber continuum frequency combs using post-processed highly nonlinear fibers
    4.
    发明申请
    Stabilized optical fiber continuum frequency combs using post-processed highly nonlinear fibers 有权
    使用后处理高度非线性光纤的稳定光纤连续谱梳

    公开(公告)号：US20060251424A1

    公开(公告)日：2006-11-09

    申请号：US11417093

    申请日：2006-05-03

    申请人： Jeffrey Nicholson ,  Paul Westbrook

    发明人： Jeffrey Nicholson ,  Paul Westbrook

    IPC分类号： H04B10/12

    CPC分类号： G02F1/365 ,  G02F2/002 ,  G02F2201/02 ,  G02F2201/307 ,  G02F2203/56

    摘要： An arrangement for generating beat notes with a relatively high signal-to-noise ratio (SNR) utilizes a pulsed laser source coupled into a section of post-processed highly-nonlinear optical fiber (HNLF) to generate a frequency comb having one or more regions of enhanced spectral power. A second laser signal source is overlapped with the frequency comb to form one or more “beat notes” at difference frequencies(y) between the second source and the continuum comb. By virtue of the post-processing, areas of spectral enhancement are formed along the comb, and are positioned to interact with the second laser signal to generate optical beat notes. The second laser signal may be from an external source (forming beat notes from a signal “outside” of the comb), or may be a frequency-multiplied version of the generated supercontinuum (forming beat notes from a signal “within” the comb).

    摘要翻译： 用于产生具有相对高的信噪比（SNR）的节拍的装置利用耦合到后处理的高非线性光纤（HNLF）的一部分中的脉冲激光源来产生具有一个或多个区域 的增强光谱功率。 第二激光信号源与频率梳重叠，以在第二源和连续梳之间的差频（y）处形成一个或多个“拍音”。 通过后处理，沿着梳状物形成光谱增强的区域，并且被定位成与第二激光信号相互作用以产生光学拍音。 第二激光信号可以来自外部源（从梳状物的“外部”的信号形成节拍音符），或者可以是所生成的超连续谱的倍频版本（从“梳”内的信号形成节奏音符） 。

    Fiber amplifier for generating femtosecond pulses in single mode fiber
    5.
    发明授权
    Fiber amplifier for generating femtosecond pulses in single mode fiber 有权
    用于在单模光纤中产生飞秒脉冲的光纤放大器

    公开(公告)号：US06990270B2

    公开(公告)日：2006-01-24

    申请号：US10776432

    申请日：2004-02-11

    申请人： Jeffrey Nicholson

    发明人： Jeffrey Nicholson

    IPC分类号： G02B6/00 ,  G02B6/26

    CPC分类号： H01S3/06754 ,  H01S3/0057 ,  H01S3/094011 ,  H01S2301/08

    摘要： A source of high-power femtosecond optical pulses comprises a combination of a relatively short rare-earth doped fiber amplifier (e.g., less than five meters) with a first section of single mode fiber (or other dispersive element) disposed at the input of the amplifier to “pre-chirp” the output from a femtosecond pulse source, and a second section of single mode fiber fused to the output of the fiber amplifier to provide compression to the amplified pulses generated by the fiber amplifier. The rare-earth doped fiber amplifier is formed to comprise a normal dispersion, which when combined with self-phase modulation and distributed gain leads to a regime in amplifiers defined as “self-similar propagation”. In this regime of operation, the fiber amplifier generates high energy pulses with a parabolic shape (the parabolic shape defined as a function of time). These pulses also exhibit a strong linear chirp, where the linear nature of the chirp leads to efficient compression of the pulses.

    摘要翻译： 大功率飞秒光脉冲的源包括相对较短的稀土掺杂光纤放大器（例如，小于5米）与设置在输入端的单模光纤（或其它色散元件）的第一部分的组合 放大器将来自飞秒脉冲源的输出进行“预先啁啾”，以及与光纤放大器的输出端融合的单模光纤的第二部分，以对由光纤放大器产生的放大脉冲提供压缩。 稀土掺杂光纤放大器被形成为包括正常色散，其在与自相位调制和分布增益相结合时导致定义为“自相似传播”的放大器的状态。 在这种操作状态下，光纤放大器产生具有抛物面形状的高能量脉冲（抛物线形状定义为时间的函数）。 这些脉冲还表现出强烈的线性啁啾，其中线性调频脉冲的线性特性导致脉冲的有效压缩。

    Enhanced supercontinuum generation in highly nonlinear fibers using post-fabrication processing
    7.
    发明申请
    Enhanced supercontinuum generation in highly nonlinear fibers using post-fabrication processing 有权
    使用后制造加工在高度非线性光纤中增强超连续谱生成

    公开(公告)号：US20050226576A1

    公开(公告)日：2005-10-13

    申请号：US11063406

    申请日：2005-02-22

    申请人： Kenneth Feder ,  Jeffrey Nicholson ,  Paul Westbrook

    发明人： Kenneth Feder ,  Jeffrey Nicholson ,  Paul Westbrook

    IPC分类号： G02F1/35 ,  G02B6/00 ,  G02B6/02 ,  G02B6/34 ,  G02F1/365

    CPC分类号： G02B6/02028 ,  G02B6/021 ,  G02B6/02242 ,  G02F1/365

    摘要： Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by performing at least one post-processing treatment on the HNLF. Particularly, UV exposure of the HNLF will modify its dispersion and effective area characteristics so as to increase its supercontinuum bandwidth, without resorting to techniques such as tapering or introducing unwanted reflections into the HNLF. The UV exposure can be uniform, slowly varying or aperiodic along the length of the HNLF, where the radiation will modify the nonlinear properties of the HNLF. Various other methods of altering these properties may be used. The output from the HNLF can be monitored and used to control the post-processing operation in order to achieve a set of desired features in the enhanced supercontinuum spectrum.

    摘要翻译： 通过对HNLF进行至少一次后处理处理来实现高非线性光纤（HNLF）的超连续谱生成性能的提高。 特别地，HNLF的紫外线曝光将改变其色散和有效面积特性，以便增加其超连续谱带宽，而不需要采用诸如锥形化或将不想要的反射引入到HNLF中的技术。 紫外线暴露可以沿着HNLF的长度均匀，缓慢变化或非周期性，其中辐射将改变HNLF的非线性特性。 可以使用改变这些性质的各种其它方法。 HNLF的输出可以被监视并用于控制后处理操作，以便在增强的超连续谱中获得一组所需的特征。

    Fiber amplifier for generating femtosecond pulses in single mode fiber
    8.
    发明申请
    Fiber amplifier for generating femtosecond pulses in single mode fiber 有权
    用于在单模光纤中产生飞秒脉冲的光纤放大器

    公开(公告)号：US20050175280A1

    公开(公告)日：2005-08-11

    申请号：US10776432

    申请日：2004-02-11

    申请人： Jeffrey Nicholson

    发明人： Jeffrey Nicholson

    IPC分类号： H01S3/10 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  G02B6/26

    CPC分类号： H01S3/06754 ,  H01S3/0057 ,  H01S3/094011 ,  H01S2301/08

    摘要： A source of high-power femtosecond optical pulses comprises a combination of a relatively short rare-earth doped fiber amplifier (e.g., less than five meters) with a first section of single mode fiber (or other dispersive element) disposed at the input of the amplifier to “pre-chirp” the output from a femtosecond pulse source, and a second section of single mode fiber fused to the output of the fiber amplifier to provide compression to the amplified pulses generated by the fiber amplifier. The rare-earth doped fiber amplifier is formed to comprise a normal dispersion, which when combined with self-phase modulation and distributed gain leads to a regime in amplifiers defined as “self-similar propagation”. In this regime of operation, the fiber amplifier generates high energy pulses with a parabolic shape (the parabolic shape defined as a function of time). These pulses also exhibit a strong linear chirp, where the linear nature of the chirp leads to efficient compression of the pulses.

    摘要翻译： 高功率飞秒光脉冲的源包括相对较短的稀土掺杂光纤放大器（例如，小于5米）与设置在输入端的单模光纤（或其它色散元件）的第一部分的组合 放大器将来自飞秒脉冲源的输出进行“预先啁啾”，以及与光纤放大器的输出端融合的单模光纤的第二部分，以对由光纤放大器产生的放大脉冲提供压缩。 稀土掺杂光纤放大器被形成为包括正常色散，其在与自相位调制和分布增益相结合时导致定义为“自相似传播”的放大器的状态。 在这种操作状态下，光纤放大器产生具有抛物面形状的高能量脉冲（抛物线形状定义为时间的函数）。 这些脉冲还表现出强烈的线性啁啾，其中线性调频脉冲的线性特性导致脉冲的有效压缩。

    Short pulse lasers using large mode area fibers and higher order modes
    9.
    发明授权
    Short pulse lasers using large mode area fibers and higher order modes 有权
    使用大模光纤和较高阶模的短脉冲激光器

    公开(公告)号：US07228029B1

    公开(公告)日：2007-06-05

    申请号：US11230905

    申请日：2005-09-20

    申请人： Siddharth Ramachandran ,  Jeffrey Nicholson

    发明人： Siddharth Ramachandran ,  Jeffrey Nicholson

    IPC分类号： G02B6/26 ,  G02B6/02 ,  H01S3/30

    CPC分类号： G02B6/03633 ,  G02B6/02019 ,  G02B6/02023 ,  G02B6/02266 ,  H01S3/0057 ,  H01S3/06725

    摘要： The specification describes an optical fiber device for propagating and recompressing high energy, ultrashort pulses with minimal distortions due to nonlinearity. The device is based on propagation in a higher order mode (HOM) of a few-moded fiber. Coupling into the HOM may be accomplished using long-period gratings. Features of the HOM fiber mode that are useful for high quality pulse compression include large effective area, high dispersion and low dispersion slope. In a preferred case the long period gratings go through a turn-around point (TAP) at the wavelength of operation.

    摘要翻译： 本说明书描述了一种用于传播和再压缩由于非线性而具有最小失真的高能量，超短脉冲的光纤装置。 该器件基于几种光纤的高阶模式（HOM）的传播。 耦合到HOM可以使用长周期光栅来实现。 用于高质量脉冲压缩的HOM光纤模式的特征包括大的有效面积，高色散和低色散斜率。 在优选情况下，长周期光栅在操作波长处经过转折点（TAP）。

    Enhanced supercontinuum generation in highly nonlinear fibers using strong bragg gratings
    10.
    发明申请
    Enhanced supercontinuum generation in highly nonlinear fibers using strong bragg gratings 有权
    在使用强布拉格光栅的高度非线性光纤中增强超连续谱生成

    公开(公告)号：US20050226575A1

    公开(公告)日：2005-10-13

    申请号：US11063380

    申请日：2005-02-22

    申请人： Thomas Brown ,  Kenneth Feder ,  Yufeng Li ,  Jeffrey Nicholson ,  Paul Westbrook

    发明人： Thomas Brown ,  Kenneth Feder ,  Yufeng Li ,  Jeffrey Nicholson ,  Paul Westbrook

    IPC分类号： G02F1/35 ,  G02B6/00 ,  G02B6/02 ,  G02B6/34 ,  G02F1/365

    CPC分类号： G02B6/02028 ,  G02B6/021 ,  G02B6/02242 ,  G02F1/365

    摘要： Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by incorporating at least one Bragg grating structure in the HNLF. The Bragg grating results in reflecting a core-guided signal into signal which also remains core-guided. The supercontinuum radiation generated by such an arrangement will exhibit a substantial peak in its energy at the grating resonance of the Bragg grating and a region of increased radiation in a narrow wavelength band on the long wavelength side of the peak. A number of such Bragg gratings may be formed so as to “tailor” the enhancements provided in the supercontinuum radiation. Various, well-known Bragg grating modifications (tuning, chirped, blazed, etc.) may also be used in the inventive structure to enhance the generated supercontinuum.

    摘要翻译： 通过在HNLF中并入至少一个布拉格光栅结构来实现高非线性光纤（HNLF）的超连续谱生成性能的提高。 布拉格光栅导致将芯引导信号反射到信号中，该信号也保持核心引导。 由这种布置产生的超连续谱辐射将在布拉格光栅的光栅谐振处的能量中呈现出实质上的峰值，并且在峰值的长波长侧上在窄波长带中增加辐射的区域。 可以形成多个这样的布拉格光栅，以便“定制”超连续谱辐射中提供的增强。 各种众所周知的布拉格光栅修改（调谐，啁啾，闪耀等）也可以用于本发明的结构中以增强生成的超连续谱。