公开(公告)号：US11158990B2

公开(公告)日：2021-10-26

申请号：US16352646

申请日：2019-03-13

申请人： Nufern

发明人： Daniel J. Creeden

IPC分类号： H01S3/094 ,  H01S3/04 ,  H01S3/067 ,  H01S5/068 ,  H01S3/102 ,  H01S5/14 ,  H01S3/16

摘要： The present disclosure relates to optical fiber amplifying systems having operability at a wide variety of ambient temperatures and to methods for using them. One aspect of the disclosure is an optical fiber system configured to provide amplified radiation. The system includes an active optical fiber; a plurality of grating-locked pump sources, each having an output optically coupled to the active optical fiber; one or more temperature sensors, configured to measure a temperature associated with one or more of the grating-locked pump sources; and a control system configured to accept measurements from the one or more temperature sensors and, for a desired total pump power output, to provide to one or more of the grating-locked pump sources a set of drive currents suitable to provide the desired total pump power output.

公开(公告)号：US11005227B2

公开(公告)日：2021-05-11

申请号：US16562365

申请日：2019-09-05

申请人： Nufern

发明人： Peyman Ahmadi ,  Peter Andrew Rosenthal

IPC分类号： H01S3/067 ,  B23K26/06 ,  H01S3/10 ,  H01S3/109 ,  H01S3/23

摘要： A high-power fiber laser produces a compound output beam having a center beam and an annular beam. The center beam and the annular beam are independently adjustable in power and wavelength. The output beam is delivered from an output optical fiber having a center core and a concentric annular core. A fundamental beam generated by a seed laser is amplified by a fiber amplifier and partially converted to a second-harmonic beam by a second-harmonic generator. The residual fundamental beam and second-harmonic beam are separated, attenuated, and selectively coupled into the cores of the output optical fiber.

公开(公告)号：US20200335928A1

公开(公告)日：2020-10-22

申请号：US16849665

申请日：2020-04-15

申请人： Nufern

发明人： Mitchell UNDERWOOD, III

IPC分类号： H01S3/067 ,  H01S3/08

摘要： An optical apparatus for depolarizing a laser beam within a fiber MOPA laser is disclosed. The apparatus includes a first phase modulator for spectral broadening, a linear polarizer, an optical coupler, a second phase modulator for depolarizing the laser beam, and a polarization-maintaining optical fiber. The optical coupler divides a linearly-polarized portion of the laser beam equally between fast and slow axes of the second phase modulator. The laser beam delivered by the polarization-maintaining optical fiber is truly unpolarized. The apparatus provides independent control of the spectral broadening and the depolarization to mitigate stimulated Brillouin scattering during subsequent amplification. A method for depolarizing a laser beam, using this apparatus, is also disclosed.

公开(公告)号：US10680401B2

公开(公告)日：2020-06-09

申请号：US15168981

申请日：2016-05-31

申请人： Brandon Redding ,  Peyman Ahmadi ,  Martin Seifert ,  Hui Cao

发明人： Brandon Redding ,  Peyman Ahmadi ,  Martin Seifert ,  Hui Cao

IPC分类号： H01S3/16 ,  H01S3/094 ,  G02B27/48 ,  G01B11/14 ,  H01S3/00 ,  G01J3/02 ,  G02B6/02 ,  G01S17/00 ,  G01S7/481 ,  G01S7/4911 ,  G01J3/10 ,  G01J3/18 ,  H01S3/067

摘要： The present disclosure relates more particularly to active optical fibers, amplified spontaneous emission (ASE) sources using such active optical fibers, and imaging and detection systems and methods using such ASE sources. In one aspect, the disclosure provides an active optical fiber that includes a rare earth-doped gain core configured to emit radiation at at least a peak wavelength emitted wavelength when pumped with pump radiation having a pump wavelength; a pump core surrounding the gain core; and a cladding surrounding the pump core, wherein the value M=16R2(NA)2/λ2 in which R is the gain core radius, NA is the active optical fiber numerical aperture, and λ is the peak emitted wavelength, is at least 50, or at least 100. The present disclosure also provides an optical source that includes the optical fiber coupled to a pump source.

公开(公告)号：US10483711B2

公开(公告)日：2019-11-19

申请号：US15555802

申请日：2016-03-04

申请人： NUFERN

发明人： Peyman Ahmadi

IPC分类号： H01S3/30 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  G02F1/01 ,  H01S3/0941 ,  H01S3/00

摘要： The present disclosure relates to methods and apparatuses for providing optical radiation having improved rise/fall times and improved levels of leakage. One method for amplifying optical radiation includes an intermediate stage (220) having an intermediate active optical fiber (222), the intermediate active optical fiber and a final amplifying stage (230) including a final active optical fiber (232), and providing optical radiation to the input of the intermediate active optical fiber, wherein one or more final optical pump sources (235) are together in a low power state such that the optical radiation is substantially absorbed by the intermediate active optical fiber and such that substantially no optical radiation of the amplified wavelength is transmitted by the intermediate stage. The intermediate active optical fiber (222) can then be switched to a transmissive state by switching the final optical pump source(s) (235) to a high power state. The input to the intermediate stage may comprise a seed laser (205) and plural first amplifier stages (210) having each a first active optical fiber (212). A filter (260) between the intermediate stage (220) and the final amplifying stage (230) prevents ASE and pump light from the intermediate stage to reach the final amplifying stage.

公开(公告)号：US09819143B2

公开(公告)日：2017-11-14

申请号：US14899991

申请日：2014-06-23

申请人： NUFERN

发明人： Peyman Ahmadi ,  Imtiaz Majid ,  Cyril Guintrand

IPC分类号： H01S3/067 ,  H01S3/13 ,  H01S3/10 ,  G02B6/024 ,  H01S3/00

CPC分类号： H01S3/1308 ,  G02B6/024 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/10061 ,  H01S3/1301

摘要： Methods and apparatuses for determining the polarization state and for providing polarization control in optical fiber lasers and amplifiers. One embodiment of the invention is an optical fiber amplifying system including a circulator (260) having a first optical port (260a), a second optical port (260b) that is configured to output radiation received from the first optical port, and a third optical port (260c) that is configured to output radiation received from the second optical port; one or more amplifier stages (216) connected in series, together having an optical input (216a) optically coupled to the second port of the circulator, and an optical output (216b); and a polarization detector (240) having an optical input optically coupled to the third port of the circulator. Thereby the polarization state of the amplified radiation can be determined using radiation backscattered from the amplifying stage.

公开(公告)号：US08849083B1

公开(公告)日：2014-09-30

申请号：US13458945

申请日：2012-04-27

申请人： Bryce N. Samson ,  Kanxian Wei ,  Liang Dong

发明人： Bryce N. Samson ,  Kanxian Wei ,  Liang Dong

IPC分类号： G02B6/032 ,  G02B6/02

CPC分类号： G02B6/02357 ,  G02B6/02019 ,  G02B6/02333 ,  G02B6/02347 ,  G02B6/02361

摘要： The present invention relates generally to optical waveguides, and more particularly to optical fibers suitable for use with high optical energies, and to devices using them. One aspect of the invention is an optical fiber having a cross-sectional profile comprising a base glass material; a first ring of first low refractive index glass features disposed in the base glass material; and a second ring of second low refractive index glass features disposed in the base glass material outside of and substantially concentric with the first ring, wherein the optical fiber has a loss of less than about 0.7 dB/m for the fundamental mode and a loss greater than about 10 dB/m for all other modes in a coiled configuration having a coil diameter in the range of about 20 cm to about 200 cm.

摘要翻译： 本发明一般涉及光波导，更具体地涉及适用于高光能的光纤以及使用它们的器件。 本发明的一个方面是具有包括基础玻璃材料的横截面轮廓的光纤; 设置在基底玻璃材料中的第一低折射率玻璃特征的第一环; 以及第二低折射率玻璃特征环，其设置在第一环外部并基本上与第一环同心的基础玻璃材料中，其中光纤对于基模具有小于约0.7dB / m的损耗，并且损耗更大 对于线圈直径在约20cm至约200cm范围内的盘绕构型中的所有其它模式而言，约10dB / m。

公开(公告)号：US20110310913A1

公开(公告)日：2011-12-22

申请号：US13220511

申请日：2011-08-29

申请人： Gavin P. Frith

发明人： Gavin P. Frith

IPC分类号： H01S3/1055 ,  G02B6/26

CPC分类号： G02B6/14 ,  G02B6/4206 ,  G02B6/4296 ,  H01S3/005 ,  H01S3/06708 ,  H01S3/0675 ,  H01S3/2308

摘要： Optical fiber lasers and components for optical fiber laser. An optical fiber laser can comprise a fiber laser cavity having a wavelength of operation at which the cavity provides output light, the cavity including optical fiber that guides light having the wavelength of operation, the fiber having first and second lengths, the first length having a core having a V-number at the wavelength of operation and a numerical aperture, the second length having a core that is multimode at the wavelength of operation and that has a V-number that is greater than the V-number of the core of the first length optical fiber at the wavelength of operation and a numerical aperture that is less than the numerical aperture of the core of the first length of optical fiber. At least one of the lengths comprises an active material that can provide light having the wavelength of operation via stimulated emission responsive to the optical fiber receiving pump light. Components include a mode field adapter and optical fiber interconnection apparatus, which can be used to couple the first and second lengths of optical fiber, or can couple the fiber laser to an optical fiber power amplifier, which can be a multimode or single mode amplifier.

摘要翻译： 光纤激光器和光纤激光器组件。 光纤激光器可以包括具有工作波长的光纤激光腔，空腔在该波长处提供输出光，该腔包括引导具有波长工作波长的光纤，光纤具有第一和第二长度，第一长度具有 在工作波长处具有V号和数值孔径的第二长度具有在操作波长处为多模的核并且具有大于所述核心的V数的V数 在操作波长处的第一长度光纤和小于第一长度光纤的芯的数值孔径的数值孔径。 长度中的至少一个包括能够响应于光纤接收泵浦光而通过受激发射提供具有操作波长的光的活性材料。 组件包括模式现场适配器和光纤互连设备，其可以用于耦合第一和第二长度的光纤，或者可以将光纤激光器耦合到可以是多模或单模放大器的光纤功率放大器。

公开(公告)号：US07724422B2

公开(公告)日：2010-05-25

申请号：US10597592

申请日：2005-01-31

申请人： Jaroslaw Abramczyk ,  Upendra H. Manyam ,  Bryce N. Samson ,  Kanishka Tankala

发明人： Jaroslaw Abramczyk ,  Upendra H. Manyam ,  Bryce N. Samson ,  Kanishka Tankala

IPC分类号： H01S3/00

CPC分类号： G02B6/14 ,  G02B6/024 ,  G02B6/105 ,  H01S3/06712 ,  H01S3/06729 ,  H01S3/0675 ,  H01S3/094007 ,  H01S3/0941 ,  H01S3/1618

摘要： Optical apparatus (110, 500, 600, 800, 1000) for providing light having a selected linear polarization having a polarization ratio, the apparatus (110, 500, 600, 800, 1000) comprising a length of optical fiber (120, 504, 604, 804, 1001) comprising a rare earth for providing light having a first wavelength responsive to receiving pump light having a second wavelength that is different than said first wavelength, wherein if the length of optical fiber (120, 504, 604, 804, 1004) were placed in a first position between the length of fiber (120, 504, 604, 804, 1004) is substantially linearly oriented (20) the fiber (120, 504, 604, 804, 1004) could propagate at the first wavelength a fundamental mode and a plurality of higher order modes and the apparatus (110, 500, 600, 800, 1000) could provide light having a first polarization ratio for the selected linear polarization and an M2 parameter, and wherein the length of fiber (120, 504, 604, 804, 1004) is positioned in a second position that increases the bend loss of the fiber relative to the first position such that, responsive to the increased bend loss, the apparatus (110, 500, 600, 800, 1000) can provide light having a reduced M2 parameter as well as a second polarization ratio for the selected polarization that is increased relative to the first polarization ratio, the increase being at least 6 dB greater than the first polarization ratio, and wherein when the length of fiber (120, 504, 604, 804, 1004) is in the second position the apparatus (110, 500, 600, 800, 1000) can provide a slope efficiency that is at least 50% of the ratio of the second wavelength to the first wavelength.

摘要翻译： 用于提供具有偏振比的所选线性偏振光的光学装置（110,500,600,800,1000），所述装置（110,500,600,800,1000）包括一段长度的光纤（120,504， 包括稀土，用于提供响应于接收具有不同于所述第一波长的第二波长的泵浦光的具有第一波长的光，其中如果光纤的长度（120,504,604,801， 1004）被放置在光纤（120,504,604,804,1004）的长度之间的第一位置，基本上线性地定向（20），光纤（120,504,604,804,1004）可以在第一波长处传播 基本模式和多个高阶模式，并且所述装置（110,500,600,800,1000）可以提供具有用于所选择的线性偏振的第一偏振比的光和M2参数，并且其中光纤的长度（120 ，504,604,804,1004）定位在第二位置， 折射纤维相对于第一位置的弯曲损耗，使得响应于增加的弯曲损耗，装置（110,500,600,800,1000）可以提供具有减小的M2参数以及第二偏振比的光 对于相对于第一偏振比增加的所选偏振，增加比第一偏振比大至少6dB，并且其中当光纤（120,504,604,804,1004）的长度在第二偏振比 定位装置（110,500,600,800,1000）可以提供至少为第二波长与第一波长的比率的50％的斜率效率。

公开(公告)号：US20100008634A1

公开(公告)日：2010-01-14

申请号：US12562749

申请日：2009-09-18

申请人： Douglas Guertin ,  Nils Jacobson ,  Kanishka Tankala ,  Adrian Carter

发明人： Douglas Guertin ,  Nils Jacobson ,  Kanishka Tankala ,  Adrian Carter

IPC分类号： G02B6/036 ,  C03B37/02

CPC分类号： C03B37/01222 ,  C03B37/01228 ,  C03B37/01231 ,  C03B37/02763 ,  C03B2203/18 ,  C03B2203/20 ,  C03B2203/32 ,  C03B2203/34 ,  C03B2205/06 ,  C03B2205/07 ,  G02B6/02042 ,  H01S3/06704 ,  H01S3/06708

摘要： An optical fiber preform, and method for fabricating, having a first core, a second core spaced from the first core and first and second regions, the first region having an outer perimeter having a first substantially straight length and the second region having an outer perimeter having a second substantially straight length facing the first straight length. One of the regions can comprise the first core and the other comprises the second core. The preform can be drawn with rotation to provide a fiber wherein a first core of the fiber is multimode at a selected wavelength of operation and a second core of the fiber is spaced from and winds around the first core and has a selected longitudinal pitch. The second core of the fiber can couple to a higher order mode of the first core and increase the attenuation thereof relative to the fundamental mode of the first core.

摘要翻译： 一种光纤预制件及其制造方法，具有第一芯体，与第一芯体以及第一和第二区域隔开的第二芯体，第一区域具有第一基本上直的长度的外周边，第二区域具有外周边 具有面向第一直线长度的第二基本上直的长度。 其中一个区域可以包括第一核心，另一个包括第二核心。 预成型件可以旋转拉伸以提供纤维，其中纤维的第一纤芯在所选波长的操作下是多模的，并且纤维的第二纤芯与第一纤芯间隔开并卷绕第一纤芯并具有选定的纵向间距。 光纤的第二核心可以耦合到第一核心的更高阶模式并且相对于第一核心的基本模式增加其衰减。