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101. 发明授权

US11228154B2 Fiber polarisation scrambler 有权
公开(公告)号：US11228154B2
公开(公告)日：2022-01-18
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 , H01S3/23
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.

102. 发明授权

US11158990B2 Optical fiber amplifier system and methods of using same 有权
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.

103. 发明授权

US11005227B2 Multi-wavelength adjustable-radial-mode fiber laser 有权
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.

104. 发明授权

US10837778B2 Large-dynamic-range fiber optic gyroscope 有权
公开(公告)号：US10837778B2
公开(公告)日：2020-11-17
申请号：US16383106
申请日：2019-04-12
申请人： Nufern
发明人： Jan Amir Khan , David Paquette
IPC分类号： G01C19/72
CPC分类号： G01C19/726 , G01C19/721
摘要： A method for operating a fiber optic gyroscope to measure angular velocity uses a closed-loop modulation scheme. Two-state modulation voltages are applied to an optical modulator and continuously adjusted to maintain a null difference between corresponding demodulated voltages from a photodetector. If one of the modulation voltages reaches a threshold voltage, the continuous nulling adjustment is interrupted briefly while the two-state modulation voltages are reset to values that correspond to relative phases of π/2 and −π/2 when the gyroscope is stationary, then the continuous adjustment is resumed. This reoccurring resetting, while the gyroscope accelerates or decelerates, substantially increases the dynamic range over which the gyroscope can precisely measure angular velocity.

105. 发明申请

US20200335928A1 FIBER POLARISATION SCRAMBLER 审中-公开
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.

106. 发明授权

US10680401B2 Sources of optical radiation and methods for providing low-speckle optical radiation, and systems and methods using them 有权
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.

107. 发明授权

US10483711B2 Method and apparatus for providing amplified radiation 有权
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.

108. 发明授权

US09819143B2 Method and apparatus for polarization determination and/or control in optical fiber amplifying systems 有权
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.

109. 发明授权

US08849083B1 All glass leakage channel fibers and devices using them 有权
标题翻译：所有玻璃泄漏通道纤维和使用它们的设备
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。

110. 发明申请

US20110310913A1 OPTICAL FIBER LASER, AND COMPONENTS FOR AN OPTICAL FIBER LASER, HAVING REDUCED SUSCEPTIBILITY TO CATASTROPHIC FAILURE UNDER HIGH POWER OPERATION 有权
标题翻译：光纤激光器和光纤激光器的组件，具有降低对大功率操作下的故障的可能性
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。

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