A piece of multimode optical fiber with a low num er ical aperture (NA) is used as an inexpensive microlens to collimate the output r adiation of a laser diode bar in the high numerical aperture (NA) direction.The em...A piece of multimode optical fiber with a low num er ical aperture (NA) is used as an inexpensive microlens to collimate the output r adiation of a laser diode bar in the high numerical aperture (NA) direction.The emissions of the laser diode bar are coupled into multimode fiber array.The radi ation from individual ones of emitter regions is optically coupled into individu al ones of fiber array.Total coupling efficiency and fiber output power are 75% and 15W,respectively.展开更多
The output radiation from the 100μm×1μm aperture of a high power Laser Diode (LD) is efficiently coupled into a 50μm multimode optical fiber.The fiber output of the high power LD with high brightness and high ...The output radiation from the 100μm×1μm aperture of a high power Laser Diode (LD) is efficiently coupled into a 50μm multimode optical fiber.The fiber output of the high power LD with high brightness and high power density is achieved.The power density is up to 3 6×104W/cm2 and the coupling efficiency is 70%.The extreme divergence and the astigmatism of high power LDs require the optics with complex lens structures and high performance.A double-curved lens with two crossed cylindrical lenses structured on both sides of the glass substrate is used in the coupling system.展开更多
According to the principle of choosing the light source in the fiber optic sensing measurement,semiconductor laser is used as the light source of fiber optic sensor and single-mode fiber is used as the tail fiber of l...According to the principle of choosing the light source in the fiber optic sensing measurement,semiconductor laser is used as the light source of fiber optic sensor and single-mode fiber is used as the tail fiber of light source. Based on optical design software Zemax’s pure non-sequential components,a coupling system of semiconductor laser and single-mode fiber is designed. By analyzing the beam characteristics of the semiconductor laser and the coupled mode theory of semiconductor laser and single-mode fiber,the combined lens consists of a ball lens and a collimating lens for the purpose of improving the coupling efficiency and adjusting tolerance. The simulation results show that the coupling efficiency can reach about 78% by using one million ray traces on non-sequential components,while the experimental test result is 69.11%,accordingly,the reasons for the difference between the experiment and the simulation results are analyzed.展开更多
TH773 2000010715小型NAB光纤耦合医用激光器=Minature NABoptical fibre coupled lasers for medical applications[刊,中]/黄奕川,邱闽旺,陈光,陈金华,赵挺洁,江爱栋,罗遵度（中科院福建物构所.福建,福州（350002））//量子电子学报....TH773 2000010715小型NAB光纤耦合医用激光器=Minature NABoptical fibre coupled lasers for medical applications[刊,中]/黄奕川,邱闽旺,陈光,陈金华,赵挺洁,江爱栋,罗遵度（中科院福建物构所.福建,福州（350002））//量子电子学报.—1998,15（3）.—308-310报道了以（Φ3×21）mm<sup>3</sup>的小型脉冲氙灯泵浦（Φ3×21）mm<sup>3</sup>的NAB晶体的脉冲激光器,通过聚焦系统和光纤耦合组成体积小、重量轻、携带方便的小型光纤耦合医用激光器。图4参4（于晓光）TH773 2000010716低功率CO<sub>2</sub>激光血管焊接机的微机控制系统研究=Study of a low power CO<sub>2</sub> laser blood展开更多
We report periodical rocking long period gratings(PR-LPGs) in PANDA fibers fabricated with CO_2 laser. The PR-LPGs achieve very high coupling efficiency of 19 dB with 12 periods and a 3.5° twist angle in just one...We report periodical rocking long period gratings(PR-LPGs) in PANDA fibers fabricated with CO_2 laser. The PR-LPGs achieve very high coupling efficiency of 19 dB with 12 periods and a 3.5° twist angle in just one scanning cycle, which is much more effective than the conventional CO_2 laser fabrication technique. This type of LPGs exhibits polarization-selective resonance dips which demonstrate different sensitivities to environmental parameters. The high temperature and external refractive index sensitivities are measured simultaneously, so it can be used as a wavelength-selective polarization filter and sensor.展开更多
Starting from a rudimentary quantum-networks model that consists of two two-level confined atoms locating respectively in spatially-separated cavities coupled by fiber,we investigate the complex entanglement character...Starting from a rudimentary quantum-networks model that consists of two two-level confined atoms locating respectively in spatially-separated cavities coupled by fiber,we investigate the complex entanglement characteristics of the composite system analytically under the maximally initial entangled state that generates two excitations simultaneously during the temporal-evolution process.Our calculation clearly shows that,through mediating the atom-cavity coupling strength and photon-photon hopping rate appropriately,the entanglement dynamics displays some distinctive temporal properties differing from those obtained in one-excitation space,characterized partially by these newly quantum phenomena termed as entanglement sudden death and recurrence.Effectively,within the framework of two excitations,we suggest the purposeful manipulations of atomic entanglement communication for quantum networks.展开更多
文摘A piece of multimode optical fiber with a low num er ical aperture (NA) is used as an inexpensive microlens to collimate the output r adiation of a laser diode bar in the high numerical aperture (NA) direction.The emissions of the laser diode bar are coupled into multimode fiber array.The radi ation from individual ones of emitter regions is optically coupled into individu al ones of fiber array.Total coupling efficiency and fiber output power are 75% and 15W,respectively.
文摘The output radiation from the 100μm×1μm aperture of a high power Laser Diode (LD) is efficiently coupled into a 50μm multimode optical fiber.The fiber output of the high power LD with high brightness and high power density is achieved.The power density is up to 3 6×104W/cm2 and the coupling efficiency is 70%.The extreme divergence and the astigmatism of high power LDs require the optics with complex lens structures and high performance.A double-curved lens with two crossed cylindrical lenses structured on both sides of the glass substrate is used in the coupling system.
基金Youth Science and Technology Research Foundation of Shanxi Province(No.2015021104)Programs for Science and Technology Development of Shanxi Province(No.201703D121028-2)
文摘According to the principle of choosing the light source in the fiber optic sensing measurement,semiconductor laser is used as the light source of fiber optic sensor and single-mode fiber is used as the tail fiber of light source. Based on optical design software Zemax’s pure non-sequential components,a coupling system of semiconductor laser and single-mode fiber is designed. By analyzing the beam characteristics of the semiconductor laser and the coupled mode theory of semiconductor laser and single-mode fiber,the combined lens consists of a ball lens and a collimating lens for the purpose of improving the coupling efficiency and adjusting tolerance. The simulation results show that the coupling efficiency can reach about 78% by using one million ray traces on non-sequential components,while the experimental test result is 69.11%,accordingly,the reasons for the difference between the experiment and the simulation results are analyzed.
文摘TH773 2000010715小型NAB光纤耦合医用激光器=Minature NABoptical fibre coupled lasers for medical applications[刊,中]/黄奕川,邱闽旺,陈光,陈金华,赵挺洁,江爱栋,罗遵度（中科院福建物构所.福建,福州（350002））//量子电子学报.—1998,15（3）.—308-310报道了以（Φ3×21）mm<sup>3</sup>的小型脉冲氙灯泵浦（Φ3×21）mm<sup>3</sup>的NAB晶体的脉冲激光器,通过聚焦系统和光纤耦合组成体积小、重量轻、携带方便的小型光纤耦合医用激光器。图4参4（于晓光）TH773 2000010716低功率CO<sub>2</sub>激光血管焊接机的微机控制系统研究=Study of a low power CO<sub>2</sub> laser blood
基金supported by the National Natural Science Foundation of China(No.61605168)the Natural Science Foundation of Hebei Province(No.F2016203392)+2 种基金the College and University Natural Science Foundation of Hebei Province(No.QN2016078)the Science and Technology Project of Qinhuangdao City(No.201601B050)the Intramural Doctoral Foundation of Yanshan Universtiy(No.B1011)
文摘We report periodical rocking long period gratings(PR-LPGs) in PANDA fibers fabricated with CO_2 laser. The PR-LPGs achieve very high coupling efficiency of 19 dB with 12 periods and a 3.5° twist angle in just one scanning cycle, which is much more effective than the conventional CO_2 laser fabrication technique. This type of LPGs exhibits polarization-selective resonance dips which demonstrate different sensitivities to environmental parameters. The high temperature and external refractive index sensitivities are measured simultaneously, so it can be used as a wavelength-selective polarization filter and sensor.
基金supported by the National Basic Research Program of China (Grant No. 2012CB921900)the National Natural Science Foundation of China (Grant No. 10574166)the Guangdong Natural Science Foundation (Grant No. 8151027501000062)
文摘Starting from a rudimentary quantum-networks model that consists of two two-level confined atoms locating respectively in spatially-separated cavities coupled by fiber,we investigate the complex entanglement characteristics of the composite system analytically under the maximally initial entangled state that generates two excitations simultaneously during the temporal-evolution process.Our calculation clearly shows that,through mediating the atom-cavity coupling strength and photon-photon hopping rate appropriately,the entanglement dynamics displays some distinctive temporal properties differing from those obtained in one-excitation space,characterized partially by these newly quantum phenomena termed as entanglement sudden death and recurrence.Effectively,within the framework of two excitations,we suggest the purposeful manipulations of atomic entanglement communication for quantum networks.
