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Broadband Acoustic Vibration Sensor Based on Cladding-Mode Resonance of Double-Cladding Fiber 被引量:3
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作者 Guanghui SUI Huanhuan LIU +2 位作者 Fufei PANG Jiajing CHENG Tingyun WANG 《Photonic Sensors》 SCIE EI CAS CSCD 2019年第3期230-238,共9页
We have proposed and demonstrated a double-cladding fiber (DCF) with cladding?mode resonance property for broadband acoustic vibration sensing. Since the fundamental mode in the core waveguide is able to be coupled to... We have proposed and demonstrated a double-cladding fiber (DCF) with cladding?mode resonance property for broadband acoustic vibration sensing. Since the fundamental mode in the core waveguide is able to be coupled to LP05 mode in the tube waveguide once the phase-matching condition is fulfilled, the transmission spectrum can exhibit a dip with a large extinction ratio. An acoustic vibration could induce the wavelength shift of such transmission spectrum, so that the intensity variation at a wavelength near the dip is coded with the information of the acoustic vibration signal. By demodulating the response of intensity variation, the frequency of the applied acoustic vibration signal can be recovered. Such a DCF-based sensor with an intensity modulation could measure the acoustic vibration with a broadband frequency range from 1 Hz to 400 kHz and exhibits the maximum signal-to-noise ratio (SNR) of ?80.79 dB when the vibration frequency is 20 kHz. The obtained results show that the proposed DCF-based acoustic vibration sensor has a potential application in environmental assessment, structural damage detection, and health monitoring. 展开更多
关键词 double-cladding FIBER ACOUSTIC vibration sensor COAXIAL COUPLER
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An acousto-optic Q-switched fiber laser using China-made double-cladding fiber 被引量:4
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作者 赵宏明 楼祺洪 +5 位作者 周军 张芳沛 董景星 魏运荣 李立波 王之江 《Chinese Optics Letters》 SCIE EI CAS CSCD 2007年第9期522-523,共2页
A simple laser-diode pumped acoustic-optic Q-switched fiber laser is reported by using China-made largemode-area ytterbium-doped fiber. Q-switched pulses with a beam quality factor of M^2 ≈ 2 and several hundred nano... A simple laser-diode pumped acoustic-optic Q-switched fiber laser is reported by using China-made largemode-area ytterbium-doped fiber. Q-switched pulses with a beam quality factor of M^2 ≈ 2 and several hundred nanoseconds pulse duration are achieved at the repetition rate of 1 - 50 kHz. When the repetition rate is 1 kHz, the pulse energy is 0.93 mJ with the pulse duration of 132 ns. Meanwhile, the profile of laser pulses shows some mode-locking phenomena, the mechanism of the phenomena is discussed. 展开更多
关键词 AOM rate mode An acousto-optic Q-switched fiber laser using China-made double-cladding fiber
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10 Watts Double-Cladding Fiber Laser 被引量:1
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作者 Qihong Lou, Jun Zhou,Jianqiang Zhu, Zhijiang Wang Shanghai Institute of Optics and Fine Mechanics, CAS, P. R. China, Tel: 86-21-59910484, Fax: 86-21-59916703,E-mail: qhlou@mail.shcnc.ac.cn Graduate school of the Chinese Academy of science, Beijing, 100039, China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期385-386,共2页
Considering the wavelength characteristics of the pump high-power laser diode, a modified Fabry-Perot fiber laser resonator is designed. And a fiber laser with more than 10Watts output, near diffraction-limited and op... Considering the wavelength characteristics of the pump high-power laser diode, a modified Fabry-Perot fiber laser resonator is designed. And a fiber laser with more than 10Watts output, near diffraction-limited and operating in the 1110nm region is developed. 展开更多
关键词 high BE as is into Watts double-cladding Fiber Laser SPIE of for LD THAN
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Large-mode-area neodymium-doped all-solid double-cladding silicate photonic bandgap fiber with an index step of ~0.5% 被引量:1
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作者 Meng Li Longfei Wang +4 位作者 Shuai Han Chunlei Yu Danping Chen Wei Chen Lili Hu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第8期21-24,共4页
A large-mode-area neodymium-doped silicate photonic bandgap fiber was theoretically designed and experimen- tMly demonstrated. The relative index step between the high-index rods and the background glass was -0.5%, wh... A large-mode-area neodymium-doped silicate photonic bandgap fiber was theoretically designed and experimen- tMly demonstrated. The relative index step between the high-index rods and the background glass was -0.5%, which is the lowest cladding index difference reported on rare-earth-doped all-solid photonic bandgap fibers to our knowledge. An output power of 3.6 W with a slope efficiency of 31- was obtained for a 100-cm-long fiber. 展开更多
关键词 Large-mode-area neodymium-doped all-solid double-cladding silicate photonic bandgap fiber with an index step of
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A double-cladding fiber curvature sensor based on the extrinsic Fabry-Perot interferometer
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作者 FU Xing-hu WANG Dong +4 位作者 LIU Lian-xu LIU Fan WEN Jing FU Guang-wei BI Wei-hong 《Optoelectronics Letters》 EI 2019年第1期6-10,共5页
Based on the principle of Fabry-Perot (F-P) interference, a new type of optical fiber curvature sensor is presented,which is fabricated by single-mode fiber(SMF), ceramic tube and double-cladding fiber (DCF). And the ... Based on the principle of Fabry-Perot (F-P) interference, a new type of optical fiber curvature sensor is presented,which is fabricated by single-mode fiber(SMF), ceramic tube and double-cladding fiber (DCF). And the curvature sensing properties are analyzed, and the double-peak method is used to demodulate the cavity length. The experimental results show that the F-P interference spectrum shifts toward long wavelengths with increasing the curvature. And the sensors are placed in different positions on the cantilever to get their different curvature sensitivities. Smaller initial cavity length gives greater sensor sensitivity. The best curvature sensitivity is achieved as 2 554.53 pm/m^(-1) in 0.71—1.18 m^(-1). By demodulating the length of the F-P cavity, the cavity length of sensor 4 is changed by 0.08 mm. Therefore, the sensor has some potential for measure the small displacement. 展开更多
关键词 double-cladding FIBER FABRY-PEROT
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Absorption efficiency of graded-index double-clad fiber lasers
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作者 王子华 张辉 肖中银 《Journal of Shanghai University(English Edition)》 CAS 2006年第1期44-47,共4页
Absorption efficiency of graded-index double-clad fiber lasers or amplifiers is analyzed. As ray optics method is no longer valid for graded-index case, the mode analysis method is used. Calculated results show that a... Absorption efficiency of graded-index double-clad fiber lasers or amplifiers is analyzed. As ray optics method is no longer valid for graded-index case, the mode analysis method is used. Calculated results show that absorption efficiency for a graded-index is higher than that for a step-index in symmetric case. In offset core case, the graded-index can achieve the same absorption efficiency with much smaller offset distance. Absorption efficiencies for different graded-index profiles of the inner cladding are compared. 展开更多
关键词 pump absorption double-clad fibers graded-index multimode fibers.
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Fiber core mode leakage induced by refractive index variation in high-power fiber laser 被引量:1
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作者 闫平 王雪娇 +5 位作者 黄昱升 付晨 孙骏逸 肖起榕 李丹 巩马理 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第3期336-343,共8页
This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the... This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the power transfer between the core modes and the cladding modes during thermally-induced refractive index variations is established based on the mode coupling theory. The results of numerical simulations based on actual laser parameters are presented. Experimental measurements were also carried out, the results showed good agreement with the corresponding simulation results. 展开更多
关键词 double-clad fiber laser and amplifier Core loss cladding mode mode coupling theory
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Ultrasonic signal detection based on Fabry–Perot cavity sensor 被引量:1
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作者 Wu Yang Chonglei Zhang +1 位作者 Jiaqi Zeng Wei Song 《Visual Computing for Industry,Biomedicine,and Art》 EI 2021年第1期70-75,共6页
Acoustic/ultrasonic sensors are devices that can convert mechanical energy into electrical signals.The Fabry–Perot cavity is processed on the end face of the double-clad fiber by a two-photon three-dimensional lithog... Acoustic/ultrasonic sensors are devices that can convert mechanical energy into electrical signals.The Fabry–Perot cavity is processed on the end face of the double-clad fiber by a two-photon three-dimensional lithography machine.In this study,the outer diameter of the core cladding was 250μm,the diameter of the core was 9μm,and the microcavity sensing unit was only 30μm.It could measure ultrasonic signals with high precision.The characteristics of the proposed ultrasonic sensor were investigated,and its feasibility was proven through experiments.Its design has a small size and can replace a larger ultrasonic detector device for photoacoustic signal detection.The sensor is applicable to the field of biomedical information technology,including medical diagnosis,photoacoustic endoscopy,and photoacoustic imaging. 展开更多
关键词 Fabry-Perot microcavity double-clad fiber Acoustic sensor Endoscopic photoacoustic imaging Two-photon 3D lithography machine Full-optical detection
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Influence of Input Pulse Durations on Properties of Er^(3+)/Yb^(3+) Co-doped DCFA
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作者 ZHAN Sheng-bao ZHAO Shang-hong SHI Lei XU Jie ZHAO Xiao-ming 《Semiconductor Photonics and Technology》 CAS 2006年第3期205-210,共6页
Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er^3+/Yb^3+ co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteris... Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er^3+/Yb^3+ co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic of output power sag with pulse duration and repetition rate was shown. Whether single or multichannel input pulses are amplified, the shorter the input pulse duration is, the smaller the power sags of output pulse will be. At low repetition rate, upper gain values(Gupper) of gain swing are almost the same for different input pulse durations, which tend to the small signal gain, but lower gain value(Glower) of short input pulse is larger than that of long input pulse. At highrepetition rate, lower gain value(Glower) approaches to upper gain value(Glower). 展开更多
关键词 Er^3+/Yb^3+ co-doped double-clad fiber amplifier Pulse duration Pulse repetition rate
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The Formation of Fringes of Equal Chromatic Order across Double Clad Fiber in the Presence of High Power Lasers
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作者 Mona F. Omar Rania H. Abd El-Maksoud 《Optics and Photonics Journal》 2016年第2期29-38,共10页
Multiple-beam fringes of equal chromatic order interferometry is a powerful technique to extract optical properties over a continuous range of spectrum. In this paper we develop a theory for the spectral shape of the ... Multiple-beam fringes of equal chromatic order interferometry is a powerful technique to extract optical properties over a continuous range of spectrum. In this paper we develop a theory for the spectral shape of the fringes of equal chromatic order (FECO) that are formed across a double-clad fiber. The modified single term Sellmeier dispersion formula is used to construct the refractive index dispersion curves for the liquid, claddings, and core. Expressions for the paraxial optical path length for several rays passing through the fiber and the liquid are developed. The condition of bright fringe is applied to get an analytical expression for the spectral shape of the FECO across a double-clad fiber with an elliptical/circular inner cladding. A potential application of this theory is to determine the dispersion of Kerr constant of the claddings and the core of the fiber. To illustrate the theory and its application, simulation examples are provided and discussed. 展开更多
关键词 INTERFERENCE Physical Optics DISPERSION Nonlinear Optics Fringes of Equal Chromatic Order double-clad Fibers
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A strain-induced birefringent double-clad fiber Bragg grating 被引量:2
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作者 李丽君 孙磊 +5 位作者 范万德 王志 罗建花 付圣贵 袁树忠 董孝义 《Chinese Optics Letters》 SCIE EI CAS CSCD 2005年第7期383-385,共3页
A strain-induced birefringence double-clad (DC) fiber Bragg grating (FBG) is proposed and demonstrated. The grating is fabricated in the core of rectangular inner cladding double clad fiber by using phase mask method.... A strain-induced birefringence double-clad (DC) fiber Bragg grating (FBG) is proposed and demonstrated. The grating is fabricated in the core of rectangular inner cladding double clad fiber by using phase mask method. By applying lateral strain on the grating, the birefringence is induced. In order to detect the birefringent effect of the grating, we use it as the output mirror of a laser. When lateral strain is applied, the grating becomes birefringent. Therefore, one reflection peak of double-clad fiber Bragg grating becomes two peaks and the laser also lases in two wavelengths. The wavelength spacing of the laser can be tuned from 0 to 0.8 nm. The absolute wavelengths for the two polarizations can be tuned 1.2 and 2.0 nm, respectively. 展开更多
关键词 FBG In A strain-induced birefringent double-clad fiber Bragg grating
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A 110-W fiber laser with homemade double-clad fiber 被引量:1
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作者 薛冬 楼祺洪 +3 位作者 周军 孔令峰 李进延 李诗愈 《Chinese Optics Letters》 SCIE EI CAS CSCD 2005年第6期345-347,共3页
A high-power ytterbium-doped fiber laser (YDFL) with homemade double-clad fiber (DCF) is introduced in this letter. The geometric parameter and laser characteristics of the fiber have been studied. With oneend-pumping... A high-power ytterbium-doped fiber laser (YDFL) with homemade double-clad fiber (DCF) is introduced in this letter. The geometric parameter and laser characteristics of the fiber have been studied. With oneend-pumping scheme, pumped by a high-power laser diode with launching power of 280 W, a maximum continuous wave (CW) output of 110 W is obtained with an optical-to-optical efficiency of 40%. 展开更多
关键词 110 A 110-W fiber laser with homemade double-clad fiber MODE HIGH DCF
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Spectrum characteristics and pump wavelengths of Nd_(3+) -doped double-clad fiber
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作者 MING Hai, YANG Bao, DONG Xiaopeng, A. Fedotov, Xudong Xiao and M. M. T. Loy1. Department of Physics, University of Science and Technology of China, Hefei 230026, China 2. Department of Physics, University of Science and Technology of Hong Kong, Hong Kong, China 《Chinese Science Bulletin》 SCIE EI CAS 1997年第11期897-900,共4页
Nd<sup>3+</sup> -doped double-clad fiber is a new type of fiber that has large N.A.and large receivingarea compared with single-clad rare-earth-doped fiber.So Nd<sup>3+</sup>-doped double-clad ... Nd<sup>3+</sup> -doped double-clad fiber is a new type of fiber that has large N.A.and large receivingarea compared with single-clad rare-earth-doped fiber.So Nd<sup>3+</sup>-doped double-clad fiberpumped directly by laser-diode arrays can be manufactured into high-power fiber lasers,high-power superfluorescence sources and high-gain fiber amplifiers,and they will be applied 展开更多
关键词 double-clad fiber OPTIMUM PUMP WAVELENGTH optical spectrum.
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The Absorption Characteristics of Inhomogeneous Double-Clad Fibers
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作者 Hui Zhang Zihua Wang Zhongyin Xiao (School of Communication and Information Engineering, Shanghai University, Shanghai, 200072, P.R.China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期70-71,共2页
The absorption characteristics of radially inhomogeneous double-clad fiber (DCF) are investigated firstly with the method of caustic radius, combined with the method of WKBJ. The results are significant for double-cla... The absorption characteristics of radially inhomogeneous double-clad fiber (DCF) are investigated firstly with the method of caustic radius, combined with the method of WKBJ. The results are significant for double-clad optical fiber lasers and amplifiers. 展开更多
关键词 of ET In AS The Absorption Characteristics of Inhomogeneous double-clad Fibers MODE DCF for into
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Fabrication and Lasing Property of Yb^(3+)-doped Double-Clad Fibers with Novel Inner Cladding
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作者 Ding Ming Yang Xiang Zhaowen Xu Wande Fan Yongqing Yi Shuzhong YuanXiaoyi Dong 46th Institute, Chinese Electronics Technology Group Inc., Tianjin P. R. China, Tel:86-22-88111648,Fax:86-22-88111026, E-mail:ningdingnd@sina.com Institute of Modern Optics, Nankai University, Tianjin P. R. China, Tel:86-22-23509849, Fax:86-22-23508770 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期94-95,共2页
The Yb3+-doped double-clad fibers with novel inner cladding have been made by using MCVD process, solution-doping method and optical machining together. The laser power and slope efficiency of the fiber lasers are hig... The Yb3+-doped double-clad fibers with novel inner cladding have been made by using MCVD process, solution-doping method and optical machining together. The laser power and slope efficiency of the fiber lasers are higher than 1.8W and 50% respectively. 展开更多
关键词 of as on for doped double-clad Fibers with Novel Inner Cladding Fabrication and Lasing Property of Yb with
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