检索结果-南通市图书馆

Towards visible-wavelength passively mode-locked lasers in all-fibre format

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 1438-1447页

作者： jinhai zou Chuchu Dong Hongjian Wang Tuanjie Du Zhengqian Luo Department of Electronic Engineering Xiamen University361005 XiamenChina

Mode-locked fibre lasers(MLFLs)are fundamental building blocks of many photonic systems used in industrial,scientific and biomedical *** date,1–2μm MLFLs have been well developed;however,passively modelocked fibre lasers in the visible region(380–760 nm)have never been ***,we address this challenge by demonstrating an all-fibre visible-wavelength passively mode-locked picosecond laser at 635 *** 635 nm mode-locked laser with an all-fibre figure-eight cavity uses a Pr/Yb codoped ZBLAN fibre as the visible gain medium and a nonlinear amplifying loop mirror as the mode-locking ***,we theoretically predict and analyse the formation and evolution of 635 nm mode-locked pulses in the dissipative soliton resonance(DSR)regime by solving the Ginzburg-Landau ***,we experimentally demonstrate the stable generation of 635 nm DSR mode-locked pulses with a pulse duration as short as~96 ps,a radio-frequency signal-to-noise ratio of 67 dB and a narrow spectral bandwidth of 1 nm)and modulated optical *** work represents an important step towards miniaturized ultrafast fibre lasers in the visible spectral region.

关键词： passive fibre visible

212-kHz-linewidth,transform-limited pulses from a single-frequency Q-switched fiber laser based on a few-layer Bi_2Se_3 saturable absorber

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2018年第10期6卷 I0031-I0037页

作者： WEIWEI LI jinhai zou YIZHONG HUANG KAIJIE WANG TUANJIE DU SHUISEN JIANG ZHENGQIAN LUO Department of Electronic Engineering Xiamen University

Conventional Q-switched fiber lasers operating at multi-longitudinal-mode oscillation usually suffer from selfmode-locking-induced temporal instability, relatively strong noise, and low coherence. Here, we address the challenge through demonstrating, for the first time, to the best of our knowledge, a single-longitudinal-mode(SLM)Er-doped fiber(EDF) laser passively Q-switched by a few-layer Bi_2Se_3 saturable absorber(SA). The Bi_2Se_3 SA prepared by the liquid-phase exfoliation method shows a modulation depth of ～5% and saturation optical intensity of 1.8 MW∕cm^2. A section of 1-m unpumped EDF together with a 0.06-nm-bandwidth fiber Bragg grating is used as an ultra-narrow autotracking filter to realize SLM oscillation. Stable SLM Q-switching operation at 1.55 μm is successfully achieved with the spectral linewidth as narrow as 212 kHz and the pulse duration of2.54 μs, manifesting near-transform-limited pulses with a time-bandwidth product of 0.53. In particular, we found that the SLM Q-switching possesses the higher signal-to-noise ratios of 62 dB(optical) and 48 dB(radio frequency), exhibiting its advantages of low noise and high stability. Such an SLM Q-switched fiber laser could gain great interest for some applications in coherent detection, coherent optical communications, and high-sensitivity optical sensing.

关键词：光纤激光器通讯技术发展现状技术创新

Visible-light all-fiber vortex lasers based on mode selective couplers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 136-141页

作者： Chuchu Dong jinhai zou Hongjian Wang Han Yao Xianglong Zeng Yikun Bu Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China The Key Laboratory of Specialty Fiber Optics and Optical Access Network Shanghai UniversityShanghai 200444China

We demonstrate visible-light all-fiber vortex lasers by incorporating the home-made mode selective couplers (MSCs). The MSC at green or red wavebands is fabricated by specially designing and fusing a single-mode fiber (SMF) and a few-mode fiber (FMF). The MSCs inserted into visible fiber cavities act as power splitters and mode converters from the LP01 to LP11 mode at green and red wavelengths, respectively. The red-light all-fiber vortex laser is formed by a 10-cm Pr3+/Yb3+:ZBLAN fiber, a fiber Bragg grating, a fiber end-facet mirror and the MSC at 635 nm, which generates vortex beams with OAM±1 at 634.4 nm and an output power of 13 mW. The green-light all-fiber vortex laser consists of a 12-cm Ho3+:ZBLAN fiber, two fiber pigtail mirrors, and the MSC at 550 nm, which generates vortex beams with OAM±1 at 548.9 nm and an output power of 3 mW.

关键词： fiber laser vortex laser mode selective coupler visible-light

Direct generation of watt-level yellow Dy^(3+)-doped fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第4期9卷 446-451页

作者： jinhai zou Tianran Li Yanbo Dou Jin Li Nan Chen Yikun Bu Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China

Yellow lasers(∼565–590 nm)are of tremendous interest in biomedicine,astronomy,spectroscopy,and display *** far,yellow lasers still have relied heavily on nonlinear frequency conversion of near-infrared lasers,precluding compact and low-cost yellow laser ***,we address the challenge through demonstrating,for the first time,to the best of our knowledge,watt-level high-power yellow laser generation directly from a compact fiber *** yellow fiber laser simply consists of a Dy^(3+)-doped ZBLAN fiber as gain medium,a fiber end-facet mirror with high reflectivity at yellow and a 450-nm diode laser as the pump *** comprehensively investigated the dependence of the yellow laser performance on the output coupler reflectivity and the gain fiber length and demonstrated that the yellow fiber laser with an output coupler reflectivity of 4% and a gain fiber length of∼1.8 m yields a maximum efficiency of 33.6%.A maximum output power of 1.12 W at 575 nm was achieved at a pump power of 4.20 *** work demonstrated the power scaling of yellow Dy^(3+)-doped ZBLAN fiber lasers,showing their promise for applications in ophthalmology,astronomical exploration,and high-resolution spectroscopy.

关键词： fiber laser pump

Direct generation of 3.17 mJ green pulses in a cavity-dumped Ho^(3+)-doped fiber laser at 543 nm

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第3期11卷 413-419页

作者： TIANRAN LI ZIYU WANG jinhai zou JINFEN HONG QIUJUN RUAN HANG WANG ZHIPENG DONG ZHENGQIAN LUO Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen UniversityXiamen 361005China Department of Electronic Engineering Xiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518129China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

High-energy pulsed lasers in the green spectral region are of tremendous interest for applications in space laser ranging,underwater detection,precise processing,and scientific *** pulsed lasers currently are difficult to access to the so-called“green gap,”and high-energy green pulsed lasers still heavily rely on the nonlinear frequency conversion of near-IR lasers,precluding compact and low-cost green laser ***,we address this challenge by demonstrating,for the first time to the best of our knowledge,millijoule-level green pulses generated directly from a fiber *** green pulsed fiber laser consists of a 450 nm pump laser diode,a Ho^(3+)-doped ZBLAN fiber,and a cavity-dumping module based on a visible wavelength acousto-optic *** pulse operation in the cavity-dumping regime at 543 nm is observed with a tunable repetition rate in a large range of 100 Hz–3 MHz and a pulse duration of 72–116 *** maximum pulse energy of 3.17 mJ at 100 Hz is successfully achieved,which is three orders of magnitude higher than those of the rare-earth-doped fiber green lasers previously *** work provides a model for compact,high-efficiency,and high-energy visible fiber pulsed lasers.

关键词： fiber laser pump

基于V/v变压器同相牵引供电的新型补偿系统

在线全文

学校读者我要写书评

暂无评论

电力自动化设备 2018年第12期38卷 86-93页

作者：罗隆福周颖启邹津海湖南大学电气与信息工程学院湖南长沙410082 株洲变流技术国家工程研究中心湖南株洲412001

为更有效、更经济地解决传统V/v同相牵引供电系统中存在的电能质量问题,提出了一种在新拓扑结构下采用混合电能质量调节器(HPQC)的电能质量综合补偿方法。相比于传统拓扑结构下的补偿系统,新拓扑结构下的补偿系统有更加显著的节容特点... 详细信息

为更有效、更经济地解决传统V/v同相牵引供电系统中存在的电能质量问题,提出了一种在新拓扑结构下采用混合电能质量调节器(HPQC)的电能质量综合补偿方法。相比于传统拓扑结构下的补偿系统,新拓扑结构下的补偿系统有更加显著的节容特点。结合电气化铁道牵引负荷波动频繁的特性,对HPQC中无源器件(LC、L)和有源器件(变流器)的参数进行了设计。另外还分析了新型补偿系统下HPQC的控制策略,使其满足系统的补偿要求。

关键词：同相牵引供电系统补偿系统混合电能质量调节器电能质量容量分析

Latest Scientific Results of China's Lunar and Deep Space Exploration(2022–2024)

在线全文

学校读者我要写书评

暂无评论

空间科学学报 2024年第4期44卷 622-632页

作者： XU Lin LI Lei LIU Jianzhong LIN Honglei LI Yang LIU Yang XIE Lianghai ZHANG jinhai QIAO Fuhao HAN Juanjuan zou Yongliao General Office of the Lunar and Deep Space Exploration Chinese Academy of SciencesBeijng 100190 State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190 Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081 Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029

China has successfully launched six lunar probes so *** Chang'E-1 to Chang'E-4,they completed the circling,landing and roving exploration,of which Chang'E-4 was the first landing on the far side of the Moon in human ***'E-5 was launched in December 2020,bringing back 1731 g of lunar soil *** the detailed analysis of the samples,the scientists understand the history of late lunar volcanism,specifically extending lunar volcanism by about 800 million to 1 billion years,and proposed possible *** addition,there are many new understandings of space weathering such as meteorite impacts and solar wind radiation on the ***'s first Mars exploration mission Tianwen-1 was successfully launched in July *** the study of scientific data,a number of important scientific achievements have been made in the topography,water environment and shallow surface structure of *** paper introduces the main scientific achievements of Chang'E-4,Chang'E-5 and Tianwen-1 in the past two years,excluding technical and engineering *** to the large number of articles involved,this paper only introduces part of the results.

关键词： Lunar and deep space exploration of China Chang’E-4 mission Chang’E-5 mission Tianwen-1 mission

New ultrashort pulsewidth measurement technology based on interference jitter and FPGA platform

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第3期20卷 46-51页

作者： Jin Li Yanbo Dou Lixin Wang jinhai zou Yu Ding Hang Wang Qiujun Ruan Zhipeng Dong Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308China

Conventional ultrashort pulsewidth measurement technology is autocorrelation based on second-harmonic generation;however,nonlinear crystals and bulky components are required,which usually leads to the limited wavelength range and the difficult adjustment with free-space light ***,we proposed a compact all-fiber pulsewidth measurement technology based on the interference jitter(IJ)and field-programmable gate array(FPGA)platform,without requiring a nonlinear optical device(*** crystal/detector).Such a technology shows a wide measurement waveband from 1 to 2.15μm at least,a pulsewidth range from femtoseconds to 100 ps,and a small relative error of 0.15%-3.8%.In particular,a minimum pulse energy of 219 fj is experimentally detected with an average-power-peak-power product of 1.065×10^(-6)W^(2).The IJ-FPGA technology may offer a new route for miniaturized,user-friendly,and broadband pulsewidth measurement.

关键词： pulse width measurement interference jitter FPGA platform optical device

3.6 W compact all-fiber Pr3+-doped green laser at 521 nm

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2022年第5期4卷 6-14页

作者： jinhai zou Jinfen Hong Zhuang Zhao Qingyuan Li Qiujun Ruan Hang Wang Yikun Bu Xianchao Guan Min Zhou Zhiyong Feng Zhengqian Luo Xiamen University School of Electronic Science and EngineeringFujian Key Laboratory of Ultrafast Laser Technology and ApplicationsXiamenChina Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) XiamenChina Huawei Technologies Co. Ltd.ShenzhenChina Xiamen University Shenzhen Research InstituteShenzhenChina

Green semiconductor lasers are still undeveloped,so high-power green lasers have heavily relied on nonlinear frequency conversion of near-infrared lasers,precluding compact and low-cost green laser ***,we report the first Watt-level all-fiber CW Pr3t-doped laser operating directly in the green spectral region,addressing the aforementioned *** compact all-fiber laser consists of a double-clad Pr3t-doped fluoride fiber,two homemade fiber dichroic mirrors at visible wavelengths,and a 443-nm fiber-pigtailed pump *** from>10 MW∕cm2 high damage intensity of our designed fiber dielectric mirror,the green laser can stably deliver 3.62-W of continuous-wave power at∼521 nm with a slope efficiency of 20.9%.To the best of our knowledge,this is the largest output power directly from green fiber lasers,which is one order higher than previously ***,these green all-fiber laser designs are optimized by using experiments and numerical *** results are in excellent agreement with our experimental results and show that the optimal gain fiber length,output mirror reflectivity,and doping level should be considered to obtain higher power and *** work may pave a path toward compact high-power green all-fiber lasers for applications in biomedicine,laser display,underwater detection,and spectroscopy.

关键词： fiber laser high power Pr3+-doped fiber green light