检索结果-南通市图书馆

Transient breathing dynamics during extinction of dissipative solitons in mode‑locked fiber lasers

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2024年第1期17卷 9-19页

作者： Zichuan Yuan Si Luo Ke Dai Xiankun Yao Chenning Tao Qiang Ling Yusheng Zhang Zuguang Guan Daru Chen Yudong Cui Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Optical Information Detection and Display Technology of Zhejiang Zhejiang Normal UniversityJinhua 321004China School of Physics Northwest UniversityXi’an 710127China

The utilization of the dispersive Fourier transformation approach has enabled comprehensive observation of the birth process of dissipative solitons in fiber lasers.However,there is still a dearth of deep understanding regarding the extinction process of dissipative solitons.In this study,we have utilized a combination of experimental and numerical techniques to thoroughly examine the breathing dynamics of dissipative solitons during the extinction process in an Er-doped mode-locked fiber laser.The results demonstrate that the transient breathing dynamics have a substantial impact on the extinction stage of both steady-state and breathing-state dissipative solitons.The duration of transient breathing exhibits a high degree of sensitivity to variations in pump power.Numerical simulations are utilized to produce analogous breathing dynamics within the framework of a model that integrates equations characterizing the population inversion in a mode-locked laser.These results corroborate the role of Q-switching instability in the onset of breathing oscillations.Furthermore,these findings offer new possibilities for the advancement of various operational frameworks for ultrafast lasers.

关键词： Breathing soliton fiber laser Dispersive Fourier transform Q-switched instability

Pump quantum efficiency optimization of 3.5 μm Er-doped ZBLAN fiber laser for high-power operation

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

Frontiers of Optoelectronics 2023年第4期16卷 13-23页

作者： Lu Zhang Shijie Fu Quan Sheng Xuewen Luo Junxiang Zhang Wei Shi Jianquan Yao Institute of laser and Optoelectronics School of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Opto-Electronic Information Technology Ministry of EducationTianjin UniversityTianjin 300072China

976 nm+1976 nm dual-wavelength pumped Er-doped ZBLAN fiber lasers are generally accepted as the preferred solution for achieving 3.5μm lasing.However,the 2μm band excited state absorption from the upper lasing level(^(4 )F_(9/2)→^(4)F_(7/2))depletes the Er ions population inversion,reducing the pump quantum efciency and limiting the power scaling.In this work,we demonstrate that the pump quantum efciency can be efectively improved by using a long-wavelength pump with lower excited state absorption rate.A 3.5μm Er-doped ZBLAN fber laser was built and its performances at diferent pump wavelengths were experimentally investigated in detail.A maximum output power at 3.46μm of~7.2 W with slope efciency(with respect to absorbed 1990 nm pump power)of 41.2%was obtained with an optimized pump wavelength of 1990 nm,and the pump quantum efciency was increased to 0.957 compared with the 0.819 for the conventional 1976 nm pumping scheme.Further power scaling was only limited by the available 1990 nm pump power.A numerical simulation was implemented to evaluate the cross section of excited state absorption via a theoretical ftting of experimental results.The potential of further power scaling was also discussed,based on the developed model.

关键词： fiber laser Mid-infrared Er-doped ZBLAN fiber Dual-wavelength pumping

High-energy and high-peak-power GHz burst-mode all-fiber laser with a uniform envelope and tunable intra-burst pulses

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

High Power laser Science and Engineering 2023年第6期11卷 146-153页

作者： Shuailin Liu Bin Zhang Yuanzhuang Bu Desheng Zhao Xiran Zhu Linyong Yang Jing Hou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Nanhu laser Laboratory National University of Defense TechnologyChangshaChina Hunan Provincial Key Laboratory of High Energy laser Technology ChangshaChina

We report a Yb-doped all-fiber laser system generating burst-mode pulses with high energy and high peak power at a GHz intra-burst repetition rate.To acquire the uniform burst envelope,a double-pre-compensation structure with an arbitrary waveform laser diode driver and an acoustic optical modulator is utilized for the first time.The synchronous pumping is utilized for the system to reduce the burst repetition rate to 100 Hz and suppress the amplified spontaneous emission effect.By adjusting the gain of every stage,uniform envelopes with different output energies can be easily obtained.The intra-burst repetition rate can be tuned from 0.5 to 10 GHz actively modulated by an electro-optic modulator.Optimized by timing control of eight channels of analog signal and amplified by seven stages of Yb-doped fiber amplifier,the pulse energy achieves 13.3 mJ at 0.5 ns intra-burst pulse duration,and the maximum peak power reaches approximately3.6 MW at 48 ps intra-burst pulse duration.To the best of our knowledge,for reported burst-mode all-fiber lasers,this is a record for output energy and peak power with nanosecond-level burst duration,and the widest tuning range of the intra-burst repetition rate.In particular,this flexibly tunable burst-mode laser system can be directly applied to generate high-power frequency-tunable microwaves.

关键词： burst-mode laser fiber laser high peak power high pulse energy

Niobium telluride absorber for a mode-locked vector soliton fiber laser

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 130-138页

作者： XinXin Shang NanNan Xu Jia Guo Shuo Sun HuaNian Zhang SWageh Ahmed AAl-Ghamdi Han Zhang DengWang Li Shandong Province Key Laboratory of Medical Physics and Image Processing Technology Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China Institute of Microscale Optoelectronics Collaborative Innovation Center for Optoelectronic Science&TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Niobium telluride(NbTe_(2)),an emerging transition metal dichalcogenide material,has been theoretically predicted to have nonlinear absorption properties and excellent optical response.However,only a few studies of the utilization of NbTe_(2)in ultrafast photonics have been reported.In this work,a NbTe_(2)-based saturable absorber(SA)was applied in an erbium-doped fiber as a mode-locked device,and a vector soliton based on NbTe_(2)was obtained for the first time.NbTe_(2)-PVA film SA was successfully prepared by the liquid-phase exfoliation and spin coating methods,with a modulation depth of up to 10.87%.The nonlinear absorption coefficient of NbTe_(2)-based SA film tested through the open-aperture Z-scan laser measurement is 0.62×10^(−11) m/W.A conventional soliton with a pulse duration of 858 fs was generated using NbTe_(2)-based SA,which was demonstrated to be a kind of polarization-locked vector soliton in further investigation.Our experimental results reveal the nonlinear optical properties of NbTe_(2)and broaden its applications in ultrafast photonic devices.

关键词： niobium telluride saturable absorber mode-locked pulse fiber laser

High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第4期22卷 66-70页

作者：王涛任帅常洪祥任博郭琨李灿马鹏飞冷进勇周朴 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China School of Information and Communications National University of Defense TechnologyWuhan 430035China Nanhu laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy laser Technology National University of Defense TechnologyChangsha 410073China

High-power ultrafast laser amplification based on a non-polarization maintaining fiber chirped pulse amplifier is demonstrated.The active polarization control technology based on the root-mean-square propagation(RMS-prop)algorithm is employed to guarantee a linearly polarized output from the system.A maximum output power of 402.3 W at a repetition rate of 80 MHz is realized with a polarization extinction ratio(PER)of>11.4 dB.In addition,the reliable operation of the system is verified by examining the stability and noise properties of the amplified laser.The M2factor of the laser beam at the highest output power is measured to be less than 1.15,indicating a diffraction-limited beam quality.Finally,the amplified laser pulse is temporally compressed to 755 fs with a highest average power of 273.8 W.This is the first time,to the best of our knowledge,that the active polarization control technology was introduced into the high-power ultrafast fiber amplifier.

关键词： active polarization control root-mean-square propagation algorithm linearly polarized laser chirped pulse amplification femtosecond laser fiber laser

Theoretical and experimental analysis of second order Bragg resonance of 45° TFG and its fiber laser application

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第1期20卷 122-126页

作者：宋青果叶柏林肖翔鹏黄成俊牟成博闫志君张琳 School of Optical and Electronic Information NGIAHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Techwinsemi Optoelectronic Co. Ltd.Shenzhen 518000China Key Laboratory of Specialty fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data ScienceJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK

We report the observation of second order Bragg resonance(2 nd-OBG) produced by tilted fiber gratings(TFGs) fabricated using phase mask UV inscription.The theoretical analysis has revealed that the generation of high order Bragg resonance of gratings is induced by a square-shape refractive index profile,which is caused by over-saturated UV exposure.In the experiment,we have studied the TFGs with different tilt angles under over-saturated UV exposure,in which all gratings have showed the 2 nd-OBR,and the larger tilt angle of the grating has the stronger 2 nd-OBR.When the tilt angle of the grating is-45°,the Bragg resonance exhibits very strong polarization dependence,because the 2 nd-OBR wavelength is located within the polarizing bandwidth of 45° TFG.Finally,we have demonstrated an erbium-doped fiber laser with> 99.9% degree of polarization,and,by applying mechanical stretching on the grating,a wavelength tunable laser output has been achieved.The output laser shows ~0.2 dB amplitude variation within 1 h continuous monitoring of the laser.

关键词： tilted fiber grating fiber laser

High-power broadband supercontinuum generation through a simple narrow-bandwidth FBGs-based fiber laser cavity

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第1期20卷 85-88页

作者：张嵩姜曼李灿粟荣涛周朴姜宗福 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

The generation of supercontinuum(SC) often requires ultrashort pulsed lasers with high peak power and gain media with large nonlinear coefficients,such as a long piece of fiber or photonic crystal fiber.In this Letter,we propose and demonstrate that high-power SC can be generated through a simple narrow-bandwidth fiber Bragg gratings(FBGs)-based laser cavity without any modulation,based on the mechanism of intense nonlinear effects induced by the inherent self-pulsation generated inside the cavity.In the experiment,an ~80 W SC laser with the spectrum range from fiber laser cavity.This work enriches the research content of SC and provides a cost-effective method for high-power SC lasers.

关键词： supercontinuum fiber laser narrow-linewidth laser

Modeling and analysis of actively Q-switched Fe:ZnSe laser pumped by a 2.8μm fiber laser

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2023年第9期19卷 513-518页

作者： LIANG Xiaolin ZHOU Songqing LIU Zhizhuang BAO Bengang College of Intelligent Manufacturing Hunan University of Science and EngineeringYongzhou 425199China

A theoretical model concerning active Q-switching of an Fe:ZnSe laser pumped by a continuous-wave(CW)2.8μm fiber laser is developed.Calculations are compared with the recently reported experiment results,and good agreement is achieved.Effects of principal parameters,including pump power,output reflectivity,ion concentration and temperature of crystal,on the laser output performance are investigated and analyzed.Numerical results demonstrate that similar to highly efficient CWFe:ZnSe laser,low temperature of the crystal is significant to obtain high peak power Q-switched pulses.The numerical simulation results are useful for optimizing the design of actively Q-switched Fe:ZnSe laser.

关键词： Modeling and analysis of actively Q-switched Fe:ZnSe laser pumped by a 2.8μm fiber laser

Linearly Polarized Polarization-Maintaining Er^(3+)-Doped Fluoride fiber laser in the Mid-Infrared

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2022年第1期20卷 1-8页

作者： Hong-Yu Luo Yong-Zhi Wang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054

We demonstrated the~2.8-μm and~3.5-μm linearly polarized continuous wave(CW)laser outputs from a polarization-maintaining(PM)Er^(3+)-doped fluoride fiber laser.By introducing a film polarizer into the cavity to select the laser polarization orientation,the~2.8-μm linearly polarized CW laser with a high polarization extinction ratio(PER)of~23 dB and maximum output power of 2.37 W was achieved under double-end pumping at 976 nm.By adding another 1981-nm pump source simultaneously,the~3.5-μm linearly polarized CW laser was also obtained,giving higher PER of~27 dB and maximum output power of 307 mW which is only limited by the available power of 1981-nm pump.To the best of our knowledge,this is the first report on a mid-infrared linearly polarized CW PM fiber laser in the>2.5-μm mid-infrared region.This work not only opens up opportunities for some new mid-infrared applications,but also provides a promising platform for developing high-stability and versatile mid-infrared laser sources.

关键词： fiber laser linearly polarized mid-infrared polarization-maintaining(PM)