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5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
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作者 陈益沙 叶云 +7 位作者 黄良金 杨欢 吴函烁 闫志平 潘志勇 王小林 王泽锋 周朴 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第4期71-76,共6页
A low-numerical-aperture(NA)concept enables large-mode-area fiber with better single-mode operation ability,which is beneficial for transverse mode instability and nonlinear effects suppression.In this contribution,we... A low-numerical-aperture(NA)concept enables large-mode-area fiber with better single-mode operation ability,which is beneficial for transverse mode instability and nonlinear effects suppression.In this contribution,we reported a high-power fiber amplifier based on a piece of self-developed large-mode-area low-NA fiber with a core NA of 0.049 and a core/inner cladding diameter of 25/400μm.The influence of the pump wavelength and fiber length on the power scaling potential of the fiber amplifier is systematically investigated.As a result,an output of 4.80 kW and a beam quality factor of~1.33 were finally obtained,which is the highest output power ever reported in a fiber amplifier exploiting the low-NA fiber.The results reveal that low-NA fibers have superiority in power scaling and beam quality maintenance at high power levels. 展开更多
关键词 high power fiber lasers ytterbium-doped fiber low-numerical-aperture fiber mode instability
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2×3 kW bidirectional output fiber oscillator employing spindle-shaped ytterbium-doped fiber
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作者 Lingfa Zeng Baolai Yang +10 位作者 Penglin Zhong Huan Yang Peng Wang Zhiping Yan Xiaoming Xi liangjin huang Hanwei Zhang Xiaolin Wang Zhiyong Pan Kai Han Zefeng Wang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第7期42-46,共5页
A 2×3 kW-level bidirectional output fiber oscillator is realized by combining the specially designed spindle-shaped ytterbium-doped fiber,non-wavelength-stabilized 976-nm LDs,and grating bandwidth optimization to... A 2×3 kW-level bidirectional output fiber oscillator is realized by combining the specially designed spindle-shaped ytterbium-doped fiber,non-wavelength-stabilized 976-nm LDs,and grating bandwidth optimization to balance transverse mode instability and stimulated Raman scattering.The maximum output powers at both ends are 3265 and 2840 W,respectively,with a total efficiency of 73.2%.The M^(2) factors of the lasers at both ends are about 1.98 and 2.38,respectively.The beam profile at both ends shows that a bidirectional output annular beam fiber oscillator has been realized,which has great potential in practical applications. 展开更多
关键词 fiber laser bidirectional output fiber oscillator spindle-shaped ytterbium-doped fiber
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Fiber laser development enabled by machine learning:review and prospect
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作者 Min Jiang Hanshuo Wu +6 位作者 Yi An Tianyue Hou Qi Chang liangjin huang Jun Li Rongtao Su Pu Zhou 《PhotoniX》 SCIE EI 2022年第1期242-268,共27页
In recent years,machine learning,especially various deep neural networks,as an emerging technique for data analysis and processing,has brought novel insights into the development of fiber lasers,in particular complex,... In recent years,machine learning,especially various deep neural networks,as an emerging technique for data analysis and processing,has brought novel insights into the development of fiber lasers,in particular complex,dynamical,or disturbance-sensitive fiber laser systems.This paper highlights recent attractive research that adopted machine learning in the fiber laser field,including design and manipulation for ondemand laser output,prediction and control of nonlinear effects,reconstruction and evaluation of laser properties,as well as robust control for lasers and laser systems.We also comment on the challenges and potential future development. 展开更多
关键词 Fiber laser Fibers Machine learning Deep learning Artificial neural networks
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Deep-learning-based phase control method for tiled aperture coherent beam combining systems 被引量:15
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作者 Tianyue Hou Yi An +8 位作者 Qi Chang Pengfei Ma Jun Li Dong Zhi liangjin huang Rongtao Su Jian Wu Yanxing Ma Pu Zhou 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2019年第4期8-14,共7页
We incorporate deep learning(DL)into tiled aperture coherent beam combining(CBC)systems for the first time,to the best of our knowledge.By using a well-trained convolutional neural network DL model,which has been cons... We incorporate deep learning(DL)into tiled aperture coherent beam combining(CBC)systems for the first time,to the best of our knowledge.By using a well-trained convolutional neural network DL model,which has been constructed at a non-focal-plane to avoid the data collision problem,the relative phase of each beamlet could be accurately estimated,and then the phase error in the CBC system could be compensated directly by a servo phase control system.The feasibility and extensibility of the phase control method have been demonstrated by simulating the coherent combining of different hexagonal arrays.This DL-based phase control method offers a new way of eliminating dynamic phase noise in tiled aperture CBC systems,and it could provide a valuable reference on alleviating the long-standing problem that the phase control bandwidth decreases as the number of array elements increases. 展开更多
关键词 coherent beam combining deep learning phase control
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Deep-learning-assisted, two-stage phase control method for high-power mode-programmable orbital angular momentum beam generation 被引量:12
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作者 TIANYUE HOU YI AN +8 位作者 QI CHANG PENGFEI MA JUN LI liangjin huang DONG ZHI JIAN WU RONGTAO SU YANXING MA PU ZHOU 《Photonics Research》 SCIE EI CSCD 2020年第5期715-722,共8页
High-power mode-programmable orbital angular momentum(OAM)beams have received substantial attention in recent years.They are widely used in optical communication,nonlinear frequency conversion,and laser processing.To ... High-power mode-programmable orbital angular momentum(OAM)beams have received substantial attention in recent years.They are widely used in optical communication,nonlinear frequency conversion,and laser processing.To overcome the power limitation of a single beam,coherent beam combining(CBC)of laser arrays is used.However,in specific CBC systems used to generate structured light with a complex wavefront,eliminating phase noise and realizing flexible phase modulation proved to be difficult challenges.In this paper,we propose and demonstrate a two-stage phase control method that can generate OAM beams with different topological charges from a CBC system.During the phase control process,the phase errors are preliminarily compensated by a deep-learning(DL)network,and further eliminated by an optimization algorithm.Moreover,by modulating the expected relative phase vector and cost function,all-electronic flexible programmable switching of the OAM mode is realized.Results indicate that the proposed method combines the characteristics of DL for undesired convergent phase avoidance and the advantages of the optimization algorithm for accuracy improvement,thereby ensuring the high mode purity of the generated OAM beams.This work could provide a valuable reference for future implementation of high-power,fast switchable structured light generation and manipulation. 展开更多
关键词 MOMENTUM ORBITAL beam
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Functional Fibers and Functional Fiber‑Based Components for High‑Power Lasers 被引量:8
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作者 Xiao Chen Tianfu Yao +4 位作者 liangjin huang Yi An Hanshuo Wu Zhiyong Pan Pu Zhou 《Advanced Fiber Materials》 SCIE EI 2023年第1期59-106,共48页
The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based components.In this contribution,we first overview the enormous poten... The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based components.In this contribution,we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems.Subsequently,the emerging functional active and passive fibers in recent years,which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission,are outlined from the perspectives of geo-metric and material engineering.Finally,novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection,and correspondingly,the high-power progress of function fiber-based components in power handling are introduced,which suggest more flexible controllability on high-power laser operations. 展开更多
关键词 High-power laser Laser fiber Passive fiber-based component Functional fiber Functional fiber-based component
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Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control 被引量:5
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作者 Hanshuo Wu Haobo Li +9 位作者 Yi An Ruixian Li Xiao Chen Hu Xiao liangjin huang Huan Yang Zhiping Yan Jinyong Leng Zhiyong Pan Pu Zhou 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2022年第6期84-93,共10页
In this work,a confined-doped fiber with the core/inner-cladding diameter of 40/250μm and a relative doping ratio of 0.75 is fabricated through a modified chemical vapor deposition method combined with the chelate ga... In this work,a confined-doped fiber with the core/inner-cladding diameter of 40/250μm and a relative doping ratio of 0.75 is fabricated through a modified chemical vapor deposition method combined with the chelate gas deposition technique,and subsequently applied in a tandem-pumped fiber amplifier for high-power operation and transverse mode instability(TMI)mitigation.Notably,the impacts of the seed laser power and mode purity are preliminarily investigated through comparative experiments.It is found that the TMI threshold could be significantly affected by the seed laser mode purity.The possible mechanism behind this phenomenon is proposed and revealed through comprehensive comparative experiments and theoretical analysis.Finally,a maximum output power of 7.49 kW is obtained with the beam quality factor of approximately 1.83,which is the highest output power ever reported in a forward tandem-pumped confined-doped fiber amplifier.This work could provide a good reference and practical solution to improve the TMI threshold and realize high-power high-brightness fiber lasers. 展开更多
关键词 confined-doped fiber fiber laser good beam quality high power transverse mode instability mitigation
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High-power fiber laser with real-time mode switchability 被引量:3
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作者 Hanshuo Wu Jiangtao Xu +2 位作者 liangjin huang Xianglong Zeng Pu Zhou 《Chinese Optics Letters》 SCIE EI CAS CSCD 2022年第2期73-79,共7页
A hundred-watt-level spatial mode switchable all-fiber laser is demonstrated based on a master oscillator power amplifier scheme.The performance of the amplifier with two seed lasers,i.e.,with the acoustically induced... A hundred-watt-level spatial mode switchable all-fiber laser is demonstrated based on a master oscillator power amplifier scheme.The performance of the amplifier with two seed lasers,i.e.,with the acoustically induced fiber grating (AIFG) mode converter inside and outside the seed laser cavity,is investigated.Real-time mode switching with millisecond scale switching time between the LP;and LP;modes while operating in full power (>100 W) is realized through an AIFG driven by radio frequency modulation.This work could provide a good reference for realizing high-power agile mode switchable fiber lasers for practical applications. 展开更多
关键词 acoustically induced fiber grating high power fiber amplifier mode switching
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Cladding-pumped Raman fiber laser with 0.78%quantum defect enabled by phosphorus-doped fiber 被引量:3
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作者 Xiaoya Ma Jiangming Xu +6 位作者 Jun Ye Yang Zhang liangjin huang Tianfu Yao Jinyong Leng Zhiyong Pan Pu Zhou 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2022年第2期1-6,共6页
The quantum defect(QD)is an important issue that demands prompt attention in high-power fiber lasers.A large QD may aggravate the thermal load in the laser,which would impact the frequency,amplitude noise and mode sta... The quantum defect(QD)is an important issue that demands prompt attention in high-power fiber lasers.A large QD may aggravate the thermal load in the laser,which would impact the frequency,amplitude noise and mode stability,and threaten the security of the high-power laser system.Here,we propose and demonstrate a cladding-pumped Raman fiber laser(RFL)with QD of less than 1%.Using the Raman gain of the boson peak in a phosphorus-doped fiber to enable the cladding pump,the QD is reduced to as low as 0.78%with a 23.7 W output power.To our knowledge,this is the lowest QD ever reported in a cladding-pumped RFL.Furthermore,the output power can be scaled to 47.7 W with a QD of 1.29%.This work not only offers a preliminary platform for the realization of high-power low-QD fiber lasers,but also proves the great potential of low-QD fiber lasers in power scaling. 展开更多
关键词 cladding pumping lowquantum defect phosphorus-doped fiber Ramanfiber laser
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Power scaling on tellurite glass Raman fibre lasers for mid-infrared applications 被引量:2
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作者 Tianfu Yao liangjin huang +3 位作者 Pu Zhou Bing Lei Jinyong Leng Jinbao Chen 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第2期74-82,共9页
The power scaling on mid-infrared Raman fibre lasers(RFLs) is in demand for applications in health, environment and security. In this paper, we present the simulated laser behaviours of the tellurite glass RFLs pumped... The power scaling on mid-infrared Raman fibre lasers(RFLs) is in demand for applications in health, environment and security. In this paper, we present the simulated laser behaviours of the tellurite glass RFLs pumped by 300-W Tm-doped fibre lasers(TDFLs) at 2 μm for the first time. By combining the advantages of the TDFLs and tellurite fibre, the output power at 2.35 μm has reached over hundreds of watts by first-order Raman shift. Moreover, the cascaded RFLs have been demonstrated with a wavelength extension greater than 3 μm and output power of tens of watts. To maximize the output power and the slope efficiency of the RFLs, we further analyse the interaction between the Raman gain and cavity loss, which are determined by fibre length and output reflectance of the laser cavity. 展开更多
关键词 mid-infrared fibre lasers Raman fibre lasers stimulated Raman scattering tellurite glass fibre
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Spectrally U-shaped profile of beam propagation factor in all-solid photonic bandgap fiber
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作者 Xiao Chen liangjin huang +6 位作者 Yi An Huan Yang Zhiping Yan Yisha Chen Xiaoming Xi Zhiyong Pan Pu Zhou 《Chinese Optics Letters》 SCIE EI CAS CSCD 2022年第1期17-22,共6页
We found the beam quality factor M^(2)of the fundamental mode as a function of wavelength is U-shaped in the working photonic bandgap(PBG) of an all-solid PBG fiber(AS-PBGF) for the first time,to the best of our knowl... We found the beam quality factor M^(2)of the fundamental mode as a function of wavelength is U-shaped in the working photonic bandgap(PBG) of an all-solid PBG fiber(AS-PBGF) for the first time,to the best of our knowledge,and our simulation results also match well with the phenomenon.The normal band that is near the high-frequency edge of the third PBG integrates the lowest M^(2)and single-mode operation simultaneously,while the other two edge regions suffer from anomalous variation of M^(2)versus wavelength.The general applicability of this finding can be further extended to other PBGs and also other representative structures in the AS-PBGF field. 展开更多
关键词 all-solid photonic bandgap fiber beam quality factor U-shaped curve photonic bandgap
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Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme
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作者 Ruixian Li Hanshuo Wu +5 位作者 Hu Xiao Zilun Chen Jinyong Leng liangjin huang Zhiyong Pan Pu Zhou 《High Power Laser Science and Engineering》 SCIE CAS 2024年第4期1-8,共8页
In this study,we investigated the influence of fiber parameters on stimulated Raman scattering(SRS)and identified a unique pattern of SRS evolution in the counter tandem pumping configuration.Our findings revealed tha... In this study,we investigated the influence of fiber parameters on stimulated Raman scattering(SRS)and identified a unique pattern of SRS evolution in the counter tandem pumping configuration.Our findings revealed that the SRS threshold in counter-pumping is predominantly determined by the length of the output delivery fiber rather than the gain fiber.By employing the counter tandem pumping scheme and optimizing the fiber parameters,a 10 kW fiber laser was achieved with beam quality M^(2)of 1.92.No mode instability or severe SRS limitation was observed.To our knowledge,this study achieved the highest beam quality in over 10 kW fiber lasers based on conventional double-clad Yb-doped fiber. 展开更多
关键词 fiber laser high beam quality high power stimulated Raman scattering tandem pumping
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