检索结果-南通市图书馆

High Power Linearly Polarized Raman Fiber Laser With Stable Temporal Output

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2019年第1期9卷 43-48页

作者： Jiaxin SONG Hanshuo WU Jun YE Jiangming XU hanwei zhang Pu ZHOU College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

We demonstrate a high power linearly polarized Raman fiber laser(RFL)pumped by an amplified spontaneous emission(ASE)***-stable operation of RFL could be ensured owing to the employment of ASE,which mitigates the inherent intensity noise compared with the classic scheme adopting laser oscillator as pump *** this experiment,the RFL has up to 119.5W output power,with central wavelength of 1129.2nm,and full width at half maximum(FWHM)linewidth of about *** polarization extinction ratio(PER)of the Raman laser is about ***,this laser has excellent long-term and short-term stabilities in terms of the output power and time domain.

关键词： Raman fiber laser amplified spontaneous emission linearly polarized

Light-emitting devices based on atomically thin MoSe_(2)

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

Journal of Semiconductors 2024年第4期45卷 19-35页

作者： Xinyu zhang Xuewen zhang hanwei Hu Vanessa Li zhang Weidong Xiao Guangchao Shi Jingyuan Qiao Nan Huang Ting Yu Jingzhi Shang Institute of Flexible Electronics Northwestern Polytechnical UniversityXi'an 710129China School of Physics and Technology Wuhan UniversityWuhan 430072China Wuhan Institute of Quantum Technology Wuhan 430206China

Atomically thin MoSe_(2) layers,as a core member of the transition metal dichalcogenides(TMDs)family,benefit from their appealing properties,including tunable band gaps,high exciton binding energies,and giant oscillator strengths,thus pro-viding an intriguing platform for optoelectronic applications of light-emitting diodes(LEDs),field-effect transistors(FETs),sin-gle-photon emitters(SPEs),and coherent light sources(CLSs).Moreover,these MoSe_(2) layers can realize strong excitonic emis-sion in the near-infrared wavelengths,which can be combined with the silicon-based integration technologies and further encourage the development of the new generation technologies of on-chip optical interconnection,quantum computing,and quantum information ***,we overview the state-of-the-art applications of light-emitting devices based on two-dimensional MoSe_(2) ***,we introduce recent developments in excitonic emission features from atomically thin MoSe_(2) and their dependences on typical physical ***,we focus on the exciton-polaritons and plasmon-exciton polaritons in MoSe_(2) coupled to the diverse forms of optical ***,we highlight the promising applications of LEDs,SPEs,and CLSs based on MoSe_(2) and their ***,we summarize the challenges and opportunities for high-quality emis-sion of MoSe_(2) and high-performance light-emitting devices.

关键词： MoSe_(2) light-matter interaction exciton polariton light-emitting device

Revealing the dynamics of intensity fluctuation transfer in a random Raman fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2022年第3期10卷 618-627页

作者： Jun Ye Xiaoya Ma Yang zhang Jiangming Xu hanwei zhang Tianfu Yao Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Temporal intensity fluctuation is one of the inherent features of fiber *** utilizing the fiber lasers to pump a random Raman fiber laser(RRFL),the intensity fluctuation transfer from the pump to the random lasing could affect the output performance *** this paper,we comprehensively compared the spectral,temporal,and power characteristics of an RRFL pumped by two different fiber lasers—a temporally unstable fiber oscillator and a temporally stable amplified spontaneous emission(ASE)*** to less impact of the intensity fluctuation transfer,the ASE source-pumped RRFL shows∼45.3%higher maximum output power,higher spectral purity(>99.9%)and optical signal-to-noise ratio(>40dB),weaker spectral broadening,and more stable temporal behavior compared to the fiber oscillator-pumped ***,based on the temporal-spatial-coupled Raman equations and the generalized nonlinear Schrödinger equations,we numerically revealed the impact of the pump intensity fluctuations on the output characteristics of RRFLs,and found that the temporal walk-off effect played an important role in the dynamics of intensity fluctuation *** work may provide a reference for designing and implementing high-performance RRFLs and promote their practicability in sensing,telecommunications,and high-power applications.

关键词： fiber pumped pump

Pump scheme optimization of an incoherently pumped high-power random fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2019年第9期7卷 977-983页

作者： JUN YE JIANGMING XU JIAXIN SONG ANG zhang hanwei zhang HU XIAO JINYONG LENG PU ZHOU College of Advanced Interdisciplinary Studies National University of Defense Technology

Optical signal-to-noise ratio(OSNR) is one of the most significant parameters for the performance characterization of random fiber lasers(RFLs) and their application potentiality in sensing and telecommunication. An effective way to improve the OSNR of RFLs is pump scheme optimization, for example, employing a temporally stable source as the pump. In this paper, the output performance of an incoherently pumped RFL dependence on the pump bandwidth has been investigated both in experiment and theory. It is found that a high-OSNR RFL can be achieved with broadband amplified spontaneous emission(ASE) source pumping, and a relatively broad pump bandwidth can also help suppress the spectral broadening while maintaining an ultra-high spectral *** optimizing the pump bandwidth to ~10 nm, maximum OSNR of ~39 dB(corresponding to a spectral purity of ~99.96%) with more than 99 W output power can be obtained. Moreover, for the pump bandwidth of 0.6–40 nm, the spectral purity can reach as high as >99% with the pump power ranging from ~85 to ~117 *** addition, with the aid of theoretical simulation based on a modified power balance model, we find that the increment of pump bandwidth can decrease the effective Raman gain coefficient, further influencing the gain characteristics, nonlinear effects, and eventually the output performance. This work provides new insight into the influence of the pump characteristics on the output performance of incoherently pumped RFLs.

关键词： Raman Pump scheme optimization of an incoherently pumped high-power random fiber laser

长波段半导体激光泵浦光纤激光器实现2 kW功率输出

在线全文

学校读者我要写书评

暂无评论

强激光与粒子束 2024年第3期36卷 82-84页

作者：王鹏孟祥明吴函烁叶云杨保来奚小明史尘张汉伟王小林习锋杰王泽锋许晓军周朴陈金宝国防科技大学前沿交叉学科学院长沙410073 国防科技大学南湖之光实验室长沙410073 国防科技大学高能激光技术湖南省重点实验室长沙410073

半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激... 详细信息

半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激光器中,由于量子亏损和泵浦吸收系数相对较高,光纤激光器的热致模式不稳定(TMI)阈值相对较低。为了提高量子效率和潜在的TMI阈值,提出采用大于1010 nm波段的LD直接泵浦光纤激光器,产生高量子效率激光。搭建了振荡放大一体化的全光纤激光器,采用总泵浦功率为2.56 kW的1010 nm波段LD泵浦,首次获得输出功率2.05 kW、光束质量M^(2)约1.7的激光。后续将通过进一步增大泵浦功率、优化光纤特性以实现更高功率、更优光束质量的光纤激光输出。

关键词：光纤激光器量子亏损振荡放大一体化模式不稳定

Investigation on random distributed feedback Raman fiber laser with linear polarized output

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2015年第2期3卷 28-31页

作者： Xueyuan Du hanwei zhang Xiaolin Wang Pu Zhou Zejin Liu College of Optoelectronic Science and Engineering National University of Defense Technology

A random distributed feedback fiber laser with linear polarized output at 1178 nm is presented. Linear polarization is realized by fiber coiling in a half-opened cavity of a polarization maintaining random fiber laser *** single linear polarization laser output power reaches ~3 W with polarization extinction ratio >14 dB. Further investigations on the coiling technique and additional feedback are also studied. So far as we know, this is the first reported linear polarized random distributed feedback Raman fiber laser.

关键词： PER

Correlation of coordinate transformation parameters

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2012年第1期3卷 34-38页

作者： Du Lan zhang hanwei Zhou Qingyong Wang Ruopu Institute of Surveying and Mapping Information Engineering University Zhengzhou 450052 China School of Surveying ＆ Land Information Engineering Henan Polytechnic University Jiaozuo 454000 China

Coordinate transformation parameters between two spatial Cartesian coordinate systems can be solved from the positions of non-colinear corresponding points. Based on the characteristics of translation, rotation and zoom components of the transformation, the complete solution is divided into three steps. Firstly, positional vectors are regulated with respect to the centroid of sets of points in order to separate the translation compo- nents. Secondly, the scale coefficient and rotation matrix are derived from the regulated positions independent- ly and correlations among transformation model parameters are analyzed. It is indicated that this method is applicable to other sets of non-position data to separate the respective attributions for transformation parameters.

关键词： coordinate transformation model Bursa model orthnormal matrix singular value decomposition (SVD) correlation

Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2017年第6期5卷 117-122页

作者： JIANGMING XU JUN YE WEI LIU JIAN WU hanwei zhang JINYONG LENG PU ZHOU College of Optoelectronic Science and Engineering National University of Defense Technology Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser

Unlike a traditional fiber laser with a defined resonant cavity, a random fiber laser(RFL), whose operation is based on distributed feedback and gain via Rayleigh scattering(RS) and stimulated Raman scattering in a long passive fiber, has fundamental scientific challenges in pulsing operation for its remarkable cavity-free feature. For the time being, stable pulsed RFL utilizing a passive method has not been reported. Here, we propose and experimentally realize the passive spatiotemporal gain-modulation-induced stable pulsing operation of counterpumped RFL. Thanks to the good temporal stability of an employed pumping amplified spontaneous emission source and the superiority of this pulse generation scheme, a stable and regular pulse train can be ***, the pump hysteresis and bistability phenomena with the generation of high-order Stokes light is presented, and the dynamics of pulsing operation is discussed after the theoretical investigation of the counterpumped RFL. This work extends our comprehension of temporal property of RFL and paves an effective novel avenue for the exploration of pulsed RFL with structural simplicity, low cost, and stable output.

关键词： RFL Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser

Optical rogue wave in random fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第1期8卷 1-7页

作者： JIANGMING XU JIAN WU JUN YE JIAXIN SONG BAICHENG YAO hanwei zhang JINYONG LENG WEILI zhang PU ZHOU YUNJIANG RAO College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Fiber Optics Research Centre Key Laboratory of Optical Fiber Sensing&Communications(Ministry of Education)University of Electronic Science&Technology of ChinaChengdu 611731China

The famous demonstration of optical rogue waves(RWs),a powerful tool to reveal the fundamental physics in different laser scenarios,opened a flourishing time for temporal *** fiber laser(RFL)has likewise attracted wide attention due to its great potential in multidisciplinary demonstrations and promising ***,owing to the distinctive cavity-free structure,it is a scientific challenge to achieve temporal localized RWs in RFLs,whose feedback arises from multiple scattering in disordered ***,we report the exploration of RW in the highly skewed,transient intensity of an incoherently pumped RFL for the first time,to our knowledge,and unfold the involved kinetics *** corresponding frequency domain measurements demonstrate that the RW event arises from a crucial sustained stimulated Brillouin scattering process with intrinsic stochastic *** investigation highlights a novel path to fully understanding the complex physics,such as photon propagation and localization,in disordered media.

关键词： fiber scattering pumped