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| 1 | Near-diffraction-limited linearly polarized narrow-linewidth random fiber laser with record kilowatt output显示文摘In this paper, we propose and experimentally investigate a linearly polarized narrow-linewidth random fiber laser(RFL) operating at 1080 nm and boost the output power to kilowatt level with near-diffraction-limited beam quality using a master oscillation power amplifier. The RFL based on a half-opened cavity, which is composed of a linearly polarized narrow-linewidth fiber Bragg grating and a 500 m piece of polarization-maintained Ge-doped fiber, generates a 0.71 W seed laser with an 88 pm full width at half-maximum(FWHM) linewidth and a 22.5 dB polarization extinction ratio(PER) for power scaling. A two-stage fiber amplifier enhances the seed laser to the maximal 1.01 k W with a PER value of 17 dB and a beam quality of M_x^2=1.15 and M_y^2=1.13. No stimulated Brillouin scattering effect is observed at the ultimate power level, and the FWHM linewidth of the amplified random laser broadens linearly as a function of the output power with a coefficient of about 0.1237 pm∕W.To the best of our knowledge, this is the first demonstration of a linearly polarized narrow-linewidth RFL with even kilowatt-level near-diffraction-limited output, and further performance scaling is ongoing. | JIANGMING XU LONG HUANG MAN JIANG JUN YE PENGFEI MA JINYONG LENG JIAN WU HANWEI ZHANG PU ZHOU | 2017 | Photonics Research2017，5，4： | 20 |
| 2 | Phosphorus limitation on photosynthesis of two dominant understory species in a lowland tropical forest显示文摘Aims Elevated nitrogen(N)deposition in tropical regions may accelerate ecosystem phosphorus(P)limitation.However,it is not explicitly addressed that how changes in soil N and P availability affect foliar nutrients and photosynthesis of plants in tropical forests.In this study,we examined the effects of N and P additions on foliar nutrients and net photosynthesis of two dominant understory species,Randia can-thioides(R.canthioides)and Cryptocarya concinna(C.concinna)in an N-saturated old-growth tropical forest(>400-year-old)in south-ern China.Methods A full factorial NP addition experiment(2×2)was established in 2007 and continued through August 2010.Four treatments,including control,N addition(150 kg N ha^(−1) year^(−1)),P addi-tion(150 kg P ha^(−1) year^(−1))and NP addition(150 kg N ha^(−1) year^(−1) plus 150 kg P ha^(−1) year^(−1))were set up in this experiment.Photosynthetic traits maximum photosynthetic CO_(2) assimilation(Amax),stomatal conductance(gs),leaf transpiration(E),light satu-rating point,concentrations of chlorophyll a/b and foliar nutri-ents(N and P)of the two species were measured with standard methods.Important Findings Three years of N addition had no significant effects on any measured photosynthetic parameter of either species.However,N addition significantly elevated foliar N and P concentrations of one species(R.canthioides),resulting in lower photosynthetic nitrogen use effi-ciency(PNUE).N treatments decreased foliar P concentration of the other(C.concinna),resulting in increased photosynthetic phos-phorus use efficiency,which was potentially related to N-induced P shortage.In contrast,positive effects of P treatments on gs of R.can-thioides,Amax and chlorophyll a+b of C.concinna were observed.P treatments also elevated foliar P and PNUE of both species,imply-ing P induced more efficient use of N.Our results suggested a more important role of P than N on influencing photosynthetic traits of these two understory species.Alleviation of P shortage through P addition may enhance photosynthetic performances of some under-story species in N-rich tropical forests. | Feifei Zhu Xiankai Lu Jiangming Mo | 2014 | Journal of Plant Ecology2014，7，6： | 10 |
| 3 | Tandem pumping architecture enabled high power random fiberlaser with near-diffraction-limited beam quality显示文摘In this contribution, we present the tandem pumping avenue leveraged performance scaling of random fiber laser to record 3 kW level with inherent temporal stability and near-diffraction-limited beam quality. The high power system employs a four-stage master oscillator power amplifier chain. The master oscillator is a half-opened cavity structured random distributed feedback fiber laser centered at 1080 nm and pumped by incoherent amplified spontaneous emission source. Narrowband random laser seed is selected by employing a spectral filtering module with a maximum output power of 1.08 W, full width at half maximum linewidth of 0.47 nm and spectral optical-signal-to-noise ratio of about 42 dB. As to the main amplification stage, for given 104 W pre-amplified random laser seed and 3.61 kW pump laser, an ultimate output power of 3.03 kW can be obtained,corresponding to an optical-to-optical conversion efficiency of 81.05%. Nearly single-transverse-mode amplified random laser can be achieved even at full power level for inherent high thermal modal instability threshold enabled by tandem pumping and inducing bending loss for high-order transverse-mode. Further performance scaling of this high power random laser system, such as power boosting, operation wavelength tuning and linewidth alteration, is the next goal. | XU JiangMing YE Jun ZHOU Pu LENG JinYong XIAO Hu ZHANG HangWei WU Jian CHEN JinBao | 2019 | Science China(Technological Sciences)2019，62，1： | 8 |
| 4 | High power linearly polarized fiber laser:Generation, manipulation and application显示文摘Linearly-polarized(LP) fiber lasers, which could find wide potential applications such as coherent detection, coherent/spectral beam combining, nonlinear frequency conversion, have been a research focus in recent years. In this paper, we will present a general review on the achievements of various kinds of high power LP fiber laser and its applications for the first time. The recent progress in high power LP fiber oscillator, including fiber oscillator based on active fiber, Raman fiber laser and Random distributed feedback fiber laser are summarized. Power scaling of LP fiber laser by using active-fiber based power amplifier, passive-fiber based Raman amplifier, and active/passive fiber based hybrid fiber amplifier has been achieved. Polarization-maintained active fiber based power amplifier and non-polarization-maintained active fiber based power amplifier incorporating active polarization control are specially introduced in detail. High power LP fiber laser with diversified property, such as narrow-linewidth, wavelength-tunable and ultrashort pulse operation, are summarized. Various kinds application of high power LP fiber laser, including beam combining,supercontinumm generation, mid-infrared lasing, structured light field and ultrasonic generation, are presented at the end of this paper. | ZHOU Pu HUANG Long XU JiangMing MA PengFei SU RongTao WU Jian LIU ZeJin | 2017 | Science China(Technological Sciences)2017，60，12： | 8 |
| 5 | kW-level,narrow-linewidth linearly polarized fiber laser with excellent beam quality through compact one-stage amplification scheme显示文摘In this manuscript, we demonstrate high-power, narrow-linewidth linearly polarized fiber laser with excellent beam quality through compact one-stage amplification scheme. By employing a single-mode–multimode–single-mode structure seed laser, a linearly polarized Yb-doped fiber laser with narrow linewidth and high output power is achieved.This laser, when used as a master oscillator, can be capable of suppressing the ASE in the process of power amplification.Thus, only one-stage amplification structure is used to scale up the laser power, and linearly polarized output with a polarization extinction ration of 14 d B, a narrow linewidth of 0.3 nm and an output power of 1018 W are achieved.Moreover, due to the good beam quality of seed laser and the well-designed amplifier stage, the beam quality of the output laser is near-diffraction-limited with M_x^2 ~1.18 and M_y^2 ~ 1.24 at the maximum power, and without mode instability occurring. | Man Jiang Pengfei Ma Long Huang Jiangming Xu Pu Zhou Xijia Gu | 2017 | High Power Laser Science and Engineering2017，5，4： | 7 |
| 6 | Relativistic description of second-order correction to nuclear magnetic moments with point-coupling residual interaction显示文摘Using the single particle states and the residual interaction derived from the relativistic point-coupling model with the PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments of LS closed shell nuclei ±1 nucleon with A = 15,17,39 and 41 are studied and compared with previous non-relativistic results.It is found that the second-order corrections are significant.With these corrections,the isovector magnetic moments of the concerned nuclei are well reproduced,especially those for A = 17 and A = 41. | LI Jian MENG Jie RING Peter YAO JiangMing ARIMA Akito | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，2： | 7 |
| 7 | Valve Dynamic and Thermal Cycle Model in Stepless Capacity Regulation for Reciprocating Compressor显示文摘The existing researches of stepless capacity regulation system by depressing the suction valve for reciprocation compressor always adopt hypothesis that the compressor valves are open or close instantaneously, the valve dynamic has not been taken account into thermal cycle computation, the influence of capacity regulation system on suction valves dynamic performance and cylinder thermal cycle operation has not been considered. This paper focuses on theoretical and experimental analysis of the valve dynamic and thermal cycle for reciprocating compressor in the situation of stepless capacity regulation. The valve dynamics equation, gas forces for normal and back flow, and the cylinder pressure varying with suction valve unloader moment during compression thermal cycle are discussed. A new valve dynamic model based on L-K real gas state equation for reciprocating compressor is first deduced to reduce the calculation errors induced by the ideal gas state equation. The variations of valve dynamic and cylinder pressure during part of compression stroke are calculated numerically. The calculation results reveal the non-normal thermal cycle and operation condition of compressor in stepless capacity regulation situation. The numerical simulation results of the valve dynamic and thermal cycle parameters are also verified by the stepless capacity regulation experiments in the type of 3L-10/8 reciprocating compressor. The experimental results agree with the numerical simulation results, which show that the theoretical models proposed are effective and high-precision. The proposed theoretical models build the theoretical foundation to design the real stepless capacity regulation system. | JIN Jiangming HONG Weirong | 2012 | Chinese Journal of Mechanical Engineering2012，25，6： | 7 |
| 8 | g factors of nuclear low-lying states:A covariant description显示文摘The g factors and spectroscopic quadrupole moments of low-lying excited states 2+1,…,81+ in 24Mg are studied in a covariant density functional theory.The wave functions are constructed by configuration mixing of axially deformed mean-field states projected on good angular momentum.The mean-field states are obtained from the constraint relativistic point-coupling model plus BCS calculations using the PC-F1 parametrization for the particle-hole channel and a density-independent delta-force for the particle-particle channel.The available experimental g factor and spectroscopic quadrupole moment of 21+ state are reproduced quite well.The angular momentum dependence of g factors and spectroscopic quadrupole moments,as well as the effects of pairing correlations are investigated. | YAO JiangMing PENG Jing MENG Jie RING Peter | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，2： | 5 |
| 9 | In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality显示文摘High power superfluorescent fiber sources(SFSs), which could find wide applications in many fields such as middle infrared laser generation, Raman fiber laser pumping and spectral beam combination, have experienced a flourishing time in recent years for its unique properties, such as short coherence length and high temporal stability. The challenge for performance scalability of powerful SFS mainly lies on the physical issues including parasitic laser oscillation and modal instability(MI). In this contribution, by employing in-band pumping avenue and high-order transverse-mode management, we explore a high power SFS with record power, near-diffraction-limited beam quality and spectral manipulation flexibility. An ultimate output power of 3.14 kW can be obtained with high temporal stability and a beam quality of M^2= 1.59 for the amplified light. Furthermore, the dynamics of spectral evolutions, including redshifting of central wavelength and unsymmetrical broadening in spectral wings, of the main amplifier with different seed linewidths are investigated contrastively. Benefiting from the unique high pump brightness and high MI threshold of in-band pumping scheme, the demonstrated system also manifests promising performance scaling potential. | Jiangming Xu Jun Ye Hu Xiao Jinyong Leng Wei Liu Pu Zhou | 2018 | High Power Laser Science and Engineering2018，6，3： | 5 |
| 10 | Development and ultrastructure of larval skin in Scophthamus maximus显示文摘The histological development and ultrastructure of larval turbot skin were studied by both light and transmission electron microscopes.The early larvae showed a complete bisymmetry of skin.The skin of 1-25days old larvae developed slowly and was composed of the thin epidermis of 1-2layers epidermal cells and undeveloped dermis before the metamorphosis.But the skin developed significantly when the.metamorphosis began.Till the completion of metamorphosis(about 60days old),the skin contained 3-4layers epidermal cells and very developed collagenous strata.Wisth the process of metamorphosis,the ocular side skin and blind side skin became different in ultrastructure.Ultrastructural observation showed the epidermis of turbot contained three types of epidermal cells;filament-containing cells,mucus cells and chloride cells.The ocular side epidermis with looser structure consisted one type of filament-containing cells,but the blind side epidermis was structured densely and two types of filament-containing cells were observed in it.Melanophores,iridophores,fibroblasts and other cell types and tisssues were found in the spongiosum of dermis.The distribution of melanophores depended on the larval developing stage and the pigmentation of skin.The differentiation of skin seems to be an adaptation for the change of life style of turbot larvae from pelagic living to benthonic living after the metamorphosis. | ZHUJie ZHANGXiu-mei GAOTian-xiang JIANGMing | 2003 | 水产学报2003，27，2： | 5 |
| 11 | Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser显示文摘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 obtained.Furthermore, 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. | JIANGMING XU JUN YE WEI LIU JIAN WU HANWEI ZHANG JINYONG LENG PU ZHOU | 2017 | Photonics Research2017，5，6： | 4 |
| 12 | Point cloud registration for agriculture and forestry crops based on calibration balls using Kinect V2显示文摘For the process of point cloud registration,and the problem of inaccurate registration due to errors in correspondence between keypoints.In this paper,a registration method based on calibration balls was proposed,the trunk,branch,and crown were selected as experimental objects,and three calibration balls were randomly placed around the experimental objects to ensure different distances between two ball centers.Using the Kinect V2 depth camera to collect the point cloud of the experimental scene from four different viewpoints,the PassThrough filter algorithm was used for point cloud filtering in each view of the experimental scenes.The Euclidean cluster extraction algorithm was employed for point cloud clustering and segmentation to extract the experimental object and the calibration ball.The random sample consensus(RANSAC)algorithm was applied to fit the point cloud of a ball and calculate the coordinates of the ball center so that the distance between two ball centers under different viewpoints can be obtained by using the coordinates of the ball center.Comparing the distance between the ball centers from different viewpoints to determine the corresponding relationship between the ball centers from different viewpoints,and then using the singular value decomposition(SVD)method,the initial registration matrix was obtained.Finally,Iterative Closest Point(ICP)and its improved algorithm were used for accurate registration.The experimental results showed that the method of point cloud registration based on calibration balls can solve the problem of corresponding error of keypoints,and can register point clouds from different viewpoints of the same object.The registration method was evaluated by using the registration running time and the fitness score.The final registration running time of different experimental objects was not more than 6.5 s.The minimum fitness score of the trunk was approximately 0.0001,the minimum fitness score of the branch was approximately 0.0001,and the minimum fitness score of the crown was approximately 0.0006. | Sanzhang Zhou Feng Kang Wenbin Li Jiangming Kan Yongjun Zheng | 2020 | International Journal of Agricultural and Biological Engineering2020，13，1： | 4 |
| 13 | Vortex random fiber laser with controllable orbital angular momentum mode显示文摘In this paper, we propose and experimentally demonstrate a vortex random fiber laser(RFL) with a controllable orbital angular momentum(OAM) mode. The topological charge of the vortex RFL can range from-50 to 50 with nearly watt-level output power. A triangular toroidal interferometer is constructed to verify the spiral phase structure of the generated vortex random laser with a special coherence property. Vortex RFLs with fractional topological charge are also performed in this work. As the first demonstration of a vortex RFL with a controllable OAM mode(to the best of our knowledge), this work may not only offer a valuable reference on temporal modulation of a vortex beam and optical field control of an RFL but also provide a potential vortex laser source for applications in imaging, sensing, and communication. | XIAOYA MA JUN YE YANG ZHANG JIANGMING XU JIAN WU TIANFU YAO JINYONG LENG PU ZHOU | 2021 | Photonics Research2021，9，2： | 4 |
| 14 | Pump scheme optimization of an incoherently pumped high-power random fiber laser显示文摘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 purity.By 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 W.In 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. | JUN YE JIANGMING XU JIAXIN SONG ANG ZHANG HANWEI ZHANG HU XIAO JINYONG LENG PU ZHOU | 2019 | Photonics Research2019，7，9： | 4 |
| 15 | Optical rogue wave in random fiber laser显示文摘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 statistics.Random fiber laser(RFL)has likewise attracted wide attention due to its great potential in multidisciplinary demonstrations and promising applications.However,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 medium.Here,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 successfully.The corresponding frequency domain measurements demonstrate that the RW event arises from a crucial sustained stimulated Brillouin scattering process with intrinsic stochastic nature.This investigation highlights a novel path to fully understanding the complex physics,such as photon propagation and localization,in disordered media. | JIANGMING XU JIAN WU JUN YE JIAXIN SONG BAICHENG YAO HANWEI ZHANG JINYONG LENG WEILI ZHANG PU ZHOU YUNJIANG RAO | 2020 | Photonics Research2020，8，1： | 4 |
| 16 | High Power Linearly Polarized Raman Fiber Laser With Stable Temporal Output显示文摘We demonstrate a high power linearly polarized Raman fiber laser(RFL)pumped by an amplified spontaneous emission(ASE)source.Temporal-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 source.In 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 4.18nm.The polarization extinction ratio(PER)of the Raman laser is about 23dB.Moreover,this laser has excellent long-term and short-term stabilities in terms of the output power and time domain. | Jiaxin SONG Hanshuo WU Jun YE Jiangming XU Hanwei ZHANG Pu ZHOU | 2019 | Photonic Sensors2019，9，1： | 4 |
| 17 | Nitrogen deposition and its ecological impact in China: An overview显示文摘 | Xuejun Liu Lei Duan Jiangming Mo Enzai Du Jianlin Shen Xiankai Lu Ying Zhang Xiaobing Zhou Chune He Fusuo Zhang | 2010 | Environmental Pollution2010，，10： | 4 |
| 18 | Virtual Speed Sensorless Desired Control Strategy of Maglev Single-sided Linear Induction Motors显示文摘单边短初级长次级直线感应电机己普遍应用于低速磁悬浮的驱动系统。由于在动态纵向边端效应影响下等效电路不对称,单边直线感应电机(single-sided linear inductionmotor,SLIM)的一些参数非线性变化。传统的应用于旋转电机的无速度传感器方法不再适用。首先分析了SLIM的M/T轴等效电路,选择次级磁链作为速度观测器状态变量。根据李雅普诺夫系统稳定性判据,推导出适用于SLIM的无速度传感器辨识;然后,采用反馈广义积分观测器控制稳态辨识速度的双幅脉振幅值;引入虚拟期望变量(virtualdesiredvariable,VDV)法,利用估算速度参与SLIM的恒滑差频率矢量控制。仿真与实验对所提控制算法的有效性和实用性进行了验证,所得结论可为磁悬浮的无速度传感器控制提供参考。 | DENG Jiangming CHEN Tefang TANG Jianxiang ZHANG Guixin YU Mingyang | 2012 | 中国电机工程学报2012，32，27： | 3 |
| 19 | Powerful Narrow Linewidth Random Fiber Laser显示文摘在这篇论文,我们表明狭窄的线宽随机纤维激光,它采用悦耳的泵激光为效率优化,一个狭窄乐队的纤维布拉格栅栏( FBG )和构造一个一半开的洞的单个模式纤维的节选择操作波长,并且分开泵光输入和随机的放射激光输出的一个传播者。光谱线宽在下面到 42.31, GHz 通过由 FBG 过滤被完成。8.97 W 泵光什么时候在优化波长集中了 1036.5 nm 被发射进一半开的洞,与 2.15 W 的最大的产量力量放射激光的 1081.4 nm 随机被完成,它比以前的报导结果更强大。 | Jun YE Jiangming XU Hanwei ZHANG Pu ZHOU | 2017 | Photonic Sensors2017，7，1： | 3 |
| 20 | A cubic triboelectric generator as a self-powered orientation sensor显示文摘Recently, triboelectric generator(TEG) has attracted a lot of attention due to its high output voltage and low-cost fabrication process. Here, a novel cubic TEG box is designed, which has separated electrodes on different surfaces. Thanks to the specially designed structure, it can scavenge vibration energy from all directions. Firstly the device is investigated through finite element method(FEM) simulation. Then the device is evaluated by experiments. The measuremental results show that this device can generate an amount of 25 n C charge during once shake by charging a 10 n F capacitor. Besides, an output voltage about 100 V is obtained, which is able to directly light up several light-emitting diodes(LEDs) simultaneously. At last, the device is utilized as a self-powered orientation sensor, which shows explicit directivity. This work extends the applications of TEG for ambient vibration energy harvesting techniques and the self-powered orientation sensor. | QIU GuoLin LIU Wen HAN MengDi CHENG XiaoLiang MENG Bo SMITHA Ankanahalli Shankaregowda ZHAO JiangMing ZHANG HaiXia | 2015 | Science China(Technological Sciences)2015，58，5： | 2 |
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