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| 1 | Ultrabroadband,few-cycle pulses directly from a Mamyshev fiber oscillator显示文摘While the performance of mode-locked fiber lasers has been improved significantly,the limited gain bandwidth restricts them from generating ultrashort pulses approaching a few cycles or even shorter.Here we present a novel method to achieve few-cycle pulses(~5 cycles)with an ultrabroad spectrum(~400 nm at-20 dB)from a Mamyshev oscillator configuration by inserting a highly nonlinear photonic crystal fiber and a dispersion delay line into the cavity.A dramatic intracavity spectral broadening can be stabilized by the unique nonlinear processes of a self-similar evolution as a nonlinear attractor in the gain fiber and a'perfect'saturable absorber action of the Mamyshev oscillator.To the best of our knowledge,this is the shortest pulse width and broadest spectrum directly generated from a fiber laser. | CHUNYANG MA ANKITA KHANOLKAR YIMIN ZANG ANDY CHONG | 2020 | Photonics Research2020，8，1： | 6 |
| 2 | 携带时变轨道角动量的超快时空波包的产生显示文摘具有涡旋相位的光束可携带光子轨道角动量.涡旋相位旋转一周通常是2π的整数倍,这个整数被称为拓扑荷.其携带的光子轨道角动量为约化普朗克常数和拓扑荷的乘积.大多数涡旋光束的轨道角动量不随时间而改变.最近,西班牙萨拉曼卡大学Rego等人实现了一种携带随时间快速变化光子纵向轨道角动量的光束,称为'自转矩光束'.角动量的时变特性在光与物质的超快作用中具有重要的作用.本文实验产生了携带随时间快速变化光子横向轨道角动量的超快时空波包.该时空波包具有两个拓扑荷分别为+1和-1的时空涡旋,分别对应+1和-1的光子横向轨道角动量,这两个时空涡旋的时间间隔在0.5~1 ps间精确可控.后续研究可望实现更短的时间间距、更多的时空涡旋数目以及更高的拓扑荷.这类携带时变轨道角动量的时空波包在超快光开关以及光子轨道角动量与微纳米结构的超快作用中具有重要的潜在应用价值. | 万辰皓 陈建 Andy Chong 詹其文 | 2020 | Science Bulletin2020，65，16： | 6 |
| 3 | Photonic orbital angular momentum with controllable orientation显示文摘Vortices are whirling disturbances,commonly found in nature,ranging from tremendously small scales in Bose-Einstein condensations to cosmologically colossal scales in spiral galaxies.An optical vortex,generally associated with a spiral phase,can carry orbital angular momentum(OAM).The optical OAM can either be in the longitudinal direction if the spiral phase twists in the spatial domain or in the transverse direction if the phase rotates in the spatiotemporal domain.In this article,we demonstrate the intersection of spatiotemporal vortices and spatial vortices in a wave packet.As a result of this intersection,the wave packet hosts a tilted OAM that provides an additional degree of freedom to the applications that harness the OAM of photons. | Chenhao Wan Jian Chen Andy Chong Qiwen Zhan | 2022 | National Science Review2022，9，7： | 2 |
| 4 | Sculpturing spatiotemporal wavepackets with chirped pulses显示文摘Pulse shaping has become a powerful tool in generating complicated ultrafast optical waveforms to meet specific application needs.Traditionally,pulse shaping focuses on the temporal waveform synthesis.Recent interests in structuring light in the spatiotemporal domain rely on Fourier analysis.A space-to-time mapping technique allows us to directly imprint complex spatiotemporal modulation through taking advantage of the relationship between frequency and time of chirped pulses.The concept is experimentally verified through the generation of spatiotemporal optical vortex(STOV)and STOV lattice.The power of this method is further demonstrated by STOV polarity reversal,vortex collision,and vortex annihilation.Such a direct mapping technique opens tremendous potential opportunities for sculpturing complex spatiotemporal waveforms. | QIAN CAO JIAN CHEN KEYIN LU CHENHAO WAN ANDY CHONG QIWEN ZHAN | 2021 | Photonics Research2021，9，11： | 2 |
| 5 | Heat Treatment of a Candidate Material for 700 ℃ A-USC Power Plants显示文摘The preliminary chemical composition optimization and heat treatment parameters of Inconel 740 H were investigated systematically.Six heats of experimental alloys(designated as heat 401 to heat 406)with varied chemical compositions were subjected to standard heat treatment at four different solution temperatures.Due to its superior combination of strength,ductility,and toughness together with its minor mechanical property changes at different solution temperatures,heat 405 was chosen as an optimized one to conduct further heat treatment investigations.The evolution of grain size with solution temperature for heat 405 was studied and the optimal solution temperature was determined.After solution treatment at the optimal temperature,four different cooling rates were applied to investigate the effect of cooling rate on the size distribution modal and mean radius of theγ′precipitates.No bi-modal size distribution ofγ′precipitates was found for all cooling rates and water cooling was recommended for Inconel740 H.In addition,the effect of pre-aging at 800 ℃for 16 hon the microstructure of Inconel 740 Haged for a long time was studied.It is found that pre-aging at 800℃ would result in bi-modal size distribution ofγ′precipitates after long time aging at 750℃compared with mono-modal size distribution in samples without pre-aging,which might be caused by the difference in initial size distribution modal before Ostwald ripening ofγ′precipitates in samples with and without pre-aging at 800 ℃. | Yan CHONG Zheng-dong LIU Andy GODFREY Lu WANG Wei LIU Yu-qing WENG | 2015 | Journal of Iron and Steel Research(International)2015，22，2： | 2 |
| 6 | Microstructure evolution and mechanical properties of Inconel 740H during aging at 750 ~C 显示文摘 | Chong Y Liu Z Andy G | 2014 | Materials Science and Engineering: A2014，589，： | 1 |
| 7 | Generation of three-dimensional versatile vortex linear light bullets(Invited Paper)显示文摘We generate and measure the versatile vortex linear light bullet,which combines a high-order Bessel beam and an Airy pulse.This three-dimensional optical wave packet propagates without distortion in any medium,while carrying an orbital angular momentum.Its non-varying feature in linear propagation is verified by a threedimensional measurement.Such a novel versatile linear light bullet can be useful in various applications such as micromachining. | Han Li Xin Huang Qian Cao Yun Zhao Peiyun Li Chenchen Wan Andy Chong | 2017 | Chinese Optics Letters2017，15，3： | 1 |
| 8 | 光子飓风——具有光子横向轨道角动量的时空涡旋显示文摘众所周知,光子具有沿传播方向的线性动量。光子的线性动量在光与物质的相互作用中具有重要的作用。光子与物质的动量交换可以产生光压。2018年获得诺贝尔物理学奖的光镊技术基于微纳米颗粒对光子动量改变产生的光场梯度力。光子也具有沿传播方向的角动量,包括与圆偏振相关的自旋角动量和与涡旋相位关联的轨道角动量。近年来,研究表明在高数值孔径聚焦光场和隐失波光场中存在垂直于光束传播方向的光子横向自旋角动量[1]。那么是否存在垂直于光束传播方向的光子横向轨道角动量呢(图1)?我们最新的研究给出了肯定的答案,成果发表于《自然—光子学》[2]。 | 万辰皓 Andy Chong 詹其文 | 2020 | 物理2020，49，4： | 1 |
| 9 | High-energy femtosecond fiber lasers based on pulse propagation at normal dispersion显示文摘 | Wise Frank Chong Andy Renninger H William | 2008 | Laser & Photonics Reviews2008，2，12： | 1 |
| 10 | Wise Environmentally stable all-normal-dispersion femtosecond fiber laser 显示文摘 | ANDY Chong WILLIAM H RENNINGER | 2008 | Optic Letters2008，33，10： | 1 |
| 11 | Solvent‐Assisted Re‐annealing of Polymer Films for Solution‐Processable Organic Field‐Effect Transistors显示文摘 | Chong‐anDi KunLu LeiZhang YunqiLiu YunlongGuo XiangnanSun YugengWen GuiYu DaobenZhu | 2010 | Adv. Mater2010，，11： | 1 |
| 12 | Temporal manipulation of spatiotemporal optical vortices with an Airy pulse[Invited]显示文摘We demonstrate the temporal manipulation of spatiotemporal optical vortices(STOVs)by utilizing Airy pulses.By combining a STOV with an Airy temporal profile,the STOV exhibits nondispersive,self-accelerating,and self-healing features inherited from the Airy pulse propagation.Such features will enhance the control of STOVs in time. | Yimin Zang Fanli Wei Hee Sung Kim Andy Chong | 2023 | Chinese Optics Letters2023，21，8： | 0 |
| 13 | Propagation of transverse photonic orbital angular momentum through few-mode fiber显示文摘Spatiotemporal optical vortex(STOV)pulses can carry transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation.For a STOV pulse,its spatiotemporal profile can be significantly distorted due to unbalanced dispersive and diffractive phases.This may limit its use in many research applications,where a long interaction length and a tight confinement of the pulse are needed.The first demonstration of STOV pulse propagation through a few-mode optical fiber is presented.Both numerical and experimental analysis on the propagation of STOV pulse through a commercially available SMF-28 standard telecommunication fiber is performed.The spatiotemporal phase feature of the pulse can be well kept after the pulse propagates a few-meter length through the fiber even with bending.Further propagation of the pulse will result in a breakup of its spatiotemporal spiral phase structure due to an excessive amount of modal group delay dispersion.The stable and robust transmission of transverse photonic OAM through optical fiber may open new opportunities for transverse photonic OAM studies in telecommunications,OAM lasers,and nonlinear fiber-optical research. | Qian Cao Zhuo Chen Chong Zhang Andy Chong Qiwen Zhan | 2023 | Advanced Photonics2023，5，3： | 0 |
| 14 | Scalar optical hopfions显示文摘Hopfions are three-dimensional(3D)topological states discovered in field theory,magnetics,and hydrodynamics that resemble particle-like objects in physical space.Hopfions inherit the topological features of the Hopf fibration,a homotopic mapping from unit sphere in 4D space to unit sphere in 3D space.Here we design and demonstrate dynamic scalar optical hopfions in the shape of a toroidal vortex and expressed as an approximate solution to Maxwell’s equations.Equiphase lines correspond to disjoint and interlinked loops forming complete ring tori in 3D space.The Hopf invariant,product of two winding numbers,is determined by the topological charge of the poloidal spatiotemporal vortices and toroidal spatial vortices in toroidal coordinates.Optical hopfions provide a photonic testbed for studying topological states and may be utilized as high-dimensional information carriers. | Chenhao Wan Yijie Shen Andy Chong Qiwen Zhan | 2022 | eLight2022，2，1： | 0 |
| 15 | Tilted spatiotemporal optical vortex with partial temporal coherence [Invited]显示文摘We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal coherence.The theoretical study shows that the instantaneous spatiotemporal optical vortex is widely variable with the statistical orbital angular momentum(OAM)direction.While decreasing temporal coherence results in a larger variability of OAM tilt,the average OAM direction is relatively unchanged. | Jordan Adams Andy Chong | 2023 | Chinese Optics Letters2023，21，12： | 0 |
| 16 | Complex Swift Hohenberg equation dissipative soliton fiber laser显示文摘Complex Swift Hohenberg equation(CSHE)has attracted intensive research interest over the years,as it enables realistic modeling of mode-locked lasers with saturable absorbers by adding a fourth-order term to the spectral response.Many researchers have reported a variety of numerical solutions of CSHE which reveal interesting pulse patterns and structures.In this work,we have demonstrated a CSHE dissipative soliton fiber laser experimentally using a unique spectral filter with a complicated transmission profile.The behavior and performance of the laser agree qualitatively with the numerical simulations based on CSHE.Our findings bring insight into dissipative soliton dynamics and make our mode-locked laser a powerful testbed for observing dissipative solitons of CSHE,which may open a new course in ultrafast fiber laser research. | ANKITA KHANOLKAR YIMIN ZANG ANDY CHONG | 2021 | Photonics Research2021，9，6： | 0 |
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