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Harnessing a multi-dimensional fibre laser using genetic wavefront shaping

Light(Science & Applications) 2020年第1期9卷 593-602页

作者： Xiaoming Wei Joseph C.Jing Yuecheng Shen Lihong V.Wang Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 East California Boulevard MailCode 138-78Pasadena 91125 CAUSA School of Physics and Optoelectronics/State Key Laboratory of Luminescent Materials and Devices/Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices/Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology381 Wushan RoadGuangzhou 510640China School of Electronics and Information Technology Sun Yatsen UniversityGuangzhou 510006China

The multi-dimensional laser is a fascinating platform not only for the discovery and understanding of new higherdimensional coherent lightwaves but also for the frontier study of the complex three-dimensional(3D)nonlinear dynamics and solitary waves widely involved in physics,chemistry,biology and materials *** controlling coherent lightwave oscillation in multi-dimensional lasers,however,is challenging and has largely been unexplored;yet,it is crucial for both designing 3D coherent light fields and unveiling any underlying nonlinear ***,for the first time,we genetically harness a multi-dimensional fibre laser using intracavity wavefront shaping technology such that versatile lasing characteristics can be *** demonstrate that the output power,mode profile,optical spectrum and mode-locking operation can be genetically optimized by appropriately designing the objective function of the genetic *** is anticipated that this genetic and systematic intracavity control technology for multi-dimensional lasers will be an important step for obtaining high-performance 3D lasing and presents many possibilities for exploring multi-dimensional nonlinear dynamics and solitary waves that may enable new applications.

关键词： fibre dimensional coherent

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Low-loss silicon core fibre platform for mid-infrared nonlinear photonics

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Light(Science & Applications) 2019年第1期8卷 202-211页

作者： Haonan Ren Li Shen Antoine F.J.Runge Thomas W.Hawkins John Ballato Ursula Gibson Anna C.Peacock Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology430074 WuhanChina Department of Materials Science and Engineering Clemson UniversityClemsonSC 29634USA Department of Physics Norwegian University of Science and Technology(NTNU)N-7491 TrondheimNorway Department of Applied Physics KTH Royal Institute of Technology10044 StockholmSweden The Institute of Photonics and Optical Science(IPOS) School of PhysicsUniversity of SydneySydneyNSW 2006Australia

Broadband mid-infrared light sources are highly desired for wide-ranging applications that span free-space communications to *** recent years,silicon has attracted great interest as a platform for nonlinear optical wavelength conversion in this region,owing to its low losses(linear and nonlinear)and high ***,most research in this area has made use of small core waveguides fabricated from silicon-on-insulator platforms,which suffer from high absorption losses of the use of silica cladding,limiting their ability to generate light beyond 3μ***,we design and demonstrate a compact silicon core,silica-clad waveguide platform that has low losses across the entire silicon transparency *** waveguides are fabricated from a silicon core fibre that is tapered to engineer mode properties to ensure efficient nonlinear propagation in the core with minimal interaction of the mid-infrared light with the *** waveguides exhibit many of the benefits of fibre platforms,such as a high coupling efficiency and power handling capability,allowing for the generation of mid-infrared supercontinuum spectra with high brightness and coherence spanning almost two octaves(1.6-5.3μm).

关键词： waveguide fibre nonlinear

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Phonon imaging in 3D with a fibre probe

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Light(Science & Applications) 2021年第6期10卷 1007-1019页

作者： Salvatore La Cavera III Fernando Perez-Cota Richard JSmith Matt Clark Optics and Photonics Group Faculty of EngineeringUniversity of NottinghamUniversity ParkNottingham NG72RDUK

We show for the first time that a single ultrasonic imaging fibre is capable of simultaneously accessing 3D spatial information and mechanical properties from microscopic *** novel measurement system consists of two ultrafast lasers that excite and detect high-frequency ultrasound from a nano-transducer that was fabricated onto the tip of a single-mode optical fibre.A signal processing technique was also developed to extract nanometric in-depth spatial measurements from GHz frequency acoustic waves,while still allowing Brillouin spectroscopy in the frequency ***-free and non-contact imaging performance was demonstrated on various polymer *** singular device is equipped with optical lateral resolution,2.5μm,and a depth-profiling precision of 45 nm provided by *** endoscopic potential for this device is exhibited by extrapolating the single fibre to tens of thousands of fibres in an imaging *** a device catalyses future phonon endomicroscopy technology that brings the prospect of label-free in vivo histology within reach.

关键词： fibre equipped acoustics

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Analysis of SF6 decomposed products by fibre-enhanced Raman spectroscopy for gas-insulated switchgear diagnosis

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High Voltage 2024年第1期9卷 206-216页

作者： Jianxin Wang Weigen Chen Pinyi Wang Fu Wan Zhixian Zhang Shoufei Gao Yingying Wang School of Electrical Engineering Chongqing UniversityChongqingChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Institute of Photonics Technology Jinan UniversityGuangzhouChina

Sulphur hexafluoride(SF6)decomposed products analysis is highly critical in the earlystage fault diagnosis of gas-insulated switchgear(GIS).Spectrum technology outperforms traditional methods on non-invasiveness,no sample preparation,and no ***,the authors present an improved fibre-enhanced Raman spectroscopy(FERS)as a comprehensive analytical tool to detect a suite of SF_(6)decomposed products(SO_(2)F_(2),SOF_(2),SO_(2),H_(2)S,CF_(4),OCS,CO_(2),and CO).The FERS approach is combined with two iris diaphragms for spatial filtering and a rear-end reflector for additional Raman signal *** of detection down to 1×10^(−6)–8×10^(−6)are achieved for different SF6 decompositions,and quantification of an undefined multigas,sampled from an 800 kV GIS in service,is realised utilising SF6 as the internal standard gas and with a maximum error of 5.5%.The GIS is diagnosed according to the results and confirmed by an on-site *** authors foresee that this technique will provide a route for trace gas analysis in the power industry.

关键词： SF6 diagnosis fibre

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Towards visible-wavelength passively mode-locked lasers in all-fibre format

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Light(Science & Applications) 2020年第1期9卷 1438-1447页

作者： Jinhai Zou Chuchu Dong Hongjian Wang Tuanjie Du Zhengqian Luo Department of Electronic Engineering Xiamen University361005 XiamenChina

Mode-locked fibre lasers(MLFLs)are fundamental building blocks of many photonic systems used in industrial,scientific and biomedical *** date,1–2μm MLFLs have been well developed;however,passively modelocked fibre lasers in the visible region(380–760 nm)have never been ***,we address this challenge by demonstrating an all-fibre visible-wavelength passively mode-locked picosecond laser at 635 *** 635 nm mode-locked laser with an all-fibre figure-eight cavity uses a Pr/Yb codoped ZBLAN fibre as the visible gain medium and a nonlinear amplifying loop mirror as the mode-locking ***,we theoretically predict and analyse the formation and evolution of 635 nm mode-locked pulses in the dissipative soliton resonance(DSR)regime by solving the Ginzburg-Landau ***,we experimentally demonstrate the stable generation of 635 nm DSR mode-locked pulses with a pulse duration as short as~96 ps,a radio-frequency signal-to-noise ratio of 67 dB and a narrow spectral bandwidth of 1 nm)and modulated optical *** work represents an important step towards miniaturized ultrafast fibre lasers in the visible spectral region.

关键词： passive fibre visible

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Real-time observation of frequency Bloch oscillations with fibre loop modulation

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Light(Science & Applications) 2021年第3期10卷 434-442页

作者： Hao Chen NingNing Yang Chengzhi Qin Wenwan Li Bing Wang Tianwen Han Chi Zhang Weiwei Liu Kai Wang Hua Long Xinliang Zhang Peixiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Bloch oscillations(BOs)were initially predicted for electrons in a solid lattice to which a static electric field is *** observation of BOs in solids remains challenging due to the collision scattering and barrier tunnelling of ***,analogies of electron BOs for photons,acoustic phonons and cold atoms have been experimentally demonstrated in various lattice ***,BOs in the frequency dimension have been proposed and studied by using an optical micro-resonator,which provides a unique approach to controlling the light ***,the finite resonator lifetime and intrinsic loss hinder the effect from being observed ***,we experimentally demonstrate BOs in a synthetic frequency lattice by employing a fibre-loop circuit with detuned phase *** show that a detuning between the modulation period and the fibre-loop roundtrip time acts as an effective vector potential and hence a constant effective force that can yield BOs in the modulation-induced frequency *** a dispersive Fourier transformation,the pulse spectrum can be mapped into the time dimension,and its transient evolution can be precisely *** study offers a promising approach to realising BOs in synthetic dimensions and may find applications in frequency manipulations in optical fibre communication systems.

关键词： fibre Bloch dimension

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Ultrahigh numerical aperture meta-fibre for flexible optical trapping

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Light(Science & Applications) 2021年第4期10卷 589-599页

作者： Malte Plidschun Haoran Ren Jisoo Kim Ronny Forster Stefan A.Maier Markus A.Schmidt Leibniz Institute of Photonic Technology 07745 JenaGermany Abbe Center of Photonics and Faculty of Physics FSU Jena07745 JenaGermany Chair in Hybrid Nanosystems Nanoinstitute MunichLMU Munchen80539 MunchenGermany Department of Physics Imperial College LondonLondon SW72AZUK Otto Schott Institute of Material Research FSU Jena07745 JenaGermany

Strong focusing on diffraction-limited spots is essential for many photonic applications and is particularly relevant for optical trapping;however,all currently used approaches fail to simultaneously provide flexible transportation of light,straightforward implementation,compatibility with waveguide circuitry,and strong ***,we demonstrate the design and 3D nanoprinting of an ultrahigh numerical aperture meta-fibre for highly flexible optical *** into account the peculiarities of the fibre environment,we implemented an ultrathin meta-lens on the facet of a modified single-mode optical fibre via direct laser writing,leading to a diffraction-limited focal spot with a recordhigh numerical aperture of up to NA≈*** unique capabilities of this flexible,cost-effective,bio-and fibre-circuitrycompatible meta-fibre device were demonstrated by optically trapping microbeads and bacteria for the first time with only one single-mode fibre in combination with diffractive *** study highlights the relevance of the unexplored but exciting field of meta-fibre optics to a multitude of fields,such as bioanalytics,quantum technology and life sciences.

关键词： optical waveguide fibre

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A passive optical fibre sensor based on Fabry-Perot interferometry for bipolar electrostatic monitoring of insulating dielectrics

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High Voltage 2023年第4期8卷 682-689页

作者： Jiawei Zhang Zifan Ye Li Wang Zelei Zhang Fan Xu Weichen Dang Takao Matsumoto Sombel Diaham Chatchai Putson School of Electrical Engineering Xi'an University of TechnologyXi'anShaanxiChina Universitéde Toulouse UPSINPTLAPLACE(Laboratoire Plasma et Conversion d'Energie)Toulouse Cedex 9France Materials Physics Laboratory Department of PhysicsFaculty of SciencePrince of Songkla University(PSU)SongkhlaThailand

The measurement of the surface charge on the insulating dielectrics is critical to estimate the insulation strength of electrical equipment in *** interactions with the electromagnetic field,however,generally result in distortion measurement of active ***,it is of great significance to investigate a passive sensor for monitoring the deposited ***,a passive optical fibre electrostatic sensor is developed on the principle of Fabry–Perot interference to quantify the surface potential of the insulating *** sensitivity of quantifying the electrostatic charge is explored in terms of the wavelength shift in the interference spectrum,and the linear correlation is ***,the sensor can identify a negative quadratic trend with the increase of the surface roughness of the insulating *** merits of the proposed sensor such as passive monitoring,bipolar electrostatic detection,and the excellent ability of antielectromagnetic interference are highlighted in the ***,this sensor can serve as an effective tool to monitor the electrostatic charge in the fields of smart electrical equipment,fuel transportation,aerospace,integrate circuit etc.

关键词： electrostatic passive fibre

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Graphene oxide membranes supported on the ceramic hollow fibre for efficient H2 recovery

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Chinese Journal of Chemical Engineering 2017年第6期25卷 752-759页

作者： Kang Huang Jianwei Yuan Guoshun Shen Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Jiangsu National Synergetic Innovation Cen terfor Advanced Materials Nanjing Tech UniversityNanjing 210009 China

The special channels and intrinsic defects within GO laminates make it a very potential candidate for gas separation in recent years. Herein, the gas separation performance of GO membranes prepared on the surface of ceramicα-Al_2O_3 hollow fibre was investigated systematically. The microstructures of ceramic hollow fibre supported GO membranes were optimized by adjusting operation conditions. And, the GO membrane fabricated at 30 min exhibited great promising H_2 recovery ability from H_2/CO_2 mixture. At room temperature, the H_2 permeance was over 1.00 × 10^(-7)mol·m^(-2)·s^(-1)·Pa^(-1)for both single gas and binary mixture. The corresponding ideal selectivity and mixture separation factor reached around 15 and 10, respectively. In addition, humility, operation temperature, H_2 concentration in the feed and the reproducibility were also studied in this work.

关键词： Graphene oxide Ceramic hollow fibre Gas separation Hydrogen recovery

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Advances in fibre optic based geotechnical monitoring systems for underground excavations

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International Journal of Mining Science and Technology 2019年第2期29卷 229-238页

作者： Hongkui Gong Mehmet S.Kizil Zhongwei Chen Moe Amanzadeh Ben Yang Saiied M.Aminossadati School of Mechanical and Mining Engineering The University of Queensland

Geotechnical stability is a major concern for the long-term safety and integrity of underground infrastructures such as tunnels, railway stations, mine shafts and hydraulic power chambers. An effective geotechnical monitoring system is able to provide adequate warning to underground personnel prior to any unexpected major geotechnical failure. This paper reviews the conventional geotechnical monitoring sensors and the emerging fibre Optic Sensing(FOS) techniques, pointing out their unique features and major differences. Recent advances in various FOS based monitoring systems, including Brillouin time domain distributed optical sensors and fibre Bragg grating(FBG) sensors, are investigated through a critical review of the laboratory studies and field applications used for underground geotechnical monitoring. Particular emphasis is given to fibre packaging, temperature compensation, installation methods and instrumentation performance in the underground environment. A detailed discussion of the advantages and limitations of each FOS monitoring system is also presented in this paper.

关键词： Underground geotechnical monitoring Conventional geotechnical instruments Distributed optical fibre sensors fibre Bragg grating Brillouin optical analysis

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