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3D-Simulations of Transverse optical Modes of the Free Electron Laser resonator with Hole Output Coupling

Communications in Computational Physics 2006年第5期1卷 920-929页

作者： Yu-Huan Dou Xiao-Jian Shu Yuan-Zhang Wang Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088P.R.China

The transverse construction of optical modes in the wiggler is calculated and the numerical simulations of the free-electron laser hole-coupled resonator are carried *** 3D-simulations include optical amplitude distributions,modes evolvement of optical field and the influence of hole-radius on the distributing of *** nu-merical simulations confirm that the fraction of the even-order modes increase in the start-up stage and then decreases in the exponential gain ***,it is found that the fundamental mode is dominant in the saturate *** on this observa-tion,we estimate the optical output coupling by using the the fundamental *** is found that the numerical results and the first-order estimate are in good agreement for a range of the hole size.

关键词： Free-electron laser optical resonator mode analysis numerical simulation

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Plasmonic microcavity formed by the M ¨obius strip

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Chinese Physics B 2017年第3期26卷 483-488页

作者：曾扬王智勇吴远陆兰松王云祥史双瑾邱琪 School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China

We propose a Mobius-strip-type plasmonic cavity with a silver Mobius strip sandwiched between dielectric layers. By brief theoretical and simulation analyses, we obtain that the Q factor of the cavity remains about 40 and the mode volume is ultrasmall （less than 1 μm3） which is more compact than that of the cylindric cavity. This Mobius-stfip-type plasmonic cavity supporting the propagation of surface plasrnon polaritons owns some unusual properties such as more effective volume and the spatial separation. More potential applications based on this cavity remain to be explored in future nanophotonics.

关键词： suface plamons optical resonator

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Monolithically integrated stretchable photonics

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Light(Science & Applications) 2017年第1期6卷 210-217页

作者： Lan Li Hongtao Lin Shutao Qiao Yi-Zhong Huang Jun-Ying Li Jérôme Michon Tian Gu Carlos Alosno-Ramos Laurent Vivien Anupama Yadav Kathleen Richardson Nanshu Lu Juejun Hu Department of Materials Science&Engineering Massachusetts Institute of TechnologyCambridgeMassachusettsUSA Department of Aerospace Engineering and Engineering Mechanics University of Texas at AustinAustinTexasUSA Department of Electronic Engineering Xiamen UniversityXiamenChina Key Laboratory of Optoelectronic Technology&System Education Ministry of ChinaCollege of Opto-Electronic EngineeringChongqing UniversityChongqingChina Centre for Nanoscience and Nanotechnology CNRSUniv.Paris-SudUniversite Paris-SaclayOrsayC2N-OrsayFrance The College of Optics&Photonics University of Central FloridaOrlandoFloridaUSA

Mechanically stretchable photonics provides a new geometric degree of freedom for photonic system design and foresees applications ranging from artificial skins to soft wearable *** we describe the design and experimental realization of the first single-mode stretchable photonic *** devices,made of chalcogenide glass and epoxy polymer materials,are monolithically integrated on elastomer *** impart mechanical stretching capability to devices built using these intrinsically brittle materials,our design strategy involves local substrate stiffening to minimize shape deformation of critical photonic components,and interconnecting optical waveguides assuming a meandering Euler spiral geometry to mitigate radiative optical *** fabricated following such design can sustain 41%nominal tensile strain and 3000 stretching cycles without measurable degradation in optical *** addition,we present a rigorous analytical model to quantitatively predict stressoptical coupling behavior in waveguide devices of arbitrary geometry without using a single fitting parameter.

关键词： chalcogenide glass integrated photonics optical resonator strain-optical coupling stretchable photonics

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Dynamic range expansion for optical frequency shift detection based on multiple harmonics

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Chinese Optics Letters 2024年第4期22卷 42-47页

作者：周彦汝樊李凡徐凯刘文耀邢恩博唐军刘俊 State Key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan 030051China School of Information&Communication Engineering North University of ChinaTaiyuan 030051China School of Instrument&Electronics North University of ChinaTaiyuan 030051China

Sensors based on optical resonators often have their measurement range limited by their cavity linewidth,particularly in the measurement of time-varying *** paper introduces a method for optical frequency shift detection using multiple harmonics to expand the dynamic range of sensors based on optical *** proposed method expands the measurement range of optical frequency shift beyond the cavity linewidth while maintaining measurement *** theoretical derivation of this method is carried out based on the equation of motion for an optical resonator and the recursive relationship of the Bessel *** results show that the dynamic range is expanded to 4 times greater than the conventional first harmonic method while still maintaining ***,we present an objective analysis of the correlation between the expansion factor of the method and the linewidth and free spectrum of the optical resonator.

关键词： optical resonator optical frequency shift multiple harmonics dynamic range expansion

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Single-frequency coupled concentric ring resonator laser

Single-frequency coupled concentric ring resonator laser

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上海市激光学会2009年学术年会

作者： Xin Tu Hao Li Xiang Wu Liying Liu Lei Xu Department of optical Science and Engineering School of Information Science and EngineeringFudan University Department of Physics Fudan University Lab of Advanced Materials Fudan University

The study of single-frequency lasers is always an attractive subject because of their broad applications such as in optical communication,biochemical sensing and *** techniques have been used to achieve single-frequency laser as follows:short cavity length method,distributed-feedback(DFB) grating,photonic-crystal-defect microcavities and coupled-cavity *** this letter,we demonstrate a single-frequency coupled concentric ring resonator(CCRR) laser using the coupled-cavity structure because mircoring resonators have small mode volumes and high quality factors,leading to ultralow threshold and high *** fabricate a CCRR laser,a segment of commercial fiber with a diameter D=125 μm is coated with photo-polymerizable organic-inorganic hybrid materials doped with 0.5 wt.%Rhodamine B(thickness di =3.5 urn,refractive index n = 1.52).After being exposed to UV light to consolidate,polycarbonate film(thickness d= 45 nm,refractive index n = 1.59) is coated and consolidated in the same *** the inside diameter of the CCRR is expressed as D(=D+2d) and outside diameter is D(=D+2d+2d).In our experiment the CCRR is flood pumped by a 30 ps 532 nm mode-locked laser with a repetition rate of 10 *** lasing emission is collected through free space and sent to a spectrometer(spectral resolution = 0.03 nm).The concentric ring resonator introduces interesting phenomena in the WGM because of the coupling effect between different *** internal ring will lase first at λ that satisfies Mλ=πnD,where M is an *** of the laser light is coupled to the external ring due to the partial reflection at the interface of the double rings,which will be dissipated unless λ is also under resonance for the external ring satisfying Mλ = π*** effect is called the Vernier *** has been proposed for expanding the FSR of the interference filter and has been used in external cavity *** the internal ring resonator works as an oscillator for w

关键词： organic/inorganic hybrid materials optical resonator single-frequency laser coupled resonator

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