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Fiber-optic grating inscription over splice interface for strain and temperature measurement

Fiber-optic grating inscription over splice interface for st...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Shuan-min Zhang Qi Wu An-feng Chen Jian Wang Wen-yi Ren Xi'an Institute of Applied Optics School of Science Northwest A&F University

A novel fiber Bragg grating(FBG) with three reflection wavelengths is proposed and demonstrated experimentally by simply phase-mask-based grating inscription over the splice interface between a thin-core fiber(TCF) and a standard single-mode fiber(SMF).The key to the success of this device lies in the refractive index differences between SMF,TCF and splice interface,and the precisely localized grating inscription over the three *** reflection wavelengths present different sensitivities to temperature and strain,making it as a good candidate for the measurements of two parameters simultaneously.

关键词： FBG strain temperature

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Study on light scattering characterization for polishing surface of optical elements

Study on light scattering characterization for polishing sur...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Zhang yingge Xi'an Technological University(China)

Based on the principle of bidirectional reflectance distribution function(BRDF),the relationship between the surface roughness and the spatial scattering distribution of the optical elements were ***,a series of optical components with different surface roughness was obtained by the traditional polishing processing,and measured by Talysurf CCI ***,the influences of different factor on the scattering characteristics were simulated,such as different surface roughness,incident wavelength and incident angle,and the influence law is ***,the experimental device was built,and the spatial distribution of scattered light was measured with the different conditions,and then the data curve variation was *** was shown that the experimental method was reliable by comparing the simulation and experimental *** on this to know,many studies on light scattering characteristics for optical element polishing surface can try later.

关键词： light scattering characteristic bidirectional reflectance distribution function surface roughness optical element

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Acceleration Sensing based on Graphene Resonator

Acceleration Sensing based on Graphene Resonator

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Jie Wenbin College of Optoelectronic Science and Engineering National University of Defense Technology(China)

This paper is concerned with the acceleration sensing based on graphene resonator using finite-element software COMSOL *** on the ordinary graphene resonator structure,a proof mass is attached to the surface of graphene sheet in order to sense acceleration and force more *** rectangle-shaped gold proof mass is positioned at the center of the graphene *** COMSOL Multiphysics,the simulations about how the graphene sheet and mass' dimension affect resonance frequency were performed and proper size parameters for the graphene resonator were *** adopting these parameters,the analysis about the resonance frequency's change responding to the acceleration or working force was carried out,which lays a foundation for further research of graphene resonator for acceleration sensing.

关键词： graphene resonator accelerometer acceleration sensing NEMs

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Theoretical study on affecting factors on squeezing level in the generation and detection of squeezed light

Theoretical study on affecting factors on squeezing level in...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Fengfei Xu Jiangmeng Ma Jingting Liu zunlong Beijing Huahang Radio Measurement Institute

We analyze the influence factors that affect the observed degree of squeezing in generation and detection stages theoretically,including the fluctuation of pump power,the intra-cavity loss of the optical parametric amplifier(OPA) cavity,the variations of the OPA cavity length,the phase fluctuation on balanced homodyning stage,the propagation efficiency,the mode matching efficiency,the out-put mirror transmission of the OPA cavity and the quantum efficiency of the *** theoretical results show that different loss sources appearing at various stages of the squeezed light generation and detection are for more dominant and in the end limit the squeezing level *** analysis of these parameters will be extremely useful for subsequent experiment.

关键词： Squeezed light Squeezed level Affecting factors

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Study on the key alignment technology of the catadioptric optical system

Study on the key alignment technology of the catadioptric op...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： chong song Xi'an Institute of Optics and Precision Mechanics(China)

Optical system alignment has a great influence on the whole system *** this paper,the processing of optical system alignment was mainly studied,the processing method of optics on the primary and secondary mirrors,front correction lens group and behind correction lens group with high precision centering lathe and internal focusing *** using the height indicator complete the system alignment of the primary mirror,secondary mirror,front correction group and behind correction ***,based on the zygo interferometer detect the wavefront *** this alignment program for catadioptric optical system,the wavefront aberration of optical system,focal length,modulation transfer function(MTF) and other technical indicators have reached the requirements.

关键词： catadioptric optical system micro-stress alignment wave aberration processing method of optics

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PREDICTING THE 1S CORE LEVEL SPECTROSCOPY OF BP USING FIRST PRINCIPLES

PREDICTING THE 1S CORE LEVEL SPECTROSCOPY OF BP USING FIRST ...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： WU Jun Fang School of Science Xi'an Polytechnic University

The 1 s core level excited spectra in BP were calculated using quantum mechanical methods from the first principles by *** 3D model of BP were reconstructed by simulation,and created a core hole on a boron atom and the phosphorus *** core level spectroscopy properties of BP with and without consideration of a core hole effects have calculated from first ***-hole effects were investigated through core level spectroscopy differences between standard ground state and supercell calculations that included the core hole by *** core level spectra properties were interpretated by ***-hole effects affect peak position and the width of energy.

关键词： Core level spectra core-hole effects quantum mechanical methods electronic transitions

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Generation of cylindrical-vector beams in a mode-locked all-fiber laser

Generation of cylindrical-vector beams in a mode-locked all-...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Dong Mao Northwestern Polytechnical Univ(China)

We report the direct generation of cylindrical-vector beams with a temporal duration of 6.9 ps in a mode-locked fiber laser using a carbon nanotube saturable *** offset splicing single-mode fiber and two-mode fiber,a part of the fundamental mode is converted into azimuthally-or radially-polarized *** a two-mode fiber Bragg grating,the residual fundamental mode is reflected back the radially-or azimuthally-polarized cylindrical-vector beam is exported from the *** ultrafast cylindricalvector beams exhibit unique features both in the temporal domain and spatial domain,providing a unique light source for nonlinear optics,laser machining,and nanoparticle manipulation.

关键词： cylindrical-vector beams mode-locked all-fiber laser carbon nanotube saturable absorber two-mode fiber Bragg grating

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Fourier transform profilometry based on mean envelope extraction

Fourier transform profilometry based on mean envelope extrac...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Zonghua Zhang N.Gao Z.Zhang Hebei University of Technology(China)

Based on an image pre-processing algorithm,a three-dimensional(3D) object measurement method is proposed by combining time domain and frequency domain ***,extreme points of sinusoidal fringes under the disturbance of noise are accurately ***,mean envelope of the fringe is obtained through appropriate interpolation method and then ***,phase information is extracted by using specific filtering in Fourier spectrum of the pre-processed fringe ***,simulated and experimental results show a good property of the proposed method in accuracy and measurement *** with color fringe projection technology,the proposed method can achieve one-shot measurement and will have wide applications in the field of fast measurement.

关键词： optical measurement phase measuring profilometry fast measurement image processing Fourier transform frequency aliasing

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Automatic Seamless Image Mosaic Method Based on SIFT Features

Automatic Seamless Image Mosaic Method Based on SIFT Feature...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Meiying Liu d.wen XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS(China)

An automatic seamless image mosaic method based on SIFT features is *** a scale-invariant feature extracting algorithm SIFT is used for feature extraction and matching,which gains sub-pixel precision for features ***,the transforming matrix H is computed with improved PROSAC algorithm,compared with RANSAC algorithm,the calculate efficiency is advanced,and the number of the inliers are *** the transforming matrix H is purify with LM *** finally image mosaic is completed with smoothing *** method implements automatically and avoids the disadvantages of traditional image mosaic method under different scale and illumination *** results show the image mosaic effect is wonderful and the algorithm is stable very *** is high valuable in practice.

关键词： image mosaic SIFT features PROSAC algorithm transforming matrix

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The influence of bonding layer to the quality of silver-based high reflector used in space optical system

The influence of bonding layer to the quality of silver-base...

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2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议

作者： Wang Li P.Wang G.Wang Y.Bai Beijing Institute of Space Mechanics & Electricity(China)

Silver-based high reflectance coatings are widely used in space optical *** silver is soft and has poor adhension to dielectric material used as *** layers are often added to overcome its major deficiency when silverbased reflectors are *** first principle method is used to study the improvement of adhesion owing to introducing Cu as bonding *** silver-based mirrors used in high temperature,diffusion of silver and copper will occur,the influence of diffusion to optical performance is also discussed and the experiment results are also given.

关键词： First principle method Electronic structure Silver-based coatings Ag-Cu alloy

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