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A novel fiber-laser-based fiber Bragg grating strain sensor with high-birefringence Sagnac fiber loop mirror

Chinese Optics Letters 2008年第11期6卷 818-820页

作者：许鸥鲁韶华冯素春简水生 Key Lab of All Optical Network and Advanced Telecommunication Network Ministry of Education of China.Beijing Jiaotong UuiversityBeijing 100044 Institute of Lightwave Technology.Beijing Jiaotong University.Beijing 100044

A novel fiber-laser-based strain sensor is proposed and experimentally demonstrated. The laser cavity is composed of a high-birefringence Sagnac fiber loop mirror （HiBi-SFLM） and a fiber Bragg grating （FBG） which also acts as a strain-sensing element. In the linear region of the HiBi-SFLM reflection spectrum, when the strain applied on the FBG makes the Bragg grating wavelength shift, the laser output power changes due to refleetivity variation of the HiBi-SFLM. Experimental results show that the laser output power varies almost linearly with the applied strain. The measurement of the output power can be performed by a conventional photo-detector.

关键词： Diode pumped lasers Fiber Bragg grating sensors Fiber Bragg gratings Fiber lasers Polarization maintaining fibers rare earth doped materials

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Preparation and upconversion luminescence of YVO_4:Er^(3+),Yb^(3+)

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International Journal of Minerals,Metallurgy and materials 2010年第2期17卷 225-228页

作者： Yong-ming Zhang Yan-hong Li Peng Li Guang-yan Hong Ying-ning Yu School of materials Science and Engineering Shenyang Institute of Chemical Technology Shenyang 110142 China Key Laboratory of rare earth Chemistry and Physics Chinese Academy of Sciences Changchun 130022 China

YVO4：Er^3＋,Yb^3＋ with varying Yb^3＋ concentrations were prepared by a precipitation *** results of X-ray diffraction （XRD） show that all the samples have a tetragonal zircon structure; the calculated average crystallite sizes are in the range of 14-22 *** lattice constants and cell volume of the samples decrease slightly with the increase in Yb^3＋ *** upconversion luminescence spectra of all the samples were studied under 980 nm laser *** strong green emission is observed,which is attributed to the 2^H11/2→4I15/2 and 4^S3/2→4^I15/2 transitions of Er^3＋,and the red emission peaks in 650-675 nm can be *** emission intensity for the sample depends on the Yb^3＋*** results reveal that the upconversion processes of YVO4：Er^3＋,Yb^3＋ are related to the structure and the doping Yb^3＋ concentration of the sample.

关键词： yttrium vanadate rare earth doped materials precipitation method upconversion luminescence

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Spectroscopic study of the Pr-doped BiBO glass and Ca_4GdO(BO_3)_3 single crystals

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Journal of rare earths 2009年第4期27卷 612-615页

作者： A.Majchrowski M.G.Brik G.A.Kumar K.Ozga I.Sildos A.Suchocki A.lezak T.Lukasiewicz I.V.Kityk Institute of Applied Physics Military University of Technology Kaliskiego Warsaw 00-908 Poland Institute of Physics University of Tartu Riia 142 Tartu 51014 Estonia Department of Material Science and Engineering The State University of New Jersey NJ 08854-8065 USA Institute of Biology and Biophysics Czestochowa University of Technology Al.Armii Krajowej 36B Czestochowa 42-200 Poland Institute of Physics Polish Academy of Science Al.Lotników 32/46 Warsaw 02-668 Poland Institute of Electronic materials Technolog Wolczanska 133 Warsaw 01-919 Poland Electrical Engineering Department Technological University of Czestochowa Al.Armii Krajowej 17/19 Czestochowa Poland

Detailed spectroscopic studies of Pr3＋ ions in BiBO glass and Ca4GdO（BO3）3 crystal were performed. Experimental absorption spectra were measured at room temperature and assigned. The first principles discrete variational multielectron method was used to model the polarized absorption spectra of the Ca2GdO（BO3）3：Pr3＋; without any fitting parameters, the overall appearance of the spectra was reproduced satisfactorily. The energy intervals between different molecular orbitals in the [PrO6] cluster were estimated. The conventional Judd-Ofelt theory was used to calculate the oscillator strengths of the 4f-4f transitions in the BiBO：Pr3＋ system; the set of the phenomenological intensity parameters was determined.

关键词： rare earth doped materials praseodymium absorption spectra

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