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FP cavity and FBG cascaded optical fiber temperature and pressure sensor

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Chinese Optics Letters 2019年第4期17卷 39-43页

作者： Hui Li Qingchao Zhao Shaodong Jiang Jiasheng Ni Chang Wang laser institute Qilu University of Technology (Shandong Academy of Sciences)

A fiber Bragg grating(FBG) and Fabry–Perot(FP) cavity cascaded fiber sensing system was manufactured for temperature and pressure sensing. Temperature sensing as high as 175°C was performed by an FBG for the linear variation of an FBG wavelength with temperature. After the temperature was sensed, the demodulation system can find the original FP cavity length and its pressure and cavity length correlation coefficient; thus, the ambient pressure would be calculated. The sensing pressure can be as high as 100 MPa with a repeatability of 1/10,000 and high stability. This kind of fiber sensor has been used in the Shengli Oil Field.

关键词： fiber Bragg grating Fabry-Perot sensing pressure

Research on Optical Fiber Flow Test Method With Non-Intrusion

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Photonic Sensors 2014年第2期4卷 132-136页

作者： Ying SHANG laser Research institute of shandong academy of sciences Jinan 250014 China Key Laboratory of Optical Fiber Sensoring Technology of shandong Province Jinan 250014 China

In the field of oil well logging, real-time monitoring of the fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase in reservoir recovery, so a non-intrusive flow test method based on turbulent vibration was proposed. The specific length of the sensor fiber wound tightly around the outer wall of the pipe was connected with the optical fiber gratings at both ends, and the sensor fiber and the optical fiber gratings composed the flow sensing unit. The dynamic pressure was generated by the turbulence when fluid flows through the pipe, and the dynamic pressure resulted in the light phase shift of the sensor fiber. The phase information was demodulated by the fiber optic interferometer technology, time division multiplexing technology, and phase generated carrier modulation and demodulation techniques. The quadratic curve relationship between the phase change and flow rate was found by experimental data analysis, and the experiment confirmed the feasibility of the optical fiber flow test method with non-intrusion and achieved the real-time monitoring of the fluid flow.

关键词： il flow turbulent vibration the fiber optic interferometer phase generated carrier

Tunable and Linewidth-Reduced laser Diode Stack for Rubidium laser Pumping

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Chinese Physics Letters 2013年第11期30卷 88-90页

作者： LI Zhi-Yong TAN Rong-Qing XU Cheng LI Lin Department of High Power Gas laser Institute of ElectronicsChinese Academy of SciencesBeijing 100190 University of Chinese academy of sciences Beijing 100049

Linewidth of a laser diode stack with 5 bar is reduced to 0.2 nm from 1.8 nm through the use of an external volume Bragg grating(VBG)*** temperature of the VBG is controlled efficiently to make the central wavelength *** linewidth changes little in the wavelength-tuning *** the tunable range covers the rubidium D2 absorption line,the stack can be used to pump the rubidium laser efficiently.

关键词： tunable tuning pump

Quantitative Measurement of the Proportions of High-Order Harmonics for the 4B7B Soft-X-Ray Source at Beijing Synchrotron Radiation Facility

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Plasma Science and Technology 2013年第12期15卷 1194-1196页

作者：朱托尚万里张文海杨家敏熊刚赵阳况龙钰赵屹东郑雷崔明启唐坤马陈燕 Research Center of laser Fusion China Academy of Engineering Physics institute of High Energy Physics Chinese Academy of Sciences

A transmission grating coupled with an X-ray charge coupled device （CCD） is used to quantitatively measure the proportion of high-order harmonics of the soft-X-ray source of beam line 4B7B. The results show that the monochromatic X-ray has third-order and second-order harmonics. The proportion of second-order harmonic of 4B7B is less than 9.0% and the third- order harmonic is below 0.7% when no suppressing method is applied. When suppression methods are used, the proportion of second-order harmonic is less than 1.7% and the third-order harmonic is ignorable.

关键词： quantitative measurement high-order harmonics suppressing method

Photometric modeling of the Moon using Lommel-Seeliger function and Chang'E-1 IIM data

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Chinese Science Bulletin 2013年第36期58卷 4588-4592页

作者： ZHANG Jiang LING ZongCheng ZHANG WenXi REN Xin LI ChunLai LIU JianZhong School of Physics Shandong University School of Space Science and Physics & shandong Provincial Key Laboratory of Optical Astronomy & Solar-Terrestrial Environment Shandong University academy of Opto-Electronics Chinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences institute of Geochemistry Chinese Academy of Sciences

The imaging interferometer(IIM)aboard the Chang’E-1 lunar orbiter is the first multispectral imaging spectrometer for Chinese lunar *** science applications(e.g.,FeO and TiO2mapping)of the IIM raw data,the radiance variation due to changes in illumination and viewing geometry has to be removed from the radiometrically calibrated IIM Level 2A *** achieve this,we fit the IIM Level 2A radiance data with a Lommel-Seeliger photometric model consisting of an exponential term and a fourth order polynomial in the phase function,without distinguishing between lunar maria and *** exponential and the fourth order polynomial parameters are derived separately by fitting to two datasets divided at a solar phase angle threshold,avoiding a decrease in the phase function close to zero phase *** phase angle thresholds result in coincident fitting curves between 20°and 75°,while large discrepancies occur at other phase *** the derived photometric model is used to normalize the IIM Level 2A data to radiance values at an incidence and phase angle of 30°and emission angle of 0°.Our photometric model is validated by comparing two photometrically normalized IIM radiance spectra covering the same areas,showing a relative deviation consistent with the IIM preflight calibration.

关键词：月球探测器嫦娥一号光度成像光谱仪建模 M数辐射校准相位角

Efficient dual-wavelength operation of Nd:LYSO laser by diode pumping aimed toward the absorption peak

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Chinese Optics Letters 2011年第7期9卷 52-54页

作者：陈丽娟徐晓东王正平李东振于浩海徐军庄世栋郭磊赵永光许心光 State Key Laboratory of Crystal Materials and institute of Crystal Materials Shandong University Key Laboratory of Materials for High Power laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Key Laboratory of Transparent and Opto-Functional Inorganic Materials Shanghai Institute of Ceramics Chinese Academy of Sciences School of Science Shandong Jianzhu University

By aiming the pump wavelength of the laser （***5Luo.4975Yo.4975）2SiO5 （Nd：LYSO） crystal 1 079 nm is obtained. The maximum output power corresponding to an optical conversion efficiency of diode to the absorption peak at 811 an efficient dual-wavelength operation at 1 is 702 mW when the incident pump power is 27.7% and a slope efficiency of 37.0% of the 075 and 2.53W,

关键词： LYSO Efficient dual-wavelength operation of Nd Nd

Coaxial Multi-Wavelength Generation in YVO4 Crystal with Stimulated Raman Scattering Excited by a Picosecond-Pulsed 1064 laser

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Chinese Physics Letters 2020年第4期37卷 46-48页

作者： Jing-Jie Hao Wei Tu Nan Zong Yu Shensi Shen-Jin Zhang Yong Bo Qin-Jun Peng Zu-Yan Xu Key Lab of Solid State laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Key Lab of Function Crystal and laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese academy of sciences Beijing 100190

The multiwavelength characteristics of stimulated Raman scattering(SRS)in YVO4 crystal excited by a picosecond laser at 1064nm are investigated theoretically and *** output with seven wavelengths is achieved coaxially and synchronously at 894,972,1175,1312,1486,1713 and 2022 nm in a YVO4 *** maximum total Raman output energy is as high as 2.77mJ under the pump energy of 7.75mJ.A maximum total Raman conversion efficiency of 47.8%is obtained when the pump energy is 6.54 *** is the highest order of Stokes components and the highest output energy generated by YVO4 reported up to *** work expands the Raman spectrum of YVO4 crystal to the near-IR regime,with seven wavelengths covered at the same time,paving the way for new wavelength generation in the near-IR regime and its multiwavelength application.

关键词： pump scattering coaxial

Shape control technology during electrochemical synthesis of gold nanoparticles

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International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 486-492页

作者： Xiu-yu Liu Cong-ying Cui Ying-wen Cheng Hou-yi Ma Duo Liu State Key Lab of Crystal Materials Institute of Crystal MaterialsShandong University New Material institute of shandong academy of sciences School of Chemistry and Chemical Engineering Shandong University

Gold nanoparticles with different shapes and sizes were prepared by adding gold precursor （HAuC14） to an electrolyzed aqueous solution of poly（N-vinylpyrrolidone）（PVP） and KN03, which indicates the good reducing capacity of the PVP-containing solution after being treated by electrolysis. Using a catholyte and an anolyte as the reducing agents for HAuC14,＇ respectively, most gold nanoparticles were spherical particles in the former case but plate-like particles in the latter case. The change in the pH value of electrolytes caused by the electrolysis of water would be the origin of the differences in shape and morphology of gold nanoparticles. A hypothesis of the H＋ or OH- catalyzed PVP degradation mechanism was proposed to interpret why the pH value played a key role in determining the shape or morphology of gold nanoparticles. These experiments open up a new method for effectively controlling the shape and morphology of metal nanoparticles by using electrochemical methods.

关键词： metal nanopaxticles synthesis gold shape control electrochemical methods

A 37 mJ,100 Hz,high energy single frequency oscillator

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Chinese Physics B 2021年第8期30卷 392-397页

作者： Yu Shen Yong Bo Nan Zong Shenjin Zhang Qinjun Peng Zuyan Xu Research Center for laser Physics and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Solid State laser Key Laboratory of Function Crystal and Laser TechnologyChinese Academy of SciencesBeijing 100190China

Ways on energy enhancement for single frequency oscillator are reported in this *** quantitative analysis on gain and loss coefficients for each cavity mode with inserted etalons,a 37 mJ,100 Hz high energy single-frequency Nd:YAG oscillator is *** pulse energy is promoted by enhancement of nearly 7 times for a single frequency oscillator *** result proves that this method does help for energy *** has attractive potential for high energy single frequency oscillator design,especially on condition of intensive side pumped or long cavity laser,where strong competitors exist and are hard to be suppressed.

关键词： Nd:YAG laser high pulse energy single frequency oscillator