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Diode-pumped high-efficiency Tm:YLF laser at room temperature

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Chinese Optics Letters 2008年第8期6卷 591-593页

作者：段小明姚宝权张云军宋成伟鞠有伦王月珠 National Key Laboratory of Tunable Laser technology Harbin Institute of Technology

High-efficiency continuous-wave （CW） Tm：YLF laser by the dual-end-pumping configuration is presented. Under the total input pump power of 24.0 W, the highest output power reaches 9.8 W in the wavelength range of 1910 - 1926 nm by use of 10% output coupling, corresponding to optical conversion efficiency of 40.9% and slope efficiency of 51.4%. The free-running laser spectrum of Tm：YLF is measured.

关键词： Conversion efficiency

Continuous-wave operation of a room-temperature Tm:YAP-pumped Ho:YAG laser

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Chinese Optics Letters 2008年第7期6卷 520-522页

作者：姚宝权段小明李玉峰郑亮亮王月珠赵广军徐军 National Key Laboratory of Tunable Laser technology Harbin Institute of TechnologyHarbin 150001 Laser and Optoelectronic Functional Material It and D Center Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

We report a continuous-wave （CW） 2.1-μm Ho：YAG laser operating at room temperature pumped by a diode-pumped 1.94-μm Tm：YAP laser. The maximum output power of 1.5 W is obtained from Ho：YAG laser, corresponding t... 详细信息

关键词： Conversion efficiency Fiber lasers Lasers

Fabrication and Testing of Carbon Fiber Reinforced Truss Core Sandwich Panels

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Journal of Materials Science & technology 2009年第4期25卷 547-550页

作者： Bing Wang Linzhi Wu Li Ma Qiang Wang Shanyi Du Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

Truss core sandwich panels reinforced by carbon fibers were assembled with bonded laminate facesheets and carbon fiber reinforced truss cores. The top and bottom facesheets were interconnected with truss cores. Both ends of the truss cores were embedded into four layers of top and bottom facesheets. The mechanical properties of truss core sandwich panels were then investigated under out-of-plane and in-plane compression loadings to reveal the failure mechanisms of sandwich panels. Experimental results indicated that the mechanical behavior of sandwich structure under in-plane loading is dominated by the buckling and debonding of facesheets.

关键词： Sandwich panel Truss core Carbon fiber

Wind error comparison of four different wavelengths of Nd:YAG laser

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Chinese Optics Letters 2009年第5期7卷 364-367页

作者：张合勇任德明赵卫疆曲彦臣 Department of Optic-Electronics Information Science and technology Harbin Institute of Technology

The wind error of multichannel lidar system is simulated through calculation of atmospheric back-sacttering echo signal and weighted least-square fitting. By comparing the wind errors of four wavelengths of the Nd：YAG laser, two kinds of phenomena are found： when the wavelength is 1064 nm, the wind error is the smallest at all different heights; with the aerosol-molecular ratio descending and finally tending to 1, the statistic error increases sharply, which shows that low aerosol-molecular ratio is quite disadvantageous whatever the signal intensity is.

关键词： Atmospheric aerosols Neodymium Optical radar

Room Temperature Diode-Pumped Tunable Single-Frequency Tm:YAG Ceramic Laser

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Chinese Physics Letters 2013年第2期30卷 132-134页

作者： YAO Bao-Quan YU Xiao JU You-Lun LIU Wen-Bin JIANG Ben-Xue PAN Yu-Bo National Key Laboratory of Tunable Laser technology Harbin Institute of TechnologyHarbin 150001 Shanghai institute of Ceramics Chinese Academy of SciencesShanghai 200050

A single-longitudinal-mode(SLM)Tm:YAG ceramic laser under room temperature conditions using double Fabry-Pérot etalons is *** maximum single-frequency output power is 318 mW with a slope efficiency of 12.6%.The wavelength tuning range from 2005 nm to 2029 nm is achieved by tuning the obliquity of a 0.1-mm-thick *** single frequency laser has a beam quality of M^(2)=1.3 at the maximum single-frequency output *** result is reported for the first time to the best of our *** SLM Tm:YAG ceramic laser can replace the Tm:YAG single crystal laser to be used as the seed laser for LIDAR laser systems.

关键词： tuning laser ceramic

Acquisition performance analysis for intersatellite optical communications with vibration influence

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Chinese Physics B 2020年第1期29卷 280-286页

作者： Jing Ma Gaoyuan Lu Siyuan Yu Liying Tan Yulong Fu Fajun Li National Key Laboratory of Tunable Laser technology Harbin Institute of TechnologyHarbin 150001China

A stable and accurate pointing,acquisition system is an important part of initially building intersatellite optical communication *** platform vibration can cause the system instability and reduce the system precision in building and maintenance of a satellite optical communication *** this paper,vibration influence is consciously discussed by acquisition time for intersatellite optical *** expression of acquisition possibility is derived,taking the scan parameters and platform vibration into account,and vibration influence on the multi-scan acquisition time is also *** theoretical result calculated by the proposed analytical expression is approximate to the result by the Monte Carlo simulation.

关键词： optical communication systems optical communications acquisition time vibration influence

Effect of electromagnetic force on melt induced by traveling magnetic field

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Transactions of Nonferrous Metals Society of China 2010年第4期20卷 662-667页

作者：苏彦庆徐严谨赵雷郭景杰傅恒志 School of Materials Science and Engineering Harbin Institute of Technology

A new apparatus was designed to measure the electromagnetic force and a computational study of the traveling magnetic field(TMF)and its application to the Ga-In-Sn melt(with low melting point),then the forces on Al,Mg,and Li melt,were simulated. The result show that the electromagnetic force on the melt increases linearly with the increasing length of the melt in the *** TMF-induced Lorentz force increases with increasing frequency,and then *** maximum value is obtained when the current frequency is 160 Hz,over that frequency the force decreases *** the iron-core is activated,the force increases when the melt closes to the *** Lorentz forces have inversely-proportional relationships with the electrical resistivity,the dfx/dρdecreases and the dfy/dρincreases with the increasing electrical resistivity(df/dρis the slope of the Lorentz force profile).

关键词： electromagnetic force traveling magnetic field Ga-In-Sn melt molten metal

Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser

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Chinese Physics B 2009年第3期18卷 1009-1013页

作者：姚宝权郑亮亮杨晓涛王天衡段小明赵广军董勤 National Key Laboratory of Tunable Laser technology Harbin Institute of Technology R&D Center for Laser and Opto-Electronic Materials Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

The Ho：YAP crystal is grown by the Czochralski technique. The room-temperature polarized absorption spectra of Ho：YAP crystal was measured on a c-cut sample with 1 at% holmium. According to the obtained Judd-Ofelt intensity parameters Ω2 = 1.42 × 10^-20cm^2, Ω4 = 2.92 ×10^-20 cm^2, and Ω6 =1.71 ×10^-20cm^2, this paper calculated the fluorescence lifetime to be 6 ms for ^5I7→^5Is transition, and the integrated emission cross section to be 2.24 × 10^-18 cm^2. It investigates the room-temperature Ho：YAP laser end-pumped by a 1.91-μm Tm：YLF laser. The maximum output power was 4.1 W when the incident 1.91-μm pump power was 14.4W. The slope efficiency is 40.8%, corresponding to an optical-to-optical conversion efficiency of 28.4%. The Ho：YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8nm.

关键词： Ho:YAlO3 solid-state lasers Judd-Ofelt analysis Tm:YLF laser

Experimental investigation on wake profile detection based on laser scattering by bubbles

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Chinese Optics Letters 2007年第10期5卷 609-612页

作者：苏丽萍赵卫疆胡孝勇任德明刘西站 institute of Opto-Electronics Harbin Institute of Technology

The optical system for detecting wake profiles based on laser backscattering by bubbles at 180° is reported, in which the monostatic optical geometry is adopted and the power density estimation is used to process bubble scattering signal. The profiles of wakes produced by a two-blade propeller with a diameter of 46 mm at 6000 and 8000 rpm are measured using this system. It is shown that the wake region can be identified, the wake with different shapes can be distinguished, and the fine structure within wakes can be detected. Also, the repeatability of the results is tested experimentally. Results show the feasibility of this system in wake profile detection.

关键词： Backscattering Bubbles (in fluids) Laser beams Optical systems Propellers