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measurement of the Optical Coherence of a Femtosecond Pulsed Laser by Shearing Interferometry with a Double-Frequency Grating

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Chinese Physics Letters 1998年第1期15卷 32-34页

作者： mING Hai QIAN Jiang-yuan XIE Jian-ping A.B.fedotov X.Xiao m.m.T.Loy Department of Physics University of Science and Technology of ChinaHefei 230026 Department of Physics Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongChina

Shearing interferometry of an ion-etched holographic double-frequency grating is used to measure the optical coherence of femtosecond pulsed *** experimental results show that the optical coherence of the femtosecond light beam is not only related to the spectral width and size of the light source but is also related to the pulse duration and mode-locked laser *** results of theoretical analysis and numerical calculation are also *** of this research is also discussed.

关键词： Femto holographic interferometry

掺Nd^(3+)双包层光纤的泵浦波长及其光谱特性的研究

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科学通报 1997年第4期42卷 365-368页

作者：明海杨宝董小鹏 A.fedotov XudongXiao m.m.T.Loy 中国科学技术大学物理系合肥230026 香港科技大学物理系

掺Nd^(3+)双包层光纤是近年来研制出的一种新型光纤,跟单包层光纤相比,它具有数值孔径大、接收面积大等优点,能直接用大功率半导体阵列激光器泵浦,而且机械调整方便。掺Nd^(3+)双包层光纤可以用来做大功率光纤激光器、高增益的光纤放大... 详细信息

掺Nd^(3+)双包层光纤是近年来研制出的一种新型光纤,跟单包层光纤相比,它具有数值孔径大、接收面积大等优点,能直接用大功率半导体阵列激光器泵浦,而且机械调整方便。掺Nd^(3+)双包层光纤可以用来做大功率光纤激光器、高增益的光纤放大器和高功率的放大自发辐射源,在光纤通信、传感、医疗等领域具重要的应用前景。国外一些掺Nd^(3+)双包层光纤的研究工作,并未对半导体阵列激光泵浦波长进行仔细分析,大多采用808nm左右半导体阵列激光器泵浦。不同的光纤器件为了获得最佳的泵浦效率,要选择不同的泵浦波长。本文利用钛宝石激光器波长的宽调谐特性,对国产掺Nd^(3+)双包层光纤的泵浦波长和光谱特性进行了研究,发现907和1080nm光发射的最佳泵浦波长分别为833和835nm。若用808nm波长的激光泵浦,会产生很强的激发态吸收,因此在红外波段的光发射的效率较低,但这对上转换的光发射却很有利。同时,还发现用532 nm波长激光泵浦时,由于光纤外包层的光化学反应,580nm处的荧光峰强度随时间衰减。研究掺Nd^(3+)双包层光纤的泵浦波长及其光谱特性,对双包层光纤及其器件的设计和研制有重要的实际意义。

关键词：双包层光纤泵浦波长光谱特性钕离子光纤

Eco-legal and economic aspects of developing malomorsky fishing area of Lake Baikal

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Aquaculture and Fisheries 2021年第5期6卷 530-534页

作者： Alexander P.Sukhodolov Andrei P.fedotov mikhail m.makarov Alina V.Kolesnikova Yakov A.Sukhodolov Polina G.Sorokina Baikal State University IrkutskRussia Limnological Institute of the Siberian Branch of the Russian Academy of Sciences IrkutskRussia Institute of Economic Studies of the Far East Branch of the Russian Academy of Sciences KhabarovskRussia

Lake Baikal is the largest freshwater reservoir of our planet and a unique natural site included in the UNESCO World Heritage ***,Baikal is not only Russia’s largest freshwater fishing ***-scale commercial fishing started here at the beginning of the 19th century and,with small breaks caused by bans imposed on commercial fishing due to depletion of valuable commercial fish species stock,continued until October 2017,when once again restrictions in the fishing industry were *** of the reasons for this was the growth of illegal,unreported and unregulated(IUU)fishing(hereinafter also referred to as“illegal fishing”)which led to depletion of the stock of ***,these restrictions neither eliminated extensive illegal fishing,nor solved the problem of rapid fish stock rebuilding in the unique *** methods of mathematical analysis and modeling this article examines factors facilitating breach of law in the fishing industry and illegal fishing for Baikal *** article provides a brief characteristic of the Baikal oldest malomorsky fishing area as well as an eco-economic assessment of the possibility to rebuild the fish stock within this water zone taking into account the increasing tourist flow in the Baikal region.

关键词： Baikal Baikal natural territory Baikal omul maloye more mathematical modeling

Spectrum characteristics and pump wavelengths of Nd_(3+) -doped double-clad fiber

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Chinese Science Bulletin 1997年第11期42卷 897-900页

作者： mING Hai, YANG Bao, DONG Xiaopeng, A. fedotov, Xudong Xiao and m. m. T. Loy1. Department of Physics, University of Science and Technology of China, Hefei 230026, China 2. Department of Physics, University of Science and Technology of Hong Kong, Hong Kong, China Department of Physics University of Science and Technology of China Hefei China Department of Physics University of Science and Technology of Hong Kong Hong Kong China

Nd3+ -doped double-clad fiber is a new type of fiber that has large *** large receivingarea compared with single-clad rare-earth-doped *** Nd3+-doped double-clad fiberpumped directly by laser-diode arrays can be manufactured into high-power fiber lasers,high-power superfluorescence sources and high-gain fiber amplifiers,and they will be applied

关键词： double-clad fiber optimum pump wavelength optical spectrum.

Structural modification of titanium surface by octacalcium phosphate via Pulsed Laser Deposition and chemical treatment

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Bioactive materials 2017年第2期2卷 101-107页

作者： I.V.Smirnov J.V.Rau m.Fosca A.De Bonis A.Latini R.Teghil V.I.Kalita A.Yu.fedotov S.V.Gudkov A.E.Baranchikov V.S.Komlev A.Abaikov institute of metallurgy and materials science russian academy of sciencesleninsky prospect 49119334 moscowrussia istituto di struttura della materia consiglio nazionale delle ricerchevia del fosso del cavaliere 10000133 romeitaly dipartimento di scienze universita della basilicataviale dell'ateneo lucano1085100 potenzaitaly universita di roma“la sapienza” dipartimento di chimicapiazzale aldo moro500185 romeitaly lobachevsky state university gagarin av5.23603950 nizhny novgorodrussia prokhorov institute of general physics russian academy of sciencesvavilova street38119991 moscowrussia institute of theoretical and experimental biophysics russian academy of sciencesinstitutskaya street3pushchino142290 moscow regionrussia kurnakov institute of general and inorganic chemistry of the russian academy of sciences leninsky prospect 31119991 moscowrussia

In the present study, the Pulsed Laser Deposition (PLD) technique was applied to coat titanium for orthopaedicand dental implant applications. Calcium carbonate (CC) was used as starting coating *** deposited CC films were transformed into octacalcium phosphate (OCP) by chemical treatments. Theresults of X-ray diffraction (XRD), Raman, Fourier Transform Infrared Spectroscopy (FTIR) and scanningelectron microscopy (SEm) studies revealed that the final OCP thin films are formed on the titaniumsurface. Human myofibroblasts from peripheral vessels and the primary bone marrow mesenchymalstromal cells (BmmSs) were cultured on the investigated materials. It was shown that all the investigatedsamples had no short-term toxic effects on cells. The rate of division of myofibroblast cells growing onthe surface and saturated BmmSs concentration for the OCP coating were about two times faster than ofcells growing on the CC films.

关键词： Titanium implants Coating Pulsed Laser Deposition Calcium carbonate Octacalcium phosphate

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基于平面超材料的Fano谐振可调谐研究

物理学报 2012年第15期61卷 197-203页

作者：刘冉史金辉 E.Plum V.A. fedotov N.I. Zheludev E.Plum 哈尔滨工程大学理学院哈尔滨150001 Optoelectronics Research Center University of Southampton Southampton SO17 1B J UK 东南大学毫米波国家重点实验室南京210096

基于两段相同金属分裂环谐振器构成的单层结构,从理论及实验方面研究了平面超材料的可调谐Fano谐振.实验测量了平面超材料对TE和Tm入射波的电磁响应,利用电磁波的入射角度控制Fano谐振的强度,实现了谐振的开关特性,谐振频率红移可达到2... 详细信息

基于两段相同金属分裂环谐振器构成的单层结构,从理论及实验方面研究了平面超材料的可调谐Fano谐振.实验测量了平面超材料对TE和Tm入射波的电磁响应,利用电磁波的入射角度控制Fano谐振的强度,实现了谐振的开关特性,谐振频率红移可达到21%.基于有限元法给出了平面超材料的场分布,强的正常色散表明平面超材料的电磁响应可类比经典电磁诱导透明现象,仿真与实验结果相符合.对称结构超材料Fano谐振的开/关特性为超材料性能的可调谐控制提供了有效途径.

关键词：电磁超材料束缚模 Fano谐振电磁诱导透明

Free-surface velocity measurements of opaque materials in laser-driven shock-wave experiments using photonic Doppler velocimetry

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matter and Radiation at Extremes 2021年第4期6卷 43-50页

作者： N.Nissim E.Greenberg m.Werdiger Y.Horowitz L.Bakshi Y.Ferber B.Glam A.fedotov-Gefen L.Perelmutter S.Eliezer Applied Physics Division Soreq NRCYavneIsrael Note:This paper is part of the Special Issue on Matter in Extreme States Created by Laser.

We present a novel photonic Doppler velocimetry(PDV)design for laser-driven shock-wave *** PDV design is intended to provide the capability of measuring the free-surface velocity of shocked opaque materials in the terapascal *** present measurements of the free-surface velocity of gold for as long as∼2 ns from the shock breakout,at pressures of up to∼7 mbar and a free-surface velocity of 7.3 km/s with an error of∼1.5%.Such laboratory pressure conditions are achieved predominantly at high-intensity laser facilities where the only velocity diagnostic is usually line-imaging velocity interferometry for any ***,that diagnostic is limited by the lower dynamic range of the streak camera(at a temporal resolution relevant to laser shock experiments)to measure the free-surface velocity of opaque materials up to pressures of only∼1 *** expect the proposed PDV design to allow the free-surface velocity of opaque materials to be measured at much higher pressures.

关键词： shock wave interferometry

Basic Spectroscopy Performance of Nd3+ and Rhodamine B Doped Polymer Fibers

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Chinese Journal of Lasers 1999年第5期8卷 3-5页

作者： H. ming Z. C. Liang K. Liu Q. Zhang(Department of Physics, Department of materials Science and EngineeringUniversity of Science and Technology of China, Hefei 230026, China)A. B. fedotov X. D. Xiao m. m. T. Loy(Department of Physics, Hong Kong Univer 中国科学技术大学物理系安徽合肥 230026 中国科学技术大学物理系安徽合肥中国科学技术大学材料科学与工程系安徽合肥香港科技大学物理系香港

The spectroscopy properties of Nd3+ doped polymer fiber with 532 nm pumping radiation is studied. It is found that the emission peak near 380 nm is attributed the transition from 2 G7/2 and4 G5/5/2 to ground level 4I9/2, and the florescence intensity of Nd3+ doped polymer fiber with 70 ppm concentration and 650 μm cord diameter increases as the fiber is shortened from 89 cm to 15cm and decreases again for further shortening to 8cm. Both the advantages and disadvantages of Nd3+ doped polymer fiber compared with Rhodamine B doped polymerfiber are discussed.

关键词： polymer fiber speetroscopy Nd3+ doped Rhodumine B doped

Upconversion in Highly Doped Er3+-Yb 3+ Fiber Pumped by Ti∶Sapphire Laser at 800 nm

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Chinese Journal of Lasers 2000年第1期 2-8页

作者： XU Lixing mING Hai XIONG Yang ZHU Bing (Structure Research Laboralory, Department of Physics, University of Science and Technology of China, Hefei 230026, China)A. B. fedotov m. m. T. Loy X. Xiao (Department of Physics, Hong Kong University of Sc

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关键词： frequency up conversion Er 3+ Yb 3+ doped fiber Ti∶Sapphire laser