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Electron-Irradiation and Photo-Excitation Darkening and Bleaching of Yb Doped Silica Fibers: Comparison

Optics and Photonics Journal 2011年第4期1卷 155-166页

作者： alexander.v. kir’yanov 不详

We report a comparative experimental study of the attenuation spectra transformations for a series of Yb doped alumino-germano silicate fibers with different contents of Yb3+ dopants, which arise as the result of irradiation either by a beam of high-energy electrons or by resonant (into the 977-nm absorption peak of YbYb3+ ions) optical pumping. The experimental data obtained reveal that in the two circumstances, substantial and complex but different in appearance changes occur within the resonant absorption band of YbYb3+ ions and in the off-resonance background loss of the fibers. Possible mechanisms responsible for these spectral changes are discussed.

关键词： Ytterbium Doped Silica Fibers Photodarkening Electron Irradiation

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Nonlinear Change in Refractive Index and Transmission Coefficient of ZnSe:Fe<sup>2+</sup>at Long-Pulse 2.94-μm Excitation

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Optics and Photonics Journal 2015年第1期5卷 15-27页

作者： alexander.v. kir’yanov Nikolai N. Il’ichev Elmira S. Gulyamova alexander S. Nasibov Peter v. Shapkin Centro de Investigaciones en Optica Loma del Bosque 115 Lomas del Campestre Leon Mexico M.v. Lomonosov Moscow State University Physics Department Vorobyevy Gory 1 Moscow Russia A.M. Prokhorov General Physics Institute (Russ. Acad. Sci.) Ul. Vavilova 38 Moscow Russia P.N. Lebedev Physical Institute (Russ. Acad. Sci.) Ul. Vavilova 38 Moscow Russia

An experimental study of the nonlinear changes in refractive index and transmission coefficient of single-crystal ZnSe:Fe2+, fabricated through the Fe-diffusion method, at long-pulse (~300 ns), sub-mJ, 2.94-mm Z-scan probing is reported. As well, a theoretical model based on the generalized Avizonis-Grotbeck equations is developed and applied for straightforward fitting of the open- and closed-aperture Z-scans, obtained for ZnSe:Fe2+ with different Fe2+ centers concentrations. The modeling results reveal that the contributions in the absorption and refractive index nonlinearities of ZnSe:Fe2+ are “common” resonant-absorption saturation (the minor part) and pulse-induced heating of the samples (the major part), which are strongly dependent on Fe2+ concentrations. Large values of the index change (>~10-3) and partial resonant-absorption bleaching (limited by ~50%), both produced via the thermal effect mainly, are the features of the ZnSe:Fe2+ samples inherent to this type of excitation.

关键词： Nonlinear Refractive index Nonlinear Transmission Z-Scan Technique Thermal lens ZnSe:Fe2+

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Electron-Irradiation and Photo-Excitation Darkening and Bleaching of Yb Doped Silica Fibers: Comparison

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Optics and Photonics Journal（光学与光子学期刊） 2011年第4期

作者： alexander.v. kir’yanov

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Silicon and III-v Solar Cells: From Modus vivendi to Modus Operandi

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Green and Sustainable Chemistry 2017年第3期7卷 217-233页

作者： alexander Buzynin Yury Buzynin vladimir Shengurov vladimir voronkov Ansgar Menke Albert Luk’yanov vitaly Panov Nickolay Baidus Prokhorov General Physics Institute Russian Academy of Sciences Moscow Russia Institute for Physics of Microstructures Russian Academy of Sciences Nizhny Novgorod Russia Lobachevski State University Nizhny Novgorod Russia SunEdison Milano Italy Academy of Science and Education Maico-Mannesmann Hannover Germany Lomonosov Moscow State University Moscow Russia

In the present paper, some novel opportunities for the development of high-efficient Si and III-v-based solar cells are considered: energy-saving environment friendly low-temperature technology of forming p-n junctions in Si (1), elaboration of structurally perfect GaAs/Ge/Si epitaxial substrates (2) and application of protective antireflecting coatings based on cubic zirconia (3). As a result: 1) New technique of forming p-n junctions in silicon has been elaborated. The technique provided easy and comparatively cheap process of production of semiconductor devices such as solar cells. The essence of the technique under the study is comprised in formation p-n junctions in silicon by a change of conductivity in the bulk of the sample occurring as a result of redistribution of the impurities, which already exists in the sample before its processing by ions. It differs from the techniques of diffusion and ion doping where change of conductivity and formation of p-n junction in the sample occur as a result of introduction of atoms of the other dopants from the outside;2) The conditions for synthesis of GaAs/Ge/Si epitaxial substrates with a thin (200 nm) Ge buffer layer featured with (1 - 2) × 105 cm-2 density of the threading dislocation in the GaAs layer. Ge buffer was obtained by chemical vapor deposition with a hot wire and GaAs layer of 1 μm thick was grown by the metal organic chemical vapor deposition. Root mean square surface roughness of GaAs layers of the less than 1 nm and good photoluminescence properties along with their high uniformity were obtained;3) The conditions ensuring the synthesis of uniform functional (buffer, insulating and protective) fianite layers on Si and GaAs substrates by means of magnetron and electron-beam sputtering have been determined. Fianite films have been shown to be suitable for the use as an ideal anti-reflecting material with high protective and anticorrosive properties.

关键词： Solar Cells Green Technologies p-n Junctions Ar Ion-Irradiation Inversion of Conductivity Silicon III-v GaAs on Si Ge Buffer YSZ Antireflection Coatings

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新疆植物区系新资料(英文)

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植物分类学报 2006年第5期44卷 598-603页

作者： Dmitry A. GERMAN alexander I. SHMAKOv 张宪春陈文俐 Sergey v. SMIRNOv 谢磊 Rudolph v. KAMELIN 王健 Altai State University Barnaul 656049 Russia 系统与进化植物学国家重点实验室中国科学院植物研究所 Komarov Botanical Institute St.-Petersburg 197376 Russia 新疆阿勒泰地区林业科学研究所

报道了采自新疆阿尔泰山地区的1个中国新记录属假糖芥属Rhammatophyllum O. E. Schulz, 6个中国新记录种——渐尖岩蕨Woodsia acuminata (Fomin) Sipl.、短命繁缕Stellaria alsinoides Boiss. & Buhse、假糖芥Rh. erysimoides (Kar. & kir.) Al-Shehbaz & O. Appel、克氏鹤虱Lappula krylovii Ovczinnikova, A. I. Pjak & A. L. Ebel、肝色柳穿鱼Linaria hepatica Bunge和佐氏新缬草valerianella szovitsiana Fisch. & Mey.。

关键词：假糖芥属渐尖岩蕨短命繁缕假糖芥克氏鹤虱肝色柳穿鱼佐氏新缬草新记录新疆中国

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