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New Circulation System of Laser Gas Mixtures 新型激光混合气体循环系统
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/alt.1.67
V. Yamshchikov, R. R. Khasaya, V. Khomich, Y. Urlichich
{"title":"New Circulation System of Laser Gas Mixtures","authors":"V. Yamshchikov, R. R. Khasaya, V. Khomich, Y. Urlichich","doi":"10.12684/alt.1.67","DOIUrl":"https://doi.org/10.12684/alt.1.67","url":null,"abstract":"The electrohydrodynamic flow in air, being formed at issue of ions from plasma of the high-frequency barrier discharge is investigated. It is shown that velocity of a flow is proportional to intensity of electric field between the emitter and a collector of ions. All solid-state pulse generator with voltage of U f = 0-12 kV and pulse repetition rate of f = 10-25 kHz is applied to feed the plasma emitter. It is experimentally established that the increase in high voltage and frequency of the plasma emitter feeding leads to increase velocity of a gas flow. The circulation system with a gas flow rate more than 15 L s–1and velocity more than 1.6 m s–1 was proposed for electric-discharge lasers.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124372933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photon Synthesis of Nanometric Films Based on Transitional Metal oxides for Multi-Parameter Sensors 多参数传感器用过渡金属氧化物纳米薄膜的光子合成
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.55
S. Mulenko, A. Luches, A. Caricato, D. Valerini
{"title":"Photon Synthesis of Nanometric Films Based on Transitional Metal oxides for Multi-Parameter Sensors","authors":"S. Mulenko, A. Luches, A. Caricato, D. Valerini","doi":"10.12684/ALT.1.55","DOIUrl":"https://doi.org/10.12684/ALT.1.55","url":null,"abstract":"The reactive pulsed laser deposition (RPLD) based on a KrF laser was used for photon synthesis of nanometric iron and chromium oxides films. RPLD allows controlling the thickness and stoichiometry of deposits with definite band gap. So RPLD was used for synthesizing nanometric iron and chromium oxides films for thermo-photo-chemical sensors. We compared sensing properties of iron and chromium oxides nanometric films deposited on <100>Si substrate by RPLD. These iron and chromium oxides films have semiconductor properties with the band gaps less than 1.0 eV. The largest photosensitivity of iron and chromium oxides films was about 44 Vc/W and 2.5 Vc/W, accordingly, for white light at power density ~ 6x10-3 W/cm2. Vc is “chemical” photo e.m.f.. Maximum value of thermo electromotive force (e.m.f.) coefficient of iron and chromium oxides films was about 1.65 mV/K and 3.5-4.5mV/K, accordingly. Iron oxides films were tested as chemical sensors: the largest sensitivity of NO molecules was at the level of 7x1012 cm-3. Our results showed that nanometric iron and chromium oxides films synthesized by UV photons can be used as up-to-date materials for multi-parameter sensors operating at moderate temperature.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131510699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Submillisecond Er-Laser Pulses on Mechanical Properties of Hard Tooth Tissues 亚毫秒激光脉冲对硬齿组织力学性能的影响
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.62
A. Belikov, K. Shatilova, A. Skrypnik
{"title":"Influence of Submillisecond Er-Laser Pulses on Mechanical Properties of Hard Tooth Tissues","authors":"A. Belikov, K. Shatilova, A. Skrypnik","doi":"10.12684/ALT.1.62","DOIUrl":"https://doi.org/10.12684/ALT.1.62","url":null,"abstract":"In this paper the influence of pulse duration, pulse repetition rate, pulse number (at single point), and pulse energy of YLF: Er laser radiation with λ=2.84 μm on mechanical properties of human hard tooth tissues was studied. It was found that the multi-pulses action of this laser radiation with pulse energy below hard tooth tissues ablation threshold promotes increase in the microhardness of enamel at 25% and microhardness of dentine at 35%. Such research can open new perspectives in esthetic and preventive dentistry.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114414494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Enhancement of the Raman Scattering and the Third-Harmonic Generation in Silicon Nanowires 硅纳米线中拉曼散射的增强和三次谐波的产生
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.81
L. Golovan, K. Bunkov, K. Gonchar, V. Timoshenko, L. A. Osminkina, D. Petrov, V. S. Marshov, V. Sivakov, M. Kulmas
{"title":"Enhancement of the Raman Scattering and the Third-Harmonic Generation in Silicon Nanowires","authors":"L. Golovan, K. Bunkov, K. Gonchar, V. Timoshenko, L. A. Osminkina, D. Petrov, V. S. Marshov, V. Sivakov, M. Kulmas","doi":"10.12684/ALT.1.81","DOIUrl":"https://doi.org/10.12684/ALT.1.81","url":null,"abstract":"We studied features of Raman scattering and the third-harmonic generation in silicon nanowire (SiNW) ensembles formed by means of chemical etching of crystalline silicon (c-Si) wafers with preliminary deposited silver nanoparticles in hydrofluoric acid. The c-Si wafers of different crystallographic orientations and doping levels were used, which results in variations of the formed nanostructure size and degree of order. For the excitation at 1064 nm the ratio of Raman scattering signals for SiNWs and those for initial c-Si wafer ranges from 2 to 5, whereas for shorter wavelengths the ratio increases for more ordered arrays of SiNWs of greater diameter and decreases for less ordered SiNW structures. The TH signals in SiNW ensembles demonstrate both fall and one- or two-orders-of-magnitude rise in comparison with c-Si depending on the structure of the SiNW ensemble. The obtained results are explained by the effect of partial light localization in SiNW ensembles.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126901137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Laser Microprinting of Transparent and Weakly Absorbing Solutions 透明弱吸收溶液的激光微缩印刷
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.51
P. Serra, A. Patrascioiu, A. Palla-Papavlu, J. Fernández-Pradas, J. Morenza
{"title":"Laser Microprinting of Transparent and Weakly Absorbing Solutions","authors":"P. Serra, A. Patrascioiu, A. Palla-Papavlu, J. Fernández-Pradas, J. Morenza","doi":"10.12684/ALT.1.51","DOIUrl":"https://doi.org/10.12684/ALT.1.51","url":null,"abstract":"A laser-based technique for printing transparent andweakly absorbing liquids is developed. Its principleof operation relies in the tight focusing of shortlaser pulses inside the liquid and close to its freesurface, in such a way that the laser radiation isabsorbed in a tiny volume around the beam waist,with practically no absorption in any other locationalong the beam path. If the absorbed energyovercomes the optical breakdown threshold, acavitation bubble is generated, and its expansionresults in the propulsion of a small fraction of liquidwhich can be collected on a substrate, leading to theprinting of a microdroplet for each laser pulse. Thetechnique does not require the preparation of theliquid in thin film form, and its forward mode ofoperation imposes no restriction concerning theoptical properties of the substrate. We demonstratethat the technique is capable of printingmicrodroplets with good resolution, reproducibilityand control, and analyze the influence of the mainprocess parameters. The mechanisms of liquidprinting are also investigated: time-resolvedimaging provides a clear picture of the dynamics ofliquid transfer which allows understanding the mainfeatures observed in the printed droplets.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121666105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Supercontinuum Generation over 2 µm 超连续统一代超过2µm
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.74
V. Kamynin, A. Kurkov, Y. Sadovnikova, V. Tsvetkov
{"title":"Supercontinuum Generation over 2 µm","authors":"V. Kamynin, A. Kurkov, Y. Sadovnikova, V. Tsvetkov","doi":"10.12684/ALT.1.74","DOIUrl":"https://doi.org/10.12684/ALT.1.74","url":null,"abstract":"Effective supercontinuum generation in fiber mediain spectral range over 2 μm was experimentallydemonstrated. Supercontinuum generation wasobserved in passive optical fibers. Maximumspectral broadening was obtained in germaniumdopedfibers with longest wavelength near 2.7 μm.To provide high spectral density we used opticalfiber amplifiers. Thus supercontinuum generationwas obtained in holmium optical fiber amplifiersmedium with spectral density 10 W/nm, in therange from 2 to 2.5 μm. In thulium fiber amplifiersobserved amplification not only in conventionalrange near 1.8 μm, but in spectral range from 2.3 to2.5 μm, that corresponds to 3H4→ 3H5 opticaltransition possibility in thulium-doped opticalfibers.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122736351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nanostructure Formation on Solid Surfaces melted by Laser Pulse 激光脉冲熔化固体表面纳米结构的形成
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.46
V. Khomich, S. Mikolutskiy, V. Shmakov, V. Tokarev, Y. Urlichich, V. Yamschikov
{"title":"Nanostructure Formation on Solid Surfaces melted by Laser Pulse","authors":"V. Khomich, S. Mikolutskiy, V. Shmakov, V. Tokarev, Y. Urlichich, V. Yamschikov","doi":"10.12684/ALT.1.46","DOIUrl":"https://doi.org/10.12684/ALT.1.46","url":null,"abstract":"The paper describes the model of nanostructureformation on solid surface by nanosecond laserpulses melting the material. Stefan problem withcorresponding boundary conditions is solved incombination with nucleation theory. It is found thattypical size of surface nanostructure formeddepends on energy and duration of laser pulse. Forcomparison of theoretic and experimental resultsvarious industry material (germanium, titanium,zirconia dioxide) pieces irradiated by ArF-laser areshown.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122773349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of the Methods of Control of Radiation Structure of 辐射结构控制方法的发展
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.88
E. Orlova, P. Visser, X. Gu, J. Hovenier, Jiansong Gao, T. Klapwijk
{"title":"Development of the Methods of Control of Radiation Structure of","authors":"E. Orlova, P. Visser, X. Gu, J. Hovenier, Jiansong Gao, T. Klapwijk","doi":"10.12684/ALT.1.88","DOIUrl":"https://doi.org/10.12684/ALT.1.88","url":null,"abstract":"Specific features of radiation structure of terahertz quantum  cascade  lasers  are determined  by wire geometry of their waveguides with small and sub-wavelength transverse dimensions  and  the  length much larger than the wavelength. Here we present an  overview  of  the  results  of  beam  profile investigations and of the methods proposed for the control of radiation structure of such lasers.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"11 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121501585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PPLN Crystals for Nonlinear-optical Detection of Terahertz Wave Radiation 用于太赫兹波辐射非线性光学探测的PPLN晶体
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.87
V. V. Kornienko, A. N. Tuchak, P. V. Yakunin, I. Naumova, G. Kitaeva
{"title":"PPLN Crystals for Nonlinear-optical Detection of Terahertz Wave Radiation","authors":"V. V. Kornienko, A. N. Tuchak, P. V. Yakunin, I. Naumova, G. Kitaeva","doi":"10.12684/ALT.1.87","DOIUrl":"https://doi.org/10.12684/ALT.1.87","url":null,"abstract":"Periodically  poled  lithium  niobate  crystals  can  be utilized  in  nonlinear-optical  spectral  brightness detectors  of  terahertz  range.  In  this  paper characteristics  of  detectors  were  determined  by analyzing spectra of spontaneous parametric down- and up-conversion in these crystals.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121709194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Light Scattering Microscopy for Tumor Cell Recognition 光散射显微镜用于肿瘤细胞识别
ALT Proceedings Pub Date : 2012-11-01 DOI: 10.12684/ALT.1.59
V. Richter, H. Schneckenburger
{"title":"Light Scattering Microscopy for Tumor Cell Recognition","authors":"V. Richter, H. Schneckenburger","doi":"10.12684/ALT.1.59","DOIUrl":"https://doi.org/10.12684/ALT.1.59","url":null,"abstract":"Light scattering microscopy is suggested to providesome insight into cell architecture and to giveinformation on cell malignancy or morphologicalchanges upon necrosis or apoptosis. In the presentpaper a microscope setup for scattering experimentswith high angular resolution is reported, and firstdata obtained from test models (polystyrene beads),cell monolayers and 3-dimensional cell spheroidsare reported. Data are compared with simulationsbased on Mie scattering and discussed in view oftheir possible use for tumor cell recognition withintissue samples. The discussion includes presentlimitations due to spatial resolution or inhomogeneous illumination and suggests possibilities ofimprovement.","PeriodicalId":103215,"journal":{"name":"ALT Proceedings","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133793757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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