International Conference on Coherent and Nonlinear Optics最新文献_第7页

Reversible and irreversible structural transformations of nanocomponents of molecular layers by resonance photoexcitation or heating 共振光激发或加热下分子层纳米组分的可逆和不可逆结构转变

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.879804

E. Kaliteevskaya, V. Krutyakova, T. K. Razumova, A. Starovoytov

引用次数: 0

Evaluation of oil spills by laser induced fluorescence spectra 用激光诱导荧光光谱评价溢油

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.880750

Andrei Borissovitch Utkin, A. Lavrov, R. Vilar

引用次数: 21

Reversible nonlinear absorption in nanoporous glass polymer composite doped with functional dyes: experiment and background model 掺杂功能染料纳米多孔玻璃聚合物复合材料的可逆非线性吸收:实验与背景模型

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881797

L. M. Koldunov, M. Koldunov, A. Petuhov, A. V. Sizuhin

引用次数: 2

Femtosecond laser-induced periodic surface structures: recent approaches to explain their sub-wavelength periodicities 飞秒激光诱导的周期性表面结构:解释其亚波长周期性的最新方法

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.879813

J. Bonse, A. Rosenfeld, J. Krüger

{"title":"Femtosecond laser-induced periodic surface structures: recent approaches to explain their sub-wavelength periodicities","authors":"J. Bonse, A. Rosenfeld, J. Krüger","doi":"10.1117/12.879813","DOIUrl":"https://doi.org/10.1117/12.879813","url":null,"abstract":"The formation of laser-induced periodic surface structures (LIPSS) upon irradiation of semiconductors and dielectrics by linearly polarized high-intensity Ti:sapphire fs-laser pulses (τ ~100 fs, λ ~800 nm) is studied experimentally and theoretically. In the experiments, two different types of LIPSS exhibiting very different spatial periods are observed (socalled LSFL - low spatial frequency LIPSS, and HSFL - high spatial frequency LIPSS), both having a different dependence on the incident laser fluence and pulse number per spot. The experimental results are analyzed by means of a new theoretical approach, which combines the generally accepted LIPSS theory of J. E. Sipe and co-workers [Phys. Rev. B 27, 1141-1154 (1983)] with a Drude model, in order to account for transient changes of the optical properties of the irradiated materials. The joint Sipe-Drude model is capable of explaining numerous aspects of fs-LIPSS formation, i.e., the orientation of the LIPSS, their fluence dependence as well as their spatial periods. The latter aspect is specifically demonstrated for silicon crystals, which show experimental LSFL periods Λ somewhat smaller than λ. This behaviour is caused by the excitation of surface plasmon polaritons, SPP, (once the initially semiconducting material turns to a metallic state upon formation of a dense free-electron-plasma in the material) and the subsequent interference between its electrical fields with that of the incident laser beam, resulting in a spatially modulated energy deposition at the surface. Upon multi-pulse irradiation, a feedback mechanism, caused by the redshift of the resonance in a grating-assisted SPP excitation, is further reducing the LSFL spatial periods. The SPP-based mechanism of LSFL successfully explains the remarkably large range of LSFL periods between ~0.6 λ and λ.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115445017","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: 15

Pump-probe experiments with Ce3++Yb3+:KY3F10 and Ce3++Yb3+:CaF2 crystals Ce3++Yb3+:KY3F10和Ce3++Yb3+:CaF2晶体的泵浦探针实验

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881867

S. A. Kirysheva, A. Nizamutdinov, V. Semashko, A. Naumov, S. Korableva

{"title":"Pump-probe experiments with Ce3++Yb3+:KY3F10 and Ce3++Yb3+:CaF2 crystals","authors":"S. A. Kirysheva, A. Nizamutdinov, V. Semashko, A. Naumov, S. Korableva","doi":"10.1117/12.881867","DOIUrl":"https://doi.org/10.1117/12.881867","url":null,"abstract":"Here we report on pump-probe studies of KY3F10 and CaF2 doped with Ce3+ and Yb3+ ions. The crystals Ce3+:KY3F10 and Ce3+:CaF2 show attractive spectral characteristics for tunable UV lasers application but have poor photochemical stability. Their properties under intense UV pumping are affected by excited state absorption and color centers formation. This work was aimed at dynamic processes investigation induced by laser radiation of UV spectral range in KY3F10 and CaF2 doped with Ce3+ and Yb3+ ions. Optical gain was observed on CaF2:3++Yb3+ in the range 325-335 nm for the first time. It proves Yb3+ ions coactivation antisolarant effect elaborated by us earlier. It is shown that in investigated crystals under a pump radiation, resonant to 4f-5d Ce3+ ions transitions several types of color centers (CC) are formed. Set of these CC types are determine the absorption at expected stimulated emission spectral range and magnitude of the induced loses is dependent on many factors. As a result of competition between CC formation, free charges recombination and CC photodestruction this balance can be shifted towards either rising or dropping losses at 5d-4f Ce3+ ions luminescence spectral range.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132064252","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

Optical properties of the two-dimensional magnetoexcitons under the influence of the Rashba spin-orbit coupling 二维磁激子在Rashba自旋-轨道耦合影响下的光学性质

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.882290

T. Hakioǧlu, M. A. Liberman, S. Moskalenko, I. V. Podlesny

{"title":"Optical properties of the two-dimensional magnetoexcitons under the influence of the Rashba spin-orbit coupling","authors":"T. Hakioǧlu, M. A. Liberman, S. Moskalenko, I. V. Podlesny","doi":"10.1117/12.882290","DOIUrl":"https://doi.org/10.1117/12.882290","url":null,"abstract":"The influence of the Rashba spin-orbit coupling on the two-dimensional (2D) electrons and holes in a strong perpendicular magnetic field leads to different results of the Landau quantization in different spin projections. In Landau gauge the unidimensional wave vector describing the free motion in one in-plane direction is the same for both spin projections, whereas the numbers of the Landau quantization levels are different. For electron in s-type conduction band they differ by one, as was established earlier by Rashba1, whereas for heavy holes in p-type valence band influenced by the 2D symmetry of the layer they differ by three. There are two lowest spin-splitted Landau levels for electrons as well as two lowest for holes. They give rise to four lowest energy levels of the 2D magnetoexcitons. It is shown that two of them are dipole-active in band-to-band quantum transitions, one is quadrupole-active and the fourth is forbidden. The optical orientation under the influence of the circularly polarized light leads to optical alignment of the magnetoexcitons with different orbital momentum projections on the direction of the external magnetic field.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"244 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131045498","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

Susceptibility of representative dental pathogens to inactivation by the PDT with water-soluble photosensitizers 代表性口腔病原体对水溶性光敏剂PDT灭活的敏感性

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881011

I. Angelov, V. Mantareva, V. Kussovski, D. Worle, H. Kisov, M. Belcheva, T. Georgieva, S. Dimitrov

{"title":"Susceptibility of representative dental pathogens to inactivation by the PDT with water-soluble photosensitizers","authors":"I. Angelov, V. Mantareva, V. Kussovski, D. Worle, H. Kisov, M. Belcheva, T. Georgieva, S. Dimitrov","doi":"10.1117/12.881011","DOIUrl":"https://doi.org/10.1117/12.881011","url":null,"abstract":"In the recent decade the applications of photodynamic therapy (PDT) rapidly increase in several topics and one of areas where the PDT in the future will be play significant role is dentistry. The different photosensitizing complexes with a good water solubility and with absorption with an intensive maximum in the red region (630-690 nm), which makes them suitable for photodynamic treatments, were investigated. The photochemical properties of complexes for singlet oxygen generation were investigated and were shown relations between uptake levels and light intensity to achieve increase in photodynamic efficacy. Photodynamic efficacy against fungi Candida albicans and bacteria's E. faecalis, MRSA and S. Mutans in planktonic media was evaluated. The high photodynamic efficacy was shown for SiPc at very low concentrations (0.9 μM) and light doses of 50 J cm-2 by intensity of light 60 mW cm-2. The photodynamic response for E. faecalis, MRSA and S. Mutans, after treatments with different photosensitizers show strong dependence on concentrations of photsensitzers and micro organisms. The level of inactivation of the pathogen bacteria's from 1-2 degree of initial concentration up to full inactivation was observed. The studied complexes were compared to the recently studied Methylene blue, Haematoporphyrine and tetra-methylpirydiloxy Zn(II)- phthalocyanines and experimental results show that some of them have a good potential for inactivation of representative pathogenic bacterial strains. Experimental results also indicate that photodynamic therapy appears an effective method for inactivation of oral pathogenic bacterias and fungi.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123270646","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: 4

High sensitivity rotation measurements with a mid-size laser gyroscope 用中型激光陀螺仪进行高灵敏度旋转测量

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.880971

J. Belfi, N. Beverini, F. Bosi, G. Carelli, A. D. Di Virgilio, E. Maccioni, R. Passaquieti, F. Stefani

引用次数: 1

Revealing some virus infections by lymphocyte laser scattering 淋巴细胞激光散射揭示某些病毒感染

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881925

G. I. Ruban, V. Berdnik, Dmitry V. Marinitch, N. Goncharova, V. Loiko

引用次数: 0

On nonlinear reflection of optical pulse from low-frequency few cycle pulse 低频少周脉冲对光脉冲的非线性反射

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.880954

A. Bugay, S. Sazonov, A. P. Sukhorukov

引用次数: 2