International School on Quantum Electronics: Laser Physics and Applications最新文献_第9页

Combined ground-based and satellite remote sensing of atmospheric aerosol and Earth surface in the Antarctic 南极大气气溶胶和地表的地基与卫星联合遥感

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261794

A. Chaikovsky, M. Korol, A. Malinka, E. Zege, I. Katsev, A. Prikhach, S. Denisov, V. Dick, P. Goloub, L. Blarel, L. Chaikovskaya, A. Lapyonok, T. Podvin, N. Denishchik-Nelubina, A. Fedarenka, V. Svidinsky

引用次数: 0

Soliton propagation in isotropic media under the influence of third order of linear dispersion and dispersion of nonlinearity 三阶线性色散和非线性色散影响下的各向同性介质中的孤子传播

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2263442

D. Dakova, A. Dakova, V. Slavchev, P. Staykov, L. Kovachev

引用次数: 0

The ultrafast high-peak power lasers in future biomedical and medical x-ray imaging 未来生物医学和医学x射线成像中的超高速峰值功率激光器

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261795

J. Kieffer, S. Fourmaux, A. Król

引用次数: 5

Avalanche parametric conversion in the initial moment of filamentation 在成丝的初始时刻雪崩参数转换

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2263483

D. Georgieva, L. Kovachev, N. Nedyalkov

引用次数: 1

Nonlinear resonances sign reversal and longitudinal alignment on the resonant levels of 133Cs thin-layer vapour 133Cs薄层蒸汽共振能级上的非线性共振符号反转和纵向对准

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2263622

G. Todorov, V. Polischuk, A. Krasteva, S. Cartaleva, A. Sargsyan, T. Vartanyan

引用次数: 0

Dynamic laser speckle metrology with binarization of speckle patterns 基于散斑图二值化的动态激光散斑测量

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262330

E. Stoykova, D. Nazarova, N. Berberova, A. Gotchev, B. Ivanov, G. Mateev

{"title":"Dynamic laser speckle metrology with binarization of speckle patterns","authors":"E. Stoykova, D. Nazarova, N. Berberova, A. Gotchev, B. Ivanov, G. Mateev","doi":"10.1117/12.2262330","DOIUrl":"https://doi.org/10.1117/12.2262330","url":null,"abstract":"Dynamic laser speckle analysis is non-destructive detection of physical or biological activity through statistical processing of speckle patterns on the surface of diffusely reflecting objects. This method is sensitive to microscopic changes of the surface over time and needs simple optical means. Advances in computers and 2D optical sensors forced development of pointwise algorithms. They rely on acquisition of a temporal sequence of correlated speckle images and generate activity data as a 2D spatial contour map of the estimate of a given statistical parameter. The most widely used pointwise estimates are the intensity-based estimates which compose each map entry from a time sequence of intensity values taken at one and the same pixel in the acquired speckle images. Accuracy of the pointwise approach is strongly affected by the signal-dependent nature of the speckle data when the spread of intensity fluctuations depends on the intensity itself. The latter leads to erroneous activity determination at non-uniform distribution of intensity in the laser beam for the non-normalized estimates. Normalization of the estimates, introduces errors. We propose to apply binarization to the acquired speckle images by comparing the intensity values in the temporal sequence for a given spatial point to the mean intensity value estimated for this point and to evaluate a polar correlation function. Efficiency of this new processing algorithm is checked both by simulation and experiment.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"10226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131046238","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: 1

Estimation of the quantum efficiency of the photodissociation of HbO2 and HbCO HbO2和HbCO光解量子效率的估计

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261829

A. Gisbrecht, S. Mamilov, S. S. Esman, M. Asimov

引用次数: 1

Coherent population trapping in five-level system 五级系统中的相干种群捕获

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2258620

E. Gazazyan

引用次数: 0

Laser paper cleaning: the method of cleaning historical books 激光洗纸:清洗历史书籍的方法

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262426

E. Zekou, I. Tsilikas, E. Chatzitheodoridis, A. Serafetinides

{"title":"Laser paper cleaning: the method of cleaning historical books","authors":"E. Zekou, I. Tsilikas, E. Chatzitheodoridis, A. Serafetinides","doi":"10.1117/12.2262426","DOIUrl":"https://doi.org/10.1117/12.2262426","url":null,"abstract":"Conservation of cultural heritage treasures is the most important issue for transferring knowledge to the public through the next generation of students, academics, and researchers. Although this century is authenticating e-books and information by means of electronic text, still historical manuscripts as content as well as objects are the main original recourses of keeping a record of this transformation. The current work focuses on cleaning paper samples by the application of pulsed light, which is interventional. Experiments carried out using paper samples that are artificially colonized with Ulocladium chartarum. Paper is treated by Nd:YAG laser light. The available wavelength is 1064 nm, at various fluences, repetition rates and number of pulses. Two types of paper are stained with fungi colonies, which grow on substrates of clean paper, as well as on paper with ink text. The first type of paper is Whatman No.1056, which is closer to pure cellulose. The second type of paper is a page of a cultural heritage book published in 1926. Cleaning is performed using laser irradiation, thus defining the damage threshold of each sample. The treatment on paper Watman showed a yellowing, especially on areas with high concentration of fungi. The second sample was more durable to the exposure, performing the best results at higher fluences. Eventually, the paper samples are characterized, with optical microscopy and SEM/EDX analyses, prior to and after cleaning.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122838585","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

Comparative study of electron and laser beam surface alloying 电子束与激光束表面合金化的比较研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262352

S. Valkov, P. Petrov, R. Lazarova

{"title":"Comparative study of electron and laser beam surface alloying","authors":"S. Valkov, P. Petrov, R. Lazarova","doi":"10.1117/12.2262352","DOIUrl":"https://doi.org/10.1117/12.2262352","url":null,"abstract":"High intensity energy fluxes, such as electron beams and laser beams are widely used for surface alloying of metals and alloys. These technologies are able to cause the formation of the so called melt pool where the alloying elements interact each other. It is known that the homogenization of the surface alloy can be explained by intense Marangoni convection, caused by the high temperature gradient in the melt pool. The convection is inversely to the speed of the specimen motion during the alloying process and therefore, the choice of low alloying velocity will reflect on more homogeneous structure of the obtained alloy. In this study, a comparison of the structure and properties of electron and laser beam surface alloying of aluminium with niobium was conducted. The phase composition of the alloyed layers was determined by XRD (X-ray diffraction) with CuKα radiation. The microstructure was studied by SEM (Scanning Electron Microscopy). Chemical analysis was carried out using an EDX electron probe microanalyser. The microhardness of the obtained samples is also measured and compared with respect to the technology of the formation of each surface alloy.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128203940","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