International School on Quantum Electronics: Laser Physics and Applications最新文献_第6页

Ablation of graphite in water by Nd:YAG laser Nd:YAG激光烧蚀水中石墨的研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2019-01-29 DOI: 10.1117/12.2516368

I. Balchev, A. Nikolov, N. Stankova, I. Avramova, E. Valcheva, S. Russev, D. Karashanova, I. Kostadinov, J. Mladenoff, S. Kolev, T. Milenov

引用次数: 1

Optical response of azopolymer (PAZO) layers doped with TiO2 nanoparticles 掺杂TiO2纳米粒子的偶氮聚合物(PAZO)层的光学响应

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2019-01-29 DOI: 10.1117/12.2516751

N. Berberova, P. Sharlandjiev, D. Nazarova, L. Nedelchev

{"title":"Optical response of azopolymer (PAZO) layers doped with TiO2 nanoparticles","authors":"N. Berberova, P. Sharlandjiev, D. Nazarova, L. Nedelchev","doi":"10.1117/12.2516751","DOIUrl":"https://doi.org/10.1117/12.2516751","url":null,"abstract":"In this paper we analyze the optical response of azopolymer (poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido] -1,2-ethan-ediyl, sodium salt]), shortly denoted as PAZO. The photoinduced birefringence of this material has a potential for polarization holographic recording. We consider thin PAZO layers with embedded TiO2 spherical particles. This is a numeric simulation motivated by the search of photoinduced birefringence enhancement in azopolymer layers. The scattering of a single particle in the dye-polymer matrix is calculated using the exact vector Maxwell equations. The particles are treated as ensemble of non-aggregated spheres with normal distribution of sizes, characterized by the mean radius /4. Multiple scattering by individual particles is ignored. The refractive index of the PAZO matrix at 442 nm has a complex value (due to absorption) as we have determined it from experimental spectrophotometric data. The 442 nm wavelength is commonly used for recording polarization holographic gratings in azopolymer materials. Embedded TiO2 spheres with mean radius from 10 to 80 nm are considered. The angular dependences of all the scattering matrix elements, which describe the optical response of the composite layers, are estimated.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133544707","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

Effect of tissue temperature and radiation parameters on the quantum efficiency of photodissociation of oxyhemoglobin in cutaneous blood vessels 组织温度和辐射参数对皮肤血管中氧合血红蛋白光解量子效率的影响

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2019-01-29 DOI: 10.1117/12.2516163

A. Gisbrecht, S. Mamilov, S. S. Esman

引用次数: 0

Search for deviations from the ideal Maxwell-Boltzmann distribution for a gas at an interface 寻找气体在界面处与理想麦克斯韦-玻尔兹曼分布的偏差

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2018-10-11 DOI: 10.1117/12.2519719

P. Todorov, J. C. de Aquino Carvalho, I. Maurin, A. Laliotis, D. Bloch

{"title":"Search for deviations from the ideal Maxwell-Boltzmann distribution for a gas at an interface","authors":"P. Todorov, J. C. de Aquino Carvalho, I. Maurin, A. Laliotis, D. Bloch","doi":"10.1117/12.2519719","DOIUrl":"https://doi.org/10.1117/12.2519719","url":null,"abstract":"The isotropic Maxwell-Boltzmann (M-B) velocity distribution is the accepted standard for a gas at thermal equilibrium, with the Doppler width considered to deliver a very precise measurement of the temperature. Nevertheless, the physical nature of the surface, and the atom-surface interaction, in its long-range (van der Waals type) regime as well as in its short-range regime leading to adsorption/desorption mechanisms, are far from the ideal situation describing the foundation of gas kinetics. Through the development of vapor spectroscopy at an interface, a high sensitivity to atoms flying nearly parallel to the gas interface is obtained, and deviations to M-B distribution could have observable effects, even affecting the ultimate limits to resolution. We report here on the development of an experiment involving a dedicated set-up of spatially-separated pump-probe experiment in a narrow cell. A first series of investigation could not evidence a deviation for Cs atom velocities at a nearly grazing incidence (typically 1.5 -5°). We discuss various technical improvements to increase the sensitivity to atoms flying parallel to the surface, along with specific spectroscopic information that may be collected. Alternately, the comparison of standard selective reflection spectroscopy with simultaneous volume spectroscopy may be a source of complementary information. At last, we discuss how the Boltzmann energy distribution, among molecular or atomic levels, may become sensitive to specific thermal exchanges at the surface, in an equilibrium situation.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116495781","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

Morphological characterization of chitosan biopolymer thin films modified via fs irradiation and its potential application as functional surfaces in regenerative medicine 辐照改性壳聚糖生物聚合物薄膜的形态表征及其在再生医学功能表面的潜在应用

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262679

A. Daskalova, I. Bliznakova, A. Trifonov, I. Buchvarov, C. R. Nathala, W. Husinsky

{"title":"Morphological characterization of chitosan biopolymer thin films modified via fs irradiation and its potential application as functional surfaces in regenerative medicine","authors":"A. Daskalova, I. Bliznakova, A. Trifonov, I. Buchvarov, C. R. Nathala, W. Husinsky","doi":"10.1117/12.2262679","DOIUrl":"https://doi.org/10.1117/12.2262679","url":null,"abstract":"The creation of microporous surface modification of chitosan thin films irradiated by ultrashort laser pulses are studied. For this purpose, chitosan substrates were treated by using an amplified Ti:sapphire laser system at 800 nm central wavelength with 30 fs and 150 fs pulse duration and repetition rate 1 kHz and 50 Hz, respectively. Formation of surface modifications for both cases (30 fs and 150 fs) after femtosecond laser irradiation were observed. The threshold values for single-pulse (N = 1) and multi-pulse (N > 1) modification were evaluated by studying the linear relationship between the squared crater diameter D2 and the logarithm of the laser fluence (F) for N = 1, 2, 5, 10, 20, 30 and 50 number of laser pulses. The coefficient of incubation ξ, a major parameter in the process of surface modification and ablation of materials also was calculated for multi - pulse fluence threshold estimation by power - law relationship Fth (N) = Fth (1) Nξ-1, where N is the number of applied laser pulses. The surface properties of chitosan based thin films before and after femtosecond laser irradiation were investigated. The aim of this work is to determine the optimal morphological characteristics of the created structures for tailoring of protein adsorption and cell behavior.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"8 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120854988","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

Synthesis and characterization of rare earth doped ternary chalcogenide semiconductors: effective electro-luminescence and laser materials 稀土掺杂三元硫系半导体的合成与表征:有效的电致发光和激光材料

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2260889

A. Pashayev, B. G. Tagiev, O. Tagiev, I. Huseynov, K. Allahverdiyev

引用次数: 2

Investigation of laser cleaning procedures for the restoration of burnt paintings 烧伤绘画修复激光清洗程序的研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262493

N. Antonopoulou-Athera, E. Profitis, E. Chatzitheodoridis, A. Terlixi, M. Doulgerides, A. Serafetinides

{"title":"Investigation of laser cleaning procedures for the restoration of burnt paintings","authors":"N. Antonopoulou-Athera, E. Profitis, E. Chatzitheodoridis, A. Terlixi, M. Doulgerides, A. Serafetinides","doi":"10.1117/12.2262493","DOIUrl":"https://doi.org/10.1117/12.2262493","url":null,"abstract":"The present work aims to further investigate the effects of laser cleaning of the burnt Parthenis' paintings, and to the development of a restoration procedure with the use of pulsed lasers, in combination with several characterisation methods. The evaluation of different types of laser, such as Nd:YAG laser with five harmonics, Er:YAG laser, and CO2 using various fluences on different areas of the painting has been already performed and published1. In this work, and taking into account the previous results as well as the respective literature2, 3, untreated parts of the burnt paintings were cleaned with the optimum combination of laser parameters. The cleaning process was thoroughly examined with X-ray diffraction (XRD). In addition, the stratified layers of the paint were determined giving valuable information about the inner layers of the paintings. In the previous published work1, the optimum cleaning parameters have been assessed with the assumption that one single laser will be used to clean the entire surface of both burnt paintings. Nevertheless, thickness differences of the layers of the applied paint lead to the necessity of investigating the use of multiple lasers and of different parameters according to the required degree of cleaning. Therefore, restoration procedures based on multiple lasers or on a single laser, with varying parameters, are evaluated. One more technique to be introduced here is the visual digital reconstruction of the burnt paintings, which has the potential to provide an estimate of the degree of the required treatment.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"2 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":"124301963","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

Pulse oximetry as a diagnostic tool in dental medicine 脉搏血氧仪在牙科医学诊断中的应用

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262267

D. Kosturkov, T. Uzunov, P. Uzunova

引用次数: 2

Conical intersections S0/S1 of thymine mediating the non-radiative photodestruction of cyclobutane dimers: a CASSCF level study 胸腺嘧啶的锥形交点S0/S1介导环丁烷二聚体的非辐射光破坏:CASSCF水平的研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2263479

P. Kancheva, V. Delchev

引用次数: 0

Contribution of the polarization moments of different rank to the integral CPT signal 不同阶极化矩对积分CPT信号的贡献

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261673

E. Taskova, E. Alipieva, G. Todorov

引用次数: 0