GR-I International Conference on New Laser Technologies and Applications最新文献

10-W copper bromide laser for precision materials processing 用于精密材料加工的10w溴化铜激光器

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316624

J. Mizeraczyk, Mostefa Mohamed-Seghir, I. Kostadinov, N. Sabotinov, E. S. Livingstone, C. E. Little

引用次数: 0

Problems of laser spectronephelometry in medicine and some variants of their solution 医学中激光光谱比浊法存在的问题及其解决方法

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316636

M. Kugeiko, A. V. Barkova

引用次数: 0

Diode-pumped all-solid state lasers: solutions for scientific, biomedical, and industrial applications 二极管泵浦全固态激光器:科学，生物医学和工业应用的解决方案

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316564

A. Agnesi, G. Reali

引用次数: 0

Diffusing wave spectroscopy in dynamically heterogeneous random media 动态非均质随机介质中的扩散波谱学

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316593

S. E. Skipetrov, R. Maynard

{"title":"Diffusing wave spectroscopy in dynamically heterogeneous random media","authors":"S. E. Skipetrov, R. Maynard","doi":"10.1117/12.316593","DOIUrl":"https://doi.org/10.1117/12.316593","url":null,"abstract":"We present a theoretical analysis of temporal autocorrelation functions of multiply scattered light in turbid dynamically heterogenous random media. Particular geometries of planar slab and cylindrical capillary inserted in an otherwise macroscopically homogeneous medium are considered. Analytical expressions for time autocorrelation functions of depolarized scattered electric field measured at the sample surface are derived assuming that scatterers dynamics inside dynamically heterogeneous region differs from that in surrounding medium. We show that space resolved measurements of the temporal autocorrelation function of multiply scattered light at the sample surface provide information on spatially heterogeneous particle dynamics inside the sample and allows one to image hidden dynamic inclusion under conditions of no static scattering contrast. Spatial contrast in this case is purely dynamic and can be provided by different particle sizes as well as by different types of particle dynamics inside the inclusion and in background medium. The limitations of presented theoretical approach are outlined. Finally, we estimate the performance of the imaging technique based on the considered theory.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125365749","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

VIS and UV laser ablation of polymers 聚合物的VIS和UV激光烧蚀

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316621

M. Makropoulou, A. Papayannis, A. Serafetinides, Constantine Skordoulis

{"title":"VIS and UV laser ablation of polymers","authors":"M. Makropoulou, A. Papayannis, A. Serafetinides, Constantine Skordoulis","doi":"10.1117/12.316621","DOIUrl":"https://doi.org/10.1117/12.316621","url":null,"abstract":"Pulsed laser ablation is well established as a universal tool for surface processing of organic polymer materials. The polymer ablation efficiency of different laser wavelengths, from 355 nm to 532 nm, is studied for short laser pulses, of nanosecond pulse duration. Ablation rates of polymers have been measured by irradiating the polymers using a pulsed Nd:YAG laser. This laser source produced pulses at the second and third harmonic simultaneously at (lambda) equals 532 nm and (lambda) equals 355 nm. Effective ablation was also observed by irradiating the polymer samples with the Raman-shifted Nd:YAG laser, at (lambda) equals 397.1 nm, in order to investigate comparatively the ablation efficiency at different laser settings. For transparent materials, in the corresponding ablation wavelengths and pulse width, the dependence of the ablation rate on the laser spot diameter and the laser energy fluence has been investigated. In general, the polymers used in this work show a more or less pronounced increase of the ablation rate with decreasing spot diameter for the same fluence, especially in the case of visible laser irradiation.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126870465","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

Decomposition techniques of exponential operators and paraxial light optics 指数算子分解技术与近轴光学

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316574

G. Dattoli, A. Torre

引用次数: 0

In-vitro study on ALA-induced endogenous protoporphyrin IX as photosensitizer for photodynamic tumor diagnosis and therapy ala诱导的内源性原卟啉IX作为光动力肿瘤诊断和治疗的光敏剂的体外研究

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316627

K. Ueberriegler, D. Fiedler, T. Verwanger, G. Schnitzhofer, E. Banieghbal, B. Krammer

{"title":"In-vitro study on ALA-induced endogenous protoporphyrin IX as photosensitizer for photodynamic tumor diagnosis and therapy","authors":"K. Ueberriegler, D. Fiedler, T. Verwanger, G. Schnitzhofer, E. Banieghbal, B. Krammer","doi":"10.1117/12.316627","DOIUrl":"https://doi.org/10.1117/12.316627","url":null,"abstract":"Photodynamic tumor diagnosis and therapy is efficiently carried out by endogenous protoporphyrin IX as photosensitizer, induced by external addition of the precursor 5-aminolevulinic acid (ALA). In the present study, PpIX localization and photodynamically induced damage was investigated in normal and transformed human fibroblasts. PpIX formation reaches its maximum after incubation for at least 20 h with 700 (mu) g/m1 ALA, and increases with the pH- value. ALA has to be given 20-30 times more than external PpIX in order to produce the same cytotoxic damage. As detected by Low Light Imaging, PpIX is generated in the mitochondria, released to the cytoplasm and distributed to cytoplasma and nuclear membranes.The nucleus is not stained. Intracellular targets of PpIX damage after irradiation are mainly mitochondria, ER and nuclear membrane. The organelles show a decomposition pattern, which resembles apoptotic morphology and occurs faster in the co-cultivated transformed than in the normal cells. ALA-treated hepatocytes produce micronuclei and chromosomal aberrations, which indicates some mutagenic potential. Expression studies of the (proto)oncogenes c-myc and bcl-2 sublethally treated fibroblasts by quantitative RT-PCR show high deviations from the constitutive expression level, which are accompanied by cell cycle disturbances, indicating a possible precursor role to apoptosis introduction.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124331484","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

Spectrum analysis of the arc for laser-guided robot welding applications 电弧光谱分析在激光引导机器人焊接中的应用

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316616

G. Agapiou, C. Kassiouras, A. Serafetinides

引用次数: 0

High-sensitivity trace-gas monitoring for medical and environmental applications using a semiconductor diode laser 使用半导体二极管激光器的医疗和环境应用的高灵敏度痕量气体监测

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316585

C. Corsi, M. Gabrysch, G. Modugno, F. Pavone, M. Inguscio

引用次数: 0

Laser action from (B2Σ-X2Σ)HgBr induced by UV laser multiphoton dissociation of HgBr2: measurements and experimental results 紫外激光多光子解离HgBr2诱导(B2Σ-X2Σ)HgBr的激光作用:测量和实验结果

GR-I International Conference on New Laser Technologies and Applications Pub Date : 1998-07-14 DOI: 10.1117/12.316554

T. Efthimiopoulos, D. Zevgolis, J. Katsenos, D. Zigos

引用次数: 0