SPIE Laser Damage最新文献_第9页

Spectrally resolved laser calorimetric absorptance measurements 光谱分辨激光量热吸收测量

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752907

L. Jensen, I. Balasa, K. Starke, D. Ristau

引用次数: 3

Thermal mechanism of laser-induced damages in KDP crystals 激光致KDP晶体损伤的热机制

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752824

A. Surmin, S. Lambert, F. Guillet, B. Minot, D. Damiani, F. Gervais

引用次数: 4

Influence of electric field distribution on laser induced damage threshold and morphology of high reflectance optical coatings 电场分布对高反射率光学涂层激光损伤阈值及形貌的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752902

G. Abromavičius, R. Buzelis, R. Drazdys, A. Melninkaitis, V. Sirutkaitis

{"title":"Influence of electric field distribution on laser induced damage threshold and morphology of high reflectance optical coatings","authors":"G. Abromavičius, R. Buzelis, R. Drazdys, A. Melninkaitis, V. Sirutkaitis","doi":"10.1117/12.752902","DOIUrl":"https://doi.org/10.1117/12.752902","url":null,"abstract":"Various investigations show that damage threshold of optical coatings by intense ultrashort laser pulses is closely related to the intensity of electric field at layer interfaces. LIDT measurements of high reflectance optical coatings using femtosecond pulses at 800 nm wavelength are presented. ZrO2, HfO2 and Ta2O5 as high refractive index materials for two sets of experiments were chosen. Two different coating designs were investigated: standard quarter-wavelength design with SiO2 overcoat and modified \"E-field\" non quarter-wavelength design with suppressed electric field. Damage sites were studied using optical and AFM microscopes. Relation between electric field distribution and damage morphology was observed. The results demonstrate, that suppressing electric field at layer interfaces enables to increase LIDT for high reflectance coatings almost twice if compared to standard quarter-wavelength design when using ultrashort laser pulses. However electric field distribution is sensitive to variations in thicknesses of outer layers, so deposition process should be precisely controlled to get improvement in LIDT of coatings.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129982718","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: 39

Influence of laser beam size and wavelength in the determination of LIDT and associated laser damage precursor densities in KH2PO4 激光束尺寸和波长对KH2PO4中LIDT测定及相关激光损伤前驱体密度的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.750142

J. Natoli, J. Capoulade, H. Piombini, B. Bertussi

{"title":"Influence of laser beam size and wavelength in the determination of LIDT and associated laser damage precursor densities in KH2PO4","authors":"J. Natoli, J. Capoulade, H. Piombini, B. Bertussi","doi":"10.1117/12.750142","DOIUrl":"https://doi.org/10.1117/12.750142","url":null,"abstract":"The laser resistance of large optical components remains an important limitation for the performances and the maintenance costs in LMJ or NIF projects. For practical reasons LIDT studies are commonly performed with small samples and table top lasers whose characteristics change from one to another. In these conditions, it is necessary to know exactly the influence of the different experimental parameters (wavelength, spot size, ...) on the final data. These considerations are particularly true in heterogeneous materials as KDP crystals. Indeed the use of different laser beam sizes (from μm to hundreds μm) to plot laser damage probability curves had clearly shown that at 355nm in KDP, it is possible to exhibit a limit of irradiated area which permit to distinguish two different LIDT associated with two laser damage precursors densities. This prior result has put in evidence the influence of irradiated beam size in the discrimination of different kinds of defects in KDP. We present in this paper a systematic study of beam size effect in KDP for three different wavelengths: 355nm, 532nm and 1064nm. This study performed in 1:1 and R:1 mode will reveal precursors for each wavelength and their respective evolution under repetitive shots for small and large beams. This multi-parameters study will help us to highlight mechanisms involved in laser-induced damage in KDP crystal.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114763837","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: 21

James Webb Space Telescope: a large deployable cryogenic telescope in space 詹姆斯·韦伯太空望远镜:在太空中可展开的大型低温望远镜

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.754010

P. Lightsey

引用次数: 61

Effects of wavelengths combination on initiation and growth of laser-induced surface damage in SiO2 波长组合对SiO2激光表面损伤萌生和生长的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.753057

L. Lamaignère, S. Reyné, M. Loiseau, J. Poncetta, H. Bercegol

引用次数: 25

Preliminary results on mitigation of KDP surface damage using the ball dimpling method 球窝法缓解KDP表面损伤的初步结果

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752822

F. Guillet, B. Bertussi, L. Lamaignère, X. Leborgne, B. Minot

引用次数: 23

Short pulse laser damage measurements of pulse compression gratings for petawatt laser 佩瓦激光器脉冲压缩光栅的短脉冲激光损伤测量

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752783

G. Razé, J. Néauport, G. Dupuy, M. Balas, G. Mennerat, E. Lavastre

引用次数: 2

Progress in the understanding of fracture related laser damage of fused silica 熔融石英激光损伤与断裂的认识进展

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752830

H. Bercegol, P. Grua, D. Hébert, J. Morreeuw

{"title":"Progress in the understanding of fracture related laser damage of fused silica","authors":"H. Bercegol, P. Grua, D. Hébert, J. Morreeuw","doi":"10.1117/12.752830","DOIUrl":"https://doi.org/10.1117/12.752830","url":null,"abstract":"Numerous experimental and theoretical contributions in the past have stressed the detrimental effect of fractures in the generation of surface laser damage sites in fused silica illuminated at 351 nm. However, two very important steps lack for the moment on the way towards a scientific understanding of the role of fractures. 1. a physical model must be developed to predict damage events starting from real defect sites 2. a reproducible measurement must be obtained and compared with calculations. Here we present the theoretical work realized to reach the first goal. Contrary to previous discussions on fractures, the electromagnetic configuration is calculated in the case of a real material, with electronic surface states, bulk defects, and defects dynamics. Due to electromagnetic field enhancement in the fracture, surface defects absorb a sufficient part of laser energy, able to heat silica above the vaporization temperature. This is the initial event that triggers production of more excited states during the pulse, and steep increase of temperature and pressure fields. Comparisons with available experimental results are positive. Calculated fluences of damage initiation are very near those of measured events on engineered fractures, or on real defects in polished samples.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128560029","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: 48

The exponential fitting of optical threshold and analyses of testing errors 光学阈值的指数拟合及测试误差分析

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752814

Da-wei Li, J. Shao, Yuanan Zhao, Kui Yi, H. Qi

引用次数: 0