Laser Damage最新文献_第8页

1030-nm nanosecond LIDT of dielectric coatings on yttrium aluminium garnet 钇铝石榴石介质涂层的1030-nm纳秒LIDT

Laser Damage Pub Date : 2020-10-23 DOI: 10.1117/12.2571845

S. Uxa, J. Vanda, M. Mureșan, V. Škoda

引用次数: 0

213 nm Nd-YAG pulsed laser damage of non-loaded and hydrogen-loaded silica-based fibers 213 nm Nd-YAG脉冲激光对硅基光纤的损伤

Laser Damage Pub Date : 2020-10-20 DOI: 10.1117/12.2574380

S. Heiden, P. Raithel, R. Yadav, K. Klein

{"title":"213 nm Nd-YAG pulsed laser damage of non-loaded and hydrogen-loaded silica-based fibers","authors":"S. Heiden, P. Raithel, R. Yadav, K. Klein","doi":"10.1117/12.2574380","DOIUrl":"https://doi.org/10.1117/12.2574380","url":null,"abstract":"An automated set-up for 213 nm UV laser damaging in parallel to spectral analyses will be used to show the spectral laser damaging in silica-based fibers with low hydroxyl content. The 213 nm wavelength is ideal, because it is close to the peak wavelength of one of the E’-centers in silica. Due to automation, short-term measurements down to 0.5 s and long-term measurements up to 2 days and more are possible. In addition, the spectral transmission changes are fitted with multiple Gaussian shaped bands. Although the basic attenuation in non-loaded fibers is high, the pulse energies are still high enough to generate defects along a 1 m long fiber. For the first time, to our knowledge, a transfer from E’γ to E’γ is observed within 1 s, with a laser repetition rate of 2 kHz. Due to optimal fitting, a band around 180 nm is likely influencing the UVC region. In hydrogen-loaded fibers, similar UV defects are seen. The related absorption bands can be optimally adopted to measurement results. The E’-centers play a minor role in short-term measurements because these defects are passivated during hydrogen-loading. Additionally, the band at 328 nm due to molecular chlorine will be reduced. The temporal behavior of all absorption band, including the predicted 180 nm band, are shown.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128843912","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

Multiple pulse picosecond laser induced damage threshold on hybrid mirrors 多脉冲皮秒激光诱导混合反射镜损伤阈值

Laser Damage Pub Date : 2020-10-20 DOI: 10.1117/12.2572131

J. Vanda, M. Mureșan, P. Čech, Martin Mydlář, Kateřina Pilná, A. Lucianetti, J. Brajer, T. Mocek, S. Uxa, V. Škoda

引用次数: 0

Fabrication of antireflection microstructure on GaSe crystal surface by single-pulse femtosecond laser ablation 单脉冲飞秒激光烧蚀制备GaSe晶体表面增透微结构

Laser Damage Pub Date : 2020-10-16 DOI: 10.1117/12.2570879

A. Bushunov, A. Teslenko, M. Tarabrin, V. Lazarev, L. Isaenko, A. Eliseev, S. Lobanov, V. N. Vedenyapin

引用次数: 0

Damage probability versus damage density: analysis from tests using small beams versus large beams 损伤概率与损伤密度:小梁与大梁试验分析

Laser Damage Pub Date : 2020-10-07 DOI: 10.1117/12.2571834

L. Lamaignère, M. Veinhard, F. Tournemenne, C. Bouyer, R. Parreault, R. Courchinoux, J. Natoli, C. Rouyer, S. Bouillet

引用次数: 4

Study of Electric Field Enhancement Caused by Debris on Laser Optics (Withdrawal Notice) 碎片对激光光学器件电场增强的研究(撤回公告)

Laser Damage Pub Date : 2020-09-18 DOI: 10.1117/12.2571062

Hu Huang, K. Kafka, S. Demos

引用次数: 0

Investigation of excitation dynamics in HfO2 and SiO2 monolayers using subpicosecond pump-and-probe damage testing (Withdrawal Notice) 利用亚皮秒泵探损伤试验研究HfO2和SiO2单层的激发动力学(撤回通知)

Laser Damage Pub Date : 2020-09-11 DOI: 10.1117/12.2571240

K. Kafka, B. Hoffman, A. Kozlov, S. Demos

引用次数: 0

Continuous wave laser induced damage threshold of AMTIR-1, 2, 5 and 7 chalcogenide windows at 1.07 microns 连续波激光在1.07微米处诱导AMTIR-1、2、5和7硫族化物窗口的损伤阈值

Laser Damage Pub Date : 2020-09-11 DOI: 10.1117/12.2572934

J. McElhenny, N. Bambha

引用次数: 0

A shadowing technique to arrest laser-induced damage growth on exit surface silica 在出口表面二氧化硅上阻止激光诱导损伤生长的遮蔽技术

Laser Damage Pub Date : 2019-12-27 DOI: 10.1117/12.2539152

R. Raman, Raminder Garcha, M. Rushford, G. Guss, W. Carr

{"title":"A shadowing technique to arrest laser-induced damage growth on exit surface silica","authors":"R. Raman, Raminder Garcha, M. Rushford, G. Guss, W. Carr","doi":"10.1117/12.2539152","DOIUrl":"https://doi.org/10.1117/12.2539152","url":null,"abstract":"An effective damage mitigation strategy is necessary to operate laser systems at energy densities above the damage growth threshold of their optical components. On the National Ignition Facility, growth of laser-induced damage has conventionally been arrested in situ by employing spatially registered cm-scale “spot blockers” in the laser beam to shadow mm-scale damage sites. Spot blockers come at a cost, however, as they obscure a portion of the laser light delivered to the target and thus require an increase in beam energy to compensate for this loss. This increase adds incremental stress to all optics in the beamline. Most spot blockers assigned to an optic are eliminated as part of the repair process when the optic is removed from NIF. However, defects too wide or deep to repair travel with the optic, along with the need for the blocker, throughout its life. Due to obscuration budgetary constraints, these permanent blockers reduce the optic’s usable lifetime. In this work, we propose an alternative method for mitigating a growing damage site by placing a scattering structure of comparable size to the site upstream to shadow the site. This solution obscures much less of the laser light and increases the lifetime of the optic compared to current mitigation strategies.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132164006","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 fatigue investigation with in situ time resolved digital holography 光学疲劳的原位时间分辨数字全息研究

Laser Damage Pub Date : 2019-12-17 DOI: 10.1117/12.2536445

Balys Momgaudis, L. Smalakys, M. Vengris, A. Melninkaitis

{"title":"Optical fatigue investigation with in situ time resolved digital holography","authors":"Balys Momgaudis, L. Smalakys, M. Vengris, A. Melninkaitis","doi":"10.1117/12.2536445","DOIUrl":"https://doi.org/10.1117/12.2536445","url":null,"abstract":"So called “optical fatigue effect” of transparent optical materials is triggered by repetitive laser pulses. It first appears in form of gradual modification of optical properties of the element (change in refractive index or absorption) and eventually leads to formation of catastrophic damage. As this phenomenon can be governed by distinct underlying physical processes it is also sensitive to laser irradiation conditions, intrinsic material and environmental properties, thus it is not always deterministic and therefore hardly predictable. There exist models of optical fatigue that relate absorbed pulse energy, dynamics of lattice deformation, reduced mechanical strength and heat accumulation to predict optical damage, however many quantitative features of such materials as well as scaling laws of irradiation for such models remain unknown. In order to address this issue appropriate set of experimental data is needed. Thus, well known transparent material - fused quartz - was investigated in bulk by using in situ quantitative tool, namely time-resolved digital holographic microscopy. Optical materials response was investigated by optically probing excited material at different time delays. Various dependencies were investigated by changing pump irradiation conditions as a function of incident laser pulses.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127937307","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