Laser-induced damage threshold (LIDT) of dielectric coatings prepared on monocrystalline neodymium-doped yttrium aluminium garnet (YAG) substrates was studied. Various coating designs were prepared using either reactive or ionassisted e-beam deposition technology and tested at 1030 nm 10 ns in r-on-1 mode according to the ISO 21254 standard. Measured damage thresholds were compared and LIDT was discussed with respect to thin-film design and coating technology.
{"title":"1030-nm nanosecond LIDT of dielectric coatings on yttrium aluminium garnet","authors":"S. Uxa, J. Vanda, M. Mureșan, V. Škoda","doi":"10.1117/12.2571845","DOIUrl":"https://doi.org/10.1117/12.2571845","url":null,"abstract":"Laser-induced damage threshold (LIDT) of dielectric coatings prepared on monocrystalline neodymium-doped yttrium aluminium garnet (YAG) substrates was studied. Various coating designs were prepared using either reactive or ionassisted e-beam deposition technology and tested at 1030 nm 10 ns in r-on-1 mode according to the ISO 21254 standard. Measured damage thresholds were compared and LIDT was discussed with respect to thin-film design and coating technology.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131569284","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}
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.
{"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":"11514 1","pages":"0"},"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}
J. Vanda, M. Mureșan, P. Čech, Martin Mydlář, Kateřina Pilná, A. Lucianetti, J. Brajer, T. Mocek, S. Uxa, V. Škoda
So-called hybrid mirrors consists of broadband metallic surface coated with high reflection dielectric multilayer designed for specific wavelength. Such reflectors become more important with progressing development of multiband laser sources realized using parametric down conversion system, in particular for ultrashort-pulsed sources. Multiple pulse picosecond laser induced damage on such mirrors, tested by s-on-1 ISO-compliant method, is important part in development of such components, as there is a need in feedback predicating performance of novel designs. In following paper, we examine laser damage performance of several different designs of silver protected mirrors equipped with HR coating at 1030 nm.
{"title":"Multiple pulse picosecond laser induced damage threshold on hybrid mirrors","authors":"J. Vanda, M. Mureșan, P. Čech, Martin Mydlář, Kateřina Pilná, A. Lucianetti, J. Brajer, T. Mocek, S. Uxa, V. Škoda","doi":"10.1117/12.2572131","DOIUrl":"https://doi.org/10.1117/12.2572131","url":null,"abstract":"So-called hybrid mirrors consists of broadband metallic surface coated with high reflection dielectric multilayer designed for specific wavelength. Such reflectors become more important with progressing development of multiband laser sources realized using parametric down conversion system, in particular for ultrashort-pulsed sources. Multiple pulse picosecond laser induced damage on such mirrors, tested by s-on-1 ISO-compliant method, is important part in development of such components, as there is a need in feedback predicating performance of novel designs. In following paper, we examine laser damage performance of several different designs of silver protected mirrors equipped with HR coating at 1030 nm.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116522566","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}
A. Bushunov, A. Teslenko, M. Tarabrin, V. Lazarev, L. Isaenko, A. Eliseev, S. Lobanov, V. N. Vedenyapin
GaSe crystals that are promising as nonlinear optical converters in the mid- and far-infrared ranges are charac- terized by high Fresnel losses leading to transmittance per surface at the level of 77%. In this study, antireflection microstructures (ARMs) were fabricated on the surface of the GaSe single crystal by single-pulse femtosecond laser ablation. This method makes it possible to increase the transmission up to up to 92%.
{"title":"Fabrication of antireflection microstructure on GaSe crystal surface by single-pulse femtosecond laser ablation","authors":"A. Bushunov, A. Teslenko, M. Tarabrin, V. Lazarev, L. Isaenko, A. Eliseev, S. Lobanov, V. N. Vedenyapin","doi":"10.1117/12.2570879","DOIUrl":"https://doi.org/10.1117/12.2570879","url":null,"abstract":"GaSe crystals that are promising as nonlinear optical converters in the mid- and far-infrared ranges are charac- terized by high Fresnel losses leading to transmittance per surface at the level of 77%. In this study, antireflection microstructures (ARMs) were fabricated on the surface of the GaSe single crystal by single-pulse femtosecond laser ablation. This method makes it possible to increase the transmission up to up to 92%.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130542413","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}
L. Lamaignère, M. Veinhard, F. Tournemenne, C. Bouyer, R. Parreault, R. Courchinoux, J. Natoli, C. Rouyer, S. Bouillet
The paper aims to compare the results obtained with the same laser source with a large beam and with small beams. These latest were shaped from phase objects implemented to obtain several small beams from a single larger beam. The consistency of the results from both sets of measurements is shown. It validates the assumptions made and the specific mathematical treatments implemented to establish the link between the two approaches. It also validates and strengthens the approach developed from the rasterscan procedure used to measure damage densities from the scanning with beams of small dimensions. This shows that small beam tests are reasonably representative of tests carried out with large beams.
{"title":"Damage probability versus damage density: analysis from tests using small beams versus large beams","authors":"L. Lamaignère, M. Veinhard, F. Tournemenne, C. Bouyer, R. Parreault, R. Courchinoux, J. Natoli, C. Rouyer, S. Bouillet","doi":"10.1117/12.2571834","DOIUrl":"https://doi.org/10.1117/12.2571834","url":null,"abstract":"The paper aims to compare the results obtained with the same laser source with a large beam and with small beams. These latest were shaped from phase objects implemented to obtain several small beams from a single larger beam. The consistency of the results from both sets of measurements is shown. It validates the assumptions made and the specific mathematical treatments implemented to establish the link between the two approaches. It also validates and strengthens the approach developed from the rasterscan procedure used to measure damage densities from the scanning with beams of small dimensions. This shows that small beam tests are reasonably representative of tests carried out with large beams.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125454149","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}
This presentation, originally published on 11 September 2020, was withdrawn per author request.
本报告最初发表于2020年9月11日，应作者要求已被撤回。
{"title":"Study of Electric Field Enhancement Caused by Debris on Laser Optics (Withdrawal Notice)","authors":"Hu Huang, K. Kafka, S. Demos","doi":"10.1117/12.2571062","DOIUrl":"https://doi.org/10.1117/12.2571062","url":null,"abstract":"This presentation, originally published on 11 September 2020, was withdrawn per author request.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122369509","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}
This presentation, originally published on 11 September 2020, was withdrawn per author request.
本报告最初发表于2020年9月11日，应作者要求已被撤回。
{"title":"Investigation of excitation dynamics in HfO2 and SiO2 monolayers using subpicosecond pump-and-probe damage testing (Withdrawal Notice)","authors":"K. Kafka, B. Hoffman, A. Kozlov, S. Demos","doi":"10.1117/12.2571240","DOIUrl":"https://doi.org/10.1117/12.2571240","url":null,"abstract":"This presentation, originally published on 11 September 2020, was withdrawn per author request.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"11514 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128771067","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}
The continuous wave laser-induced damage thresholds of Amorphous Materials chalcogenide glasses, Amorphous Materials AMTIR-1, AMTIR-2, AMTIR-5, and AMTIR-7 are measured for a 5s exposure of 1.07 μm light focused to a spot size with 1/e2 diameter of 830 μm or 1044 μm, following the International Organization for Standardization standards.
{"title":"Continuous wave laser induced damage threshold of AMTIR-1, 2, 5 and 7 chalcogenide windows at 1.07 microns","authors":"J. McElhenny, N. Bambha","doi":"10.1117/12.2572934","DOIUrl":"https://doi.org/10.1117/12.2572934","url":null,"abstract":"The continuous wave laser-induced damage thresholds of Amorphous Materials chalcogenide glasses, Amorphous Materials AMTIR-1, AMTIR-2, AMTIR-5, and AMTIR-7 are measured for a 5s exposure of 1.07 μm light focused to a spot size with 1/e2 diameter of 830 μm or 1044 μm, following the International Organization for Standardization standards.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126471732","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}
R. Raman, Raminder Garcha, M. Rushford, G. Guss, W. Carr
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.
{"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":"51 1","pages":"0"},"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}
Balys Momgaudis, L. Smalakys, M. Vengris, A. Melninkaitis
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.
{"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":"9 1","pages":"0"},"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}
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