Laser Damage最新文献_第9页

Revised models for the underlying physics and mitigations of laser induced filamentation damage in large aperture laser optics 修正了大口径激光光学中激光诱导成丝损伤的基本物理模型和缓解方法

Laser Damage Pub Date : 2019-12-17 DOI: 10.1117/12.2536688

E. Feigenbaum, J. Di Nicola, J. Bude

{"title":"Revised models for the underlying physics and mitigations of laser induced filamentation damage in large aperture laser optics","authors":"E. Feigenbaum, J. Di Nicola, J. Bude","doi":"10.1117/12.2536688","DOIUrl":"https://doi.org/10.1117/12.2536688","url":null,"abstract":"The necessity for durable optics for higher laser fluences and intensities grows as new technological advancements allow for increased peak powers of laser systems. This has motivated a substantial effort in the last decades to better understand laser induced damage mechanisms and their mitigation. One major damage mechanism limitation to laser systems at high peak intensities is filamentation in fused silica glass, due to Kerr self-focusing of the light [1], that has been motivating an on-going effort for the last few decades [2]. The past studies had led to a set of simplified rules that allows for the operation of laser system below the onset point for this mechanism to take place, namely what is known as the IL rule (intensity times the collapse distance before filamenting equals some empirical constant) and the Bespalov-Talanov (BT) perturbation growth theory [3-6]. The need to increase the laser beam intensities and optimize the throughput, closer to the point where the optical propagation length in the material is comparable to the predicted filamentation distance, requires revisiting and improving our understanding of the current rule set. This is especially emphasized by the shortcomings of these two highly useful yet under-justified models for the relevant situations of large aperture beams where the contrast perturbations on the beam are the seed for the filamentations (i.e., and not whole beam collapse).","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":"115798686","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

Direct comparison of laser-induced damage threshold testing protocols on dielectric mirrors: effect of nanosecond laser pulse shape at NIR and UV wavelengths 介质反射镜激光损伤阈值测试方案的直接比较:近红外和紫外波长纳秒激光脉冲形状的影响

Laser Damage Pub Date : 2019-12-17 DOI: 10.1117/12.2536456

Rūta Pakalnytė, E. Pupka, A. Melninkaitis

{"title":"Direct comparison of laser-induced damage threshold testing protocols on dielectric mirrors: effect of nanosecond laser pulse shape at NIR and UV wavelengths","authors":"Rūta Pakalnytė, E. Pupka, A. Melninkaitis","doi":"10.1117/12.2536456","DOIUrl":"https://doi.org/10.1117/12.2536456","url":null,"abstract":"As a rule of thumb, laser-induced damage threshold (LIDT) is often reported in terms of a single number, without even mentioning the testing details. However, meaning of reported LIDT numbers could be different depending on the testing protocol used. Such differences are not always obvious to practitioners that are designing or building laser systems (users of LIDT numbers). Furthermore, the properties of laser sources used for LIDT testing could also be very different among various testing laboratories. Thus, in order to exemplify possible effects of LIDT testing details on reported values an experimental study is conducted, where direct comparison of the most popular testing protocols, namely 1-on-1, S-on-1, R-on-1, and Raster Scan, is made. Experiments were organized in such a way that all the tests for the wavelength of interest were done on the same sample (conventional high-reflectivity HR mirror) by using both injection-seeded pulses (single longitudinal mode) as well as non-seeded (multimode) pulses with comparable effective pulse duration. Two sufficiently large dielectric mirrors were tested. Experiments were conducted for fundamental- (1064 nm) and third- (355 nm) harmonic wavelengths of Nd:YAG laser. The LIDTs obtained by using distinct testing protocols as well as pertinent damage morphologies are directly compared and discussed.","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":"131957326","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

Influence of ultra-sonic frequency during substrate cleaning on the laser resistance of antireflection coatings 基材清洗过程中超声波频率对增透涂层抗激光性能的影响

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536442

T. Gischkat, D. Schachtler, Z. Balogh-Michels, R. Botha, André Mocker, B. Eiermann, Sven Günther

{"title":"Influence of ultra-sonic frequency during substrate cleaning on the laser resistance of antireflection coatings","authors":"T. Gischkat, D. Schachtler, Z. Balogh-Michels, R. Botha, André Mocker, B. Eiermann, Sven Günther","doi":"10.1117/12.2536442","DOIUrl":"https://doi.org/10.1117/12.2536442","url":null,"abstract":"Cleaning of substrates prior to optical coating is an important step in the manufacturing of high performance optical components. It is well known that the ultra-sonic frequency used during substrate cleaning has a strong influence on the quality of the cleaning process and the number of remaining particles on the surface. Therefore, we have investigated the influence of ultra-sonic frequency during substrate cleaning on the laser resistance of antireflection coatings. For this purpose, a SiO2 / Ta2O5 AR-coating for a normal angle of incidence at 1064 nm was deposited onto fused silica substrates. Prior to deposition, the substrates were cleaned with cleaning processes. The applied ultra-sonic frequencies were 40, 80, 120 and 500 kHz. After deposition the LIDT was measured using a 1064 nm ns-pulsed laser test bench. It turned out that the different ultra-sonic-cleaning processes have a strong influence on the number of remaining particles on the surface of the cleaned samples. The counted number of particles with sizes greater < 83 nm were between 1320 and 12 particles for the different applied ultra-sonic frequencies. In consequence the different cleaned and AR-coated samples show different laser damage behavior. Nevertheless the measured particle density does not totally explain the differences in laser resistance.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115456022","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

Third harmonic (TH) generation: a tool to study dielectric material properties near the laser induced damage threshold (LIDT) 三次谐波(TH)产生:研究激光诱导损伤阈值(LIDT)附近介电材料特性的工具

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536440

Amir Khabbazi Oskouei, L. Emmert, M. Steinecke, M. Jupé, D. Ristau, L. Jensen, W. Rudolph

引用次数: 0

Monte Carlo analysis of ISO and raster scan laser damage protocols 蒙特卡罗分析ISO和光栅扫描激光损伤协议

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536443

C. Stolz, R. Negres, J. Arenberg

{"title":"Monte Carlo analysis of ISO and raster scan laser damage protocols","authors":"C. Stolz, R. Negres, J. Arenberg","doi":"10.1117/12.2536443","DOIUrl":"https://doi.org/10.1117/12.2536443","url":null,"abstract":"The typical measurement error reported for laser damage tests is the fluence uncertainty due to inaccuracies in measuring the laser beam energy and its diameter. However, the inherent uncertainty of the testing protocol should also be included in the reported laser damage threshold error bars. Underestimating measurement errors can lead to false conclusions about the impact of process changes on laser damage resistance. In this study, four different laser damage precursor fluence distributions were created from randomly generated numbers and then evaluated using the ISO and raster scan laser damage test protocols to determine a laser damage threshold. Measurement errors are determined for flat top test beams for multiple cases. To add real world relevance, the impact of Gaussian test beams with beam pointing instability was modeled for the lowest accuracy laser damage precursor distribution. The impact of damage test area compared to optic dimension is also examined. The measurement error for the raster scan test ranged from 8% to 24% depending on the test beam spatial profile (flat top or Gaussian) and beam pointing stability. ISO measurement errors ranged from 4% to 250% for a simulated 10 J/cm2 test and was much more sensitive to the laser damage precursor distribution as well as the spatial profile and pointing of the test beam. Both testing protocols poorly predicted the laser damage resistance of large areas with Gaussian precursor laser damage distributions.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121533007","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

The direct absorption measurement of fused silica, CaF2, MgF2, and sapphire at VUV and IR region 熔融二氧化硅、CaF2、MgF2和蓝宝石在紫外和红外区的直接吸收测量

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536388

K. Kato, C. Higashimura, S. Niisaka

引用次数: 1

Damage performance of fused silica debris shield at the National Ignition Facility 国家点火装置熔融硅碎片屏蔽的损伤性能

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536452

Z. Liao, C. Carr, D. Cross, C. Miller, P. Miller, M. Monticelli, B. Olejniczak, R. Raman, D. VanBlarcom, B. Welday, P. Whitman, L. Wong, T. Suratwala

引用次数: 1

1064-nm, nanosecond laser mirror thin film damage competition 1064nm，纳秒激光反射薄膜损伤竞赛

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2531861

R. Negres, C. Stolz, Michael D. Thomas, M. Caputo

引用次数: 1

Removal of laser-induced contamination on ALADIN laser optics by UV/ozone cleaning 紫外/臭氧清洗去除ALADIN激光光学器件上的激光诱导污染

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2535772

N. Bartels, P. Allenspacher, W. Riede, H. Schröder, D. Wernham

引用次数: 3

Laser damage characteristics of indium-tin-oxide film and polyimide film irradiated by 1064nm high power lasers 1064nm高功率激光辐照铟锡氧化膜和聚酰亚胺膜的激光损伤特性

Laser Damage Pub Date : 2019-11-20 DOI: 10.1117/12.2536330

Xiaofeng Liu, Liping Peng, Xi Wang, Xiaoshuang Wang, Da-wei Li, Yuanan Zhao, J. Shao

{"title":"Laser damage characteristics of indium-tin-oxide film and polyimide film irradiated by 1064nm high power lasers","authors":"Xiaofeng Liu, Liping Peng, Xi Wang, Xiaoshuang Wang, Da-wei Li, Yuanan Zhao, J. Shao","doi":"10.1117/12.2536330","DOIUrl":"https://doi.org/10.1117/12.2536330","url":null,"abstract":"The damage characteristics of the indium-tin-oxide (ITO) layer and the polyimide (PI) layer, which are two constituent components of a LCD, induced by a high-peak-power laser and a high-average-power laser are investigated. The PI alignment layer is pinned on the ITO film to imitate the structure of the LCD as much as possible in our study. Under the irradiation of the high-peak-power laser, the damage process of the PI/ITO/SUB sample involves thermally induced plastic deformation, followed by cooling when the irradiation fluence is near the LIDT, and rupture when the irradiation fluence is higher. High-average-power laser irradiation results in damaged morphologies of the bulge for the PI/ITO/SUB sample. The temperature distributions induced by the pulsed laser and the high-repetition-rate laser are investigated. The damage is attributed to the intrinsic heat absorption of the ITO films. Under the irritation of the high-peak-power laser, the temperature rises rapidly to a high degree at very short time because of the instant strong absorption in ITO layer, and resulted in vaporization of ITO layer consequently. Subsequently, the vaporized ITO breaks through the surface PI and develops the visible damage. However, under the irritation of high-average-power laser, ITO layer absorbs laser energy, resulting in a slow temperature rise and a small temperature gradient.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114659983","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