Laser Damage最新文献_第7页

Thermal laser induced damage in optical coatings due to an incident pulse train 热激光由于入射脉冲串而引起光学涂层的损伤

Laser Damage Pub Date : 2021-10-12 DOI: 10.1117/12.2600793

Ryan McGuigan, H. Kessler

引用次数: 0

Investigation on the influence of the CO2 laser parameters on the defect healing process of fused silica CO2激光参数对熔融二氧化硅缺陷修复过程影响的研究

Laser Damage Pub Date : 2021-10-12 DOI: 10.1117/12.2618826

Zican Yang, H. Xu, Jian Cheng, Linjie Zhao, Mingjun Chen, Jinghe Wang, C. Tan, Yaguo Li, Zhichao Liu

{"title":"Investigation on the influence of the CO2 laser parameters on the defect healing process of fused silica","authors":"Zican Yang, H. Xu, Jian Cheng, Linjie Zhao, Mingjun Chen, Jinghe Wang, C. Tan, Yaguo Li, Zhichao Liu","doi":"10.1117/12.2618826","DOIUrl":"https://doi.org/10.1117/12.2618826","url":null,"abstract":"During the grinding and polishing processes of hard-brittle fused silica optics, the defects would be inevitably formed on the finished surface. Fused silica has a high absorption coefficient for far-infrared lasers, which makes the CO2 laser processing to be the potential repairing technology for machining-induced defects on fused silica surfaces. In this work, using a low-power CO2 laser, a new repairing method to heal the machining-induced micro-defects on the surface of fused silica is proposed. Then, based on the nonlinear thermodynamic parameters of fused silica material, a thermal transfer model under CO2 laser irradiation and a dynamic defect healing model were established. On basis of that, the influence of CO2 laser parameters on the maximum surface temperature and the temperature distribution inside the silica material was investigated. It is found that, under the low-power and near-continuous CO2 laser irradiation, the maximum melting depth can be obtained under the non-evaporative condition. The defect healing process under various laser powers was explored as well. It is found that the defects would be more difficult to be healed under a laser with higher-power, smaller beam size or shorter pulse width. This work can provide theoretical guidance for the determination of the optimal parameters in the laser healing process and the optical manufacturing strategies of fused silica optics.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123931949","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

Ultraviolet fatigue testing of laser optics 激光光学的紫外疲劳试验

Laser Damage Pub Date : 2021-10-12 DOI: 10.1117/12.2598678

M. Dabney, B. Arnold, Cyrus Rashvand

引用次数: 1

Laser damage metrology with small and large beams on a unique testbed 在一个独特的试验台上用小光束和大光束进行激光损伤测量

Laser Damage Pub Date : 2021-10-12 DOI: 10.1117/12.2598918

L. Lamaignère, C. Bouyer, M. Veinhard, R. Parreault, J. Natoli

引用次数: 0

Particle simulation of the initial dynamic damage behaviors of KDP crystals under intense laser irradiation 强激光照射下KDP晶体初始动态损伤行为的粒子模拟

Laser Damage Pub Date : 2021-10-12 DOI: 10.1117/12.2618830

Jian Cheng, Dinghuai Yang, Li Lai, Mingjun Chen, Jinghe Wang, Hao Yang, Linjie Zhao, Qi Liu, Wenyu Ding, Zhichao Liu

{"title":"Particle simulation of the initial dynamic damage behaviors of KDP crystals under intense laser irradiation","authors":"Jian Cheng, Dinghuai Yang, Li Lai, Mingjun Chen, Jinghe Wang, Hao Yang, Linjie Zhao, Qi Liu, Wenyu Ding, Zhichao Liu","doi":"10.1117/12.2618830","DOIUrl":"https://doi.org/10.1117/12.2618830","url":null,"abstract":"Potassium dihydrogen phosphate (KDP) crystal has been regarded as the solely irreplaceable component in laser-driven inertial confinement fusion (ICF) facilities. Nevertheless, the laser-induced damage on KDP crystal surfaces under highenergy laser irradiation considerably restricts the output power of ICF facilities. The laser damage event on KDP surface is an extremely complex process, among which the non-heat initial energy deposition is regarded as the major absorbed energy source, determining the subsequent thermal damage process and final damage morphology. The initial energy deposition process is a non-heat stage, where the plasmas are generated from ionization processes under intense laser irradiation. However, there is still no available model that can well reproduce the dynamic interaction behaviors between the high-energy laser and plasmas in the initial energy deposition process, resulting in the laser-induced damage mechanisms on KDP crystal surface still not fully revealed. In this work, a Particle-In-Cell (PIC) model is established to investigate the initial dynamic damage behaviors of KDP crystals under intense laser irradiation. On basis of this model, the crater formation process and the particle ejection dynamics involved in the laser damage event are reproduced. The reproduced characteristic parameters of laser damage craters on KDP input and output surfaces, and the obtained particle ejection angles are consistent with the previously reported laser damage morphology, which verifies the effectiveness of the established PIC model. This work could provide theoretical means for investigating the initial energy deposition process and also offer further insights in understanding the laser-induced damage mechanisms of KDP crystal components.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131276223","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

Low absorption metrology of thin film optical components for high power continuous wave lasers 高功率连续波激光器薄膜光学元件的低吸收计量

Laser Damage Pub Date : 2021-09-12 DOI: 10.1117/12.2642761

Camille Petite, Jeanne Graisset, A. Moreau, H. Krol, C. Grèzes-besset, J. Lumeau, L. Gallais

引用次数: 0

Laser damage comparisons of E-beam evaporated HfO2/SiO2 antireflection coatings at 0% and 40% relative humidity for 532 nm and 1064 nm 相对湿度为0%和40%时，532 nm和1064 nm下电子束蒸发HfO2/SiO2增透涂层的激光损伤比较

Laser Damage Pub Date : 2021-09-01 DOI: 10.1117/12.2598613

E. Field, B. Galloway, M. Geissel, D. Kletecka, P. Rambo, I. Smith, J. Porter

{"title":"Laser damage comparisons of E-beam evaporated HfO2/SiO2 antireflection coatings at 0% and 40% relative humidity for 532 nm and 1064 nm","authors":"E. Field, B. Galloway, M. Geissel, D. Kletecka, P. Rambo, I. Smith, J. Porter","doi":"10.1117/12.2598613","DOIUrl":"https://doi.org/10.1117/12.2598613","url":null,"abstract":"Antireflection coatings, containing alternating layers of hafnia (HfO2) and silica (SiO2), were deposited using electron beam (e-beam) evaporation for use in laser operations at 532 nm and 1064 nm in the nanosecond regime. The e-beam evaporation process produces coatings that are porous and therefore absorb water from the ambient environment. Consequently, humidity may affect the spectral performance of the coatings, and the laser damage resistance of the coatings may be affected as well. The purpose of this study was to compare the laser-induced damage thresholds of the antireflection coatings measured in the ambient environment at 0% and 40.5% relative humidity. At 1064 nm, the laserinduced damage thresholds at 0% and 40.5% relative humidity were almost the same. However, at 532 nm, the laserinduced damage thresholds at 40.5% relative humidity were nearly twice as high as those measured at 0% relative humidity. This indicates that humidity can inhibit lower-fluence precursors that would lead to laser damage at 532 nm in the nanosecond regime, thereby improving the durability of the coatings in a humid environment.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116782915","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

2D dynamic ionization simulation from ultrashort pulses in multilayer dielectric interference coatings 多层介质干涉涂层中超短脉冲的二维动态电离模拟

Laser Damage Pub Date : 2020-11-09 DOI: 10.1117/12.2571081

Simin Zhang, A. Davenport, N. Talisa, Joseph R. Smith, C. Menoni, V. Gruzdev, E. Chowdhury

引用次数: 4

Dealing with LMJ final optics damage: post-processing and models LMJ最终光学损伤的处理:后处理和模型

Laser Damage Pub Date : 2020-11-09 DOI: 10.1117/12.2571074

C. Lacombe, Guillaume Hallo, M. Sozet, P. Fourtillan, R. Diaz, S. Vermersch, J. Néauport

引用次数: 6

532-nm, nanosecond laser mirror thin film damage competition 532nm，纳秒激光反射薄膜损伤竞赛

Laser Damage Pub Date : 2020-11-09 DOI: 10.1117/12.2566691

R. Negres, C. Stolz, G. Batavičiūtė, A. Melninkaitis

引用次数: 2