Laser Damage最新文献_第3页

All-glass metasurface laser optics for lensing, antireflections, and waveplates 用于透镜、抗反射和波峰板的全玻璃超表面激光光学元件

Laser Damage Pub Date : 2023-11-24 DOI: 10.1117/12.2685561

Eyal Feigenbaum, N. Ray, Jae Hyuck Yoo, Hoang T. Nguyen, Michael A. Johnson

引用次数: 0

Influence of the multilayer dielectric design on the laser damage resistance of pulse-compression gratings 多层电介质设计对脉冲压缩光栅抗激光损伤能力的影响

Laser Damage Pub Date : 2023-11-24 DOI: 10.1117/12.2685304

Saaxewer Diop, Nicolas Bonod, M. Chorel, E. Lavastre, N. Roquin, Lilian Heymans, Pierre Brianceau, Laurent Gallais, L. Lamaignère

引用次数: 0

Sapphire optics for contamination resistance and extreme power density applications 蓝宝石光学器件，用于抗污染和极高功率密度应用

Laser Damage Pub Date : 2023-11-24 DOI: 10.1117/12.2685118

Sam Zilavy, Adam Argondizzo, Kyle Branigan, Gregg E. Davis

{"title":"Sapphire optics for contamination resistance and extreme power density applications","authors":"Sam Zilavy, Adam Argondizzo, Kyle Branigan, Gregg E. Davis","doi":"10.1117/12.2685118","DOIUrl":"https://doi.org/10.1117/12.2685118","url":null,"abstract":"The power available in many industrial high-power 1 µm laser-cutting systems now exceeds 10 kW. To take advantage of that power, systems must be fast and nimble in order to accurately trace toolpaths at high speed. These power levels drive focusing head designs to be compact and lightweight. The best way to achieve this, in general, is with an all-transmissive design consisting of lenses and windows. The industry-standard material for lenses is fused silica, which has extremely low absorption. However, should the lens become contaminated, the poor thermal conductivity of fused silica traps much of the absorbed power inside the optic, raising its temperature and index of refraction, which causes the focus of the system to shift back toward the focusing head. At some point, the amount of focus shift becomes unsuitable for material processing and the focusing head must be replaced or refurbished with clean optics. Sapphire is an alternative lens material that until recently was only used in windows due to optical fabrication challenges in the polishing of aspheric surfaces. At Coherent Corp., we have overcome many of those challenges and currently offer sapphire aspheres. The key advantage of sapphire over fused silica is its relatively high thermal conductivity. This enables any absorbed power to quickly reach the edge of a sapphire optic where water-cooled mounts can remove the heat and keep the lens temperature low. Accounting for all the property differences between the two materials, sapphire should result in less focus shift than a comparable fused silica optic with the same absorbed power. The purpose of this study is to measure and compare the focus shift properties of the two materials in a controlled setting at high and low levels of absorbed power. Sapphire was also tested for laser-induced-damage threshold (LIDT) by Spica Technologies Inc.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139241708","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

Pulse duration dependence of single-shot pulsed laser ablation of gallium based III-V compound semiconductors 镓基 III-V 族化合物半导体单次脉冲激光烧蚀的脉冲持续时间相关性

Laser Damage Pub Date : 2023-11-24 DOI: 10.1117/12.2685122

Marnix Vreugdenhil, Dries van Oosten

引用次数: 0

Damage mitigation in the Kagome hollow core fiber used for the delivery of short high-energy pulses 用于输送短高能脉冲的Kagome空心芯纤维的损伤缓解

Laser Damage Pub Date : 2022-12-05 DOI: 10.1117/12.2642773

Radek Poboril, J. Vanda, Martin Mydlář, Helena Picmausova, M. Smrž, T. Mocek

{"title":"Damage mitigation in the Kagome hollow core fiber used for the delivery of short high-energy pulses","authors":"Radek Poboril, J. Vanda, Martin Mydlář, Helena Picmausova, M. Smrž, T. Mocek","doi":"10.1117/12.2642773","DOIUrl":"https://doi.org/10.1117/12.2642773","url":null,"abstract":"This article is focused on the design of a beam delivery system based on hollow-core photonic crystal fiber. For our experiment, we chose a fiber with the Kagome structure developed by GLOphotonics. The central wavelength of the delivered beam was 1030 nm, so we chose the fiber PMC-C-Yb-7C. The first part of the article is a brief introduction to PERLA 100, the laser used for testing the efficiency of the beam delivery system developed by HiLASE Centre. The reader will be acquainted with the laser system parameters. The input beam parameters play an important role in the efficiency of focusing into the fiber. One of the key parameters is the M2 of the beam, as it has a direct effect on the size of the waist at the point of entry into the fiber. Another important parameter is the maximum energy in one pulse which can destroy the fiber structure. The size of the focusing point must match the size of the MFD of the fiber. Therefore, it is necessary to precisely define the size of the input beam into the focusing assembly with an accuracy of micrometers and to get rid of as many degrees of freedom as possible in the actual setup of the entire system. Another critical parameter is the size of the fiber input angle. The article aims to eliminate as many critical points as possible when setting up a focusing system and thus prevent damage to the fiber structure. One of the points is the simulation and calculation of the maximum possible loading of the fiber microstructure before its damage. With the help of gradual design modification, the aim is to achieve a coupling efficiency of more than 90 % by scaling the PERLA 100 output power from units of W up to 100 W.","PeriodicalId":202227,"journal":{"name":"Laser Damage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134343993","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

UV fatigue of laser optics: laser-induced contamination 激光光学的紫外疲劳:激光引起的污染

Laser Damage Pub Date : 2022-12-02 DOI: 10.1117/12.2638404

B. Arnold, Cyrus Rashvand, L. Willis, M. Dabney

引用次数: 1

Non-destructive testing of subsurface damage for early indication of laser-induced damage threshold in fused silica 熔融二氧化硅激光损伤阈值早期指示的亚表面损伤无损检测

Laser Damage Pub Date : 2022-12-02 DOI: 10.1117/12.2642749

Anne-Sophie Munser, M. Trost, C. Mühlig, Nora Tadewaldt, S. Kuhn, L. Coriand, Ulf Hallmeyer

引用次数: 0

LIDT testing as a tool for optimization of processing window for D263 glass sheet TGV treatment LIDT测试作为优化加工窗口的工具，用于D263玻璃片的TGV处理

Laser Damage Pub Date : 2022-12-02 DOI: 10.1117/12.2642866

J. Vanda, Martin Mydlář, Kateřina Pilná, H. Turčičova, Radek Poboril, J. Brajer, T. Mocek, B. Stoklasa, Stepan Venos