scholarly journals A novel laser shock post-processing technique on the laser-induced damage resistance of 1ω HfO2/SiO2 multilayer coatings

2021 ◽  
Vol 9 ◽  
Author(s):  
Tangyang Pu ◽  
Wenwen Liu ◽  
Yueliang Wang ◽  
Xiaoming Pan ◽  
Leiqing Chen ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Processing Parameters ◽  
Processing Technique ◽  
Plasma Pressure ◽  
Multilayer Coatings ◽  
Laser Shock ◽  
Post Processing ◽  
Laser Shock Processing ◽  
Damage Resistance ◽  
Laser Induced Damage

Abstract The laser shock processing implemented by a laser-induced high-pressure plasma which propagates into the sample as a shockwave is innovatively applied as a post-processing technique on HfO2/SiO2 multilayer coatings for the first time. The pure mechanical post-processing has provided evidence of a considerable promotion effect of the laser-induced damage threshold, which increased by a factor of about 4.6 with appropriate processing parameters. The promotion mechanism is confirmed to be the comprehensive modification of the intrinsic defects and the mechanical properties, which made the applicability of this novel post-processing technique on various types of coatings possible. Based on experiments, an interaction equation for the plasma pressure is established, which clarifies the existence of the critical pressure and provides a theoretical basis for selecting optimal processing parameters. In addition to the further clarification of the underlying damage mechanism, the laser shock post-processing provides a promising technique to realize the comprehensive and effective improvement of the laser-induced damage resistance of coatings.

Influence of Laser-Conditioning on Laser-Induced Damage Properties of ZnSe Thin Films

2012 ◽  
Vol 602-604 ◽  
pp. 1437-1443
Author(s):  
Feng Zou ◽  
Jun Qi Xun ◽  
Jun Hong Su ◽  
Jian Bo Ma
Keyword(s):  
Thin Films ◽  
Energy Density ◽  
Wave Length ◽  
Single Layer ◽  
Damage Threshold ◽  
Processing Parameters ◽  
Spot Size ◽  
Pulse Number ◽  
Optical Films ◽  
Laser Induced Damage

With the development of high power laser systems, laser protection of optical components becomes more and more important. In order to enhance the laser-induced damage capability of optical films components, besides advanced methods and processes, post-treatment has significant influence on the laser-induced damage threshold (LIDT) of thin films. Q switch Nd:YAG laser of the working wave length at 1064nm, was used to post process on ZnSe single layer films with thickness of /2 (=1064nm) deposited by thermal evaporation, and the laser-induced damage and optical properties were investigated. By changing the energy density and pulse number under the spot size remained a fixed value, their effects on thin films damage threshold were studied respectively, the optimal processing parameters were obtained: energy density is 3.0 J/cm2 and pulse number is 1.The LIDT of post processed ZnSe films was improved from 5.0J/cm2 to 8.2J/cm2.

Laser Shock Processing as a Method for the Improvement of Metallic Materials Surface Properties: A Discussion on the Influence of Combined Mechanical and Thermal Effects

2007 ◽  
Vol 539-543 ◽  
pp. 1116-1121 ◽  
Author(s):  
J.L. Ocaña ◽  
Miguel Morales ◽  
C. Molpeceres ◽  
J.A. Porro ◽  
A. García-Beltrán
Keyword(s):  
Residual Stresses ◽  
Processing Technique ◽  
Point Of View ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Corrosion Properties ◽  
Laser Plasma Interaction ◽  
Life Improvement ◽  
Stress And Deformation ◽  
Shock Processing

Laser shock processing (LSP) has been presented as an effective technology for improving surface mechanical and corrosion properties of metals, and is being developed as a practical process amenable to production engineering. The main acknowledged advantages of the laser shock processing technique consist on its capability of inducing a relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly, the life improvement of the treated specimens against wear, crack growth and stress corrosion cracking. In the present paper, practical results at laboratory scale on the application of Laser Shock Processing are presented showing the obtained tensile residual stresses relaxation along with corresponding preliminary results about the resulting mechanical properties improvement induced by the treatment. Additionally, the influence of different irradiation parameters will be presented along with a physical interpretation of the mechanical effects induced in the materials by the characteristic fast laser-plasma interaction regime occurring in the process and model based assessments on the real possibilities of the technique as a substitutive of traditional techniques as, for example, shot peening. From a specific point of view, a critical analysis of the relative influences of coupled thermal and mechanical stress and deformation effects during LSP is presented.

scholarly journals Study on the Absorption Characteristics and Laser Damage Properties of Fused Silica Optics under Flexible Polishing and Shallow DCE Process

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1226
Author(s):  
Wanli Zhang ◽  
Feng Shi ◽  
Ci Song ◽  
Ye Tian ◽  
Yongxiang Shen
Keyword(s):  
Chemical Etching ◽  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Laser Damage ◽  
Damage Resistance ◽  
Etching Depth ◽  
Treatment Processes ◽  
Laser Induced Damage ◽  
Combined Technique

The enhancement of laser damage resistance of fused silica optics was a hotspot in scientific research. At present, a variety of modern processes have been produced to improve the laser induced damage threshold (LIDT) of fused silica optics. They included pre-treatment processes represented by flexible computer controlled optical surfacing (CCOS), magnetorheological finishing (MRF), ion beam finishing (IBF), and post-treatment processes represented by dynamic chemical etching (DCE). These have achieved remarkable results. However, there are still some problems that need to be solved urgently, such as excessive material removal, surface accuracy fluctuation in the DCE process, and the pollution in MRF process, etc. In view of above problems, an MRF, CCOS, IBF and shallow DCE combined technique was used to process fused silica optics. The surface morphology could be greatly controlled and chemical etching depth was reduced, while the LIDT increased steadily. After processing by this combined technique, the LIDT increased to 12.1 J/cm2 and the laser damage resistance properties of fused silica were significantly enhanced. In general, the MRF, IBF, CCOS and shallow DCE combined technique brought much help to the enhancement of laser damage resistance of fused silica, and could be used as a process route in the manufacturing process of fused silica.

scholarly journals Effects of Ion Beam Etching on the Nanoscale Damage Precursor Evolution of Fused Silica

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1294
Author(s):  
Yaoyu Zhong ◽  
Yifan Dai ◽  
Feng Shi ◽  
Ci Song ◽  
Ye Tian ◽  
...  
Keyword(s):  
Silica Surface ◽  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Structural Defects ◽  
Laser Damage ◽  
Material Structure ◽  
Ion Beam Etching ◽  
Damage Resistance ◽  
Laser Induced Damage

Nanoscale laser damage precursors generated from fabrication have emerged as a new bottleneck that limits the laser damage resistance improvement of fused silica optics. In this paper, ion beam etching (IBE) technology is performed to investigate the evolutions of some nanoscale damage precursors (such as contamination and chemical structural defects) in different ion beam etched depths. Surface material structure analyses and laser damage resistance measurements are conducted. The results reveal that IBE has an evident cleaning effect on surfaces. Impurity contamination beneath the polishing redeposition layer can be mitigated through IBE. Chemical structural defects can be significantly reduced, and surface densification is weakened after IBE without damaging the precision of the fused silica surface. The photothermal absorption on the fused silica surface can be decreased by 41.2%, and the laser-induced damage threshold can be raised by 15.2% after IBE at 250 nm. This work serves as an important reference for characterizing nanoscale damage precursors and using IBE technology to increase the laser damage resistance of fused silica optics.

Experimental Study of the Surface of Steel 15Kh13MF after the Nanosecond Laser Shock Processing

2013 ◽  
Vol 200 ◽  
pp. 60-65 ◽  
Author(s):  
Pavlo Maruschak ◽  
Islam Zakiev ◽  
Vitaly Mocharsky ◽  
Yuriy Nikiforov
Keyword(s):  
Experimental Study ◽  
Surface Morphology ◽  
Laser Irradiation ◽  
Laser Treatment ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

The influence of processing parameters on the morphology of periodical structures on surface of steel 15Kh13MF after the nanosecond laser irradiation are discussed and analyzed. Modification of microstructure, surface morphology, and hardness by laser treatment is discussed

scholarly journals Properties of Hafnium and Aluminium Silicates Coatings Obtained by PLD

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 753
Author(s):  
Eduard N. Sirjita ◽  
Laurentiu Rusen ◽  
Simona Brajnicov ◽  
Cristina Craciun ◽  
Valentin Ion ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Damage Threshold ◽  
Processing Technique ◽  
Laser Wavelength ◽  
Hafnium Silicate ◽  
Vis Spectroscopy ◽  
Laser Induced Damage ◽  
Silicate Layers ◽  
Aluminium Silicate

We report on the deposition and characterization of hafnium silicate and aluminium silicate thin films for different applications in optics and electronics. Pulsed laser deposition in a controllable oxygen atmosphere was used as a processing technique, with optimized parameters in terms of laser wavelength, laser fluence and oxygen pressure. The thin films were investigated using atomic force microscopy, spectroscopic ellipsometry, UV–VIS spectroscopy and X-ray photoelectron spectroscopy. The morphological investigations evidenced uniform layers with low roughness (in the order of nanometres). The optical investigations revealed that aluminium silicate layers with low roughness and low absorption in the infrared (IR) range can be obtained at high substrate temperatures (600 °C). The behaviour of the silicate thin films with respect to the nanosecond IR laser irradiation revealed that aluminium silicate layers have higher laser-induced damage threshold values in comparison with hafnium silicate.

Effect of Laser Shock Processing Parameters on Residual Principal Stresses and Its Directions of 2024 Aluminum Alloy

2012 ◽  
Vol 39 (1) ◽  
pp. 0103006
Author(s):  
聂贵锋 Nie Guifeng ◽  
冯爱新 Feng Aixin ◽  
任旭东 Ren Xudong ◽  
曹宇鹏 Cao Yupeng ◽  
周鹏程 Zhou Pengcheng ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Processing Parameters ◽  
Laser Shock ◽  
Principal Stresses ◽  
Laser Shock Processing ◽  
2024 Aluminum Alloy ◽  
Shock Processing

Effect of laser shock processing on water adsorption of electron-beam deposited multilayer coatings

2021 ◽  
Vol 117 ◽  
pp. 111143
Author(s):  
Tangyang Pu ◽  
Wenwen Liu ◽  
Yueliang Wang ◽  
Xiaoming Pan ◽  
Leiqing Chen
Keyword(s):  
Electron Beam ◽  
Water Adsorption ◽  
Multilayer Coatings ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Effects of processing parameters on fatigue properties of LY2 Al alloy subjected to laser shock processing

2011 ◽  
Vol 9 (6) ◽  
pp. 061406-61409 ◽  
Author(s):  
张磊 Lei Zhang ◽  
鲁金忠 Jinzhong Lu ◽  
张永康 Yongkang Zhang ◽  
罗开玉 Kaiyu Luo ◽  
戴峰泽 Fengze Dai ◽  
...  
Keyword(s):  
Processing Parameters ◽  
Fatigue Properties ◽  
Al Alloy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

scholarly journals Impact of the Polishing Suspension Concentration on Laser Damage of Classically Manufactured and Plasma Post-Processed Zinc Crown Glass Surfaces

2018 ◽  
Vol 8 (9) ◽  
pp. 1556 ◽  
Author(s):  
Christoph Gerhard ◽  
Marco Stappenbeck
Keyword(s):  
Damage Threshold ◽  
Surface Contamination ◽  
Laser Damage ◽  
Surface Finishing ◽  
Process Conditions ◽  
Post Processing ◽  
Suspension Concentration ◽  
Laser Induced Damage ◽  
Glass Surfaces ◽  
The Impact

The laser-induced damage threshold of optics is an issue of essential importance in high-power laser applications. However, the complex and partially interacting mechanisms as well as the underlying reasons for laser damage of glass surfaces are not yet fully understood. The aim of the present work is to contribute to a better understanding of such damage mechanisms by providing original results on the impact of classical glass surface machining on the laser-induced damage threshold. For this purpose, glass samples were prepared with well-defined process conditions in terms of the used lapping and polishing agents and suspensions. Further, the samples were post-processed by atmospheric pressure plasma for precision cleaning. The laser-induced damage threshold and surface contamination by residues from the manufacturing process were determined before and after plasma post-processing. It is shown that the polishing suspension concentration has a certain impact on the laser-induced damage threshold and surface contamination by residues from used working materials. The highest damage threshold of 15.2 J/cm² is found for the lowest surface contamination by carbon which occurs in the case of the highest polishing suspension concentration. After plasma treatment for merely 60 s, this value was increased to 20.3 J/cm² due to the removal of surface-adherent carbon. The results thus imply that the laser-induced damage threshold can notably be increased by first choosing appropriate process parameters during classical manufacturing and second plasma post-processing for surface finishing.

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