Journal Article10.1364/JOSAB.30.003233
Phase modulation and morphological evolution associated with surface-bound particle ablation
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TL;DR: In this paper, surface modification of fused silica windows caused by the ablation of surface-bound microparticles under short pulse laser irradiation was investigated and related to beam propagation effects.
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Abstract: Surface modification of fused silica windows caused by the ablation of surface-bound microparticles under short pulse laser irradiation is investigated and related to beam propagation effects. Particle material dispersal and subsequent surface pitting after multiple pulses of 351 nm, ∼9 J/cm2 laser light were found to depend strongly on material type and particle size. Surface pitting was most significant for opaque materials (aluminum, steel, acetal homopolymer), yielding pits as deep as 600 nm for ∼30 μm diameter particles. Transparent particles (PET polymer, glass) tended to disperse material more widely and caused less pitting (∼100 nm) than the opaque materials. Paraxial light propagation analysis showed that phase objects created by ablated opaque materials resulted in higher peak intensification (∼3x) than those created by transparent materials (∼1.5x). The fragmentation of ablated material is discussed in terms of brittle or ductile failure at high strain rates, indicating reasonable agreement between experiment and theory. An approximation for the laser-induced plasma pressure and size of the dispersal pattern is derived, indicating an inverse correlation with material density.
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Citations
Particle damage sources for fused silica optics and their mitigation on high energy laser systems
Jeffrey D. Bude,Christopher W. Carr,P. E. Miller,T. G. Parham,Pamela K. Whitman,Marcus V. Monticelli,Rajesh N. Raman,David A. Cross,Brian Welday,F. Ravizza,Tayyab I. Suratwala,J. Davis,M. Fischer,R. A. Hawley,H. Lee,Manyalibo J. Matthews,Mary A. Norton,Mike C. Nostrand,D. VanBlarcom,S. Sommer +19 more
TL;DR: It is demonstrated that the most dangerous sources of particle contamination in a system-level environment are laser-driven particle sources, and the mitigations demonstrated here are currently being employed for all large UV silica optics on the National Ignition Facility.
87
Mechanisms governing the interaction of metallic particles with nanosecond laser pulses
Stavros G. Demos,Raluca A. Negres,Rajesh N. Raman,Nan Shen,Alexander M. Rubenchik,Manyalibo J. Matthews +5 more
TL;DR: Analysis of the experimental results suggests that the induced kinetic properties of the particle can be adequately described using the concept of momentum coupling introduced to explain the interaction of plane metal targets to large-aperture laser beams.
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Model laser damage precursors for high quality optical materials
TL;DR: It is demonstrated that strong interfacial adhesion strength between absorbers and silica is crucial for the launch of an absorption front and subsequent damage initiation, and the absorption-front model is performed and agree qualitatively with experimental results.
58
Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces
TL;DR: Time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of metallic particles bound to transparent substrates.
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Impact of laser-contaminant interaction on the performance of the protective capping layer of 1 ω high-reflection mirror coatings.
S. R. Qiu,Mary A. Norton,Rajesh N. Raman,Alexander M. Rubenchik,Charles D. Boley,Amy L. Rigatti,Paul B. Mirkarimi,Christopher J. Stolz,Manyalibo J. Matthews +8 more
TL;DR: It is argued that a high-temperature thermal field from plasma generated by the laser-particle interaction above a critical fluence is responsible for the surface modification of each capping layer.
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The spall strength of condensed matter
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Shock waves from a water-confined laser-generated plasma
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Laser‐cleaning techniques for removal of surface particulates
TL;DR: In this paper, it was shown that laser cleaning with highest efficiency is achieved by choosing a laser wavelength that is strongly absorbed by the surface together with pulse depositing a water film of thickness on the order of microns on the surface momentarily before the pulsed laserirradiation.
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Invariance of the Dissipative Action at Ultrahigh Strain Rates Above the Strong Shock Threshold
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