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The Role Of Phase Instabilities In The Early Material Response During Laser Induced Breakdown In Bulk Fused Silica
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Book Synopsis The Role of Phase Instabilities in the Early Material Response During Laser-induced Breakdown in Bulk Fused Silica by :
Download or read book The Role of Phase Instabilities in the Early Material Response During Laser-induced Breakdown in Bulk Fused Silica written by and published by . This book was released on 2011 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Material Science And Engineering - Proceedings Of The 2016 International Conference (Amse2016) by : Dahai Ren
Download or read book Advanced Material Science And Engineering - Proceedings Of The 2016 International Conference (Amse2016) written by Dahai Ren and published by World Scientific. This book was released on 2016-05-24 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a comprehensive overview of the authors' works which include significant discoveries and pioneering contributions on Materials Process Engineering, Materials Physics and Chemistry, Emerging Areas of Materials Science, and so on. AMSE2016 is an influential international conference for its strong organization team, dependable reputation and a wide range of sponsors from all over the world.
Book Synopsis Comparison of Material Response in Fused Silica and KDP Following Exit Surface Laser-induced Breakdown by :
Download or read book Comparison of Material Response in Fused Silica and KDP Following Exit Surface Laser-induced Breakdown written by and published by . This book was released on 2013 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetics of Ejected Particles During Laser-Induced Breakdown in Fused Silica by :
Download or read book Kinetics of Ejected Particles During Laser-Induced Breakdown in Fused Silica written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Imaging the Early Material Response Associated with Exit Surface Damage in Fused Silica by :
Download or read book Imaging the Early Material Response Associated with Exit Surface Damage in Fused Silica written by and published by . This book was released on 2010 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The processes involved at the onset of damage initiation on the surface of fused silica have been a topic of extensive discussion and thought for more than four decades. Limited experimental results have helped develop models covering specific aspects of the process. In this work we present the results of an experimental study aiming at imaging the material response from the onset of the observation of material modification during exposure to the laser pulse through the time point at which material ejection begins. The system involves damage initiation using a 355 nm pulse, 7.8 ns FWHM in duration and imaging of the affected material volume with spatial resolution on the order of 1 [mu]m using as strobe light a 150 ps laser pulse that is appropriately timed with respect to the pump pulse. The observations reveal that the onset of material modification is associated with regions of increased absorption, i.e., formation of an electronic excitation, leading to a reduction in the probe transmission to only a few percent within a time interval of about 1 ns. This area is subsequently rapidly expanding with a speed of about 1.2 [mu]m/ns and is accompanied by the formation and propagation of radial cracks. These cracks appear to initiate about 2 ns after the start of the expansion of the modified region. The damage sites continue to grow for about 25 ns but the mechanism of expansion after the termination of the laser pulse is via formation and propagation of lateral cracks. During this time, the affected area of the surface appears to expand forming a bulge of about 40 [mu]m in height. The first clear observation of material cluster ejection is noted at about 50 ns delay.
Book Synopsis 1.06 ?m Laser-Induced Breakdown of CO2-Laser-Polished Fused SiO2 by : PA. Temple
Download or read book 1.06 ?m Laser-Induced Breakdown of CO2-Laser-Polished Fused SiO2 written by PA. Temple and published by . This book was released on 1981 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fused silica surfaces have been treated with continuous wave CO2-laser radiation in an improved raster technique. Laser damage data for 1.06-?m, 9-nsec, small-spot irradiation are presented. It is shown that a reasonably sharp transition from laser damage prone to laser damage resistant surfaces takes place over a small CO2-laser power range. The transition to high damage resistance takes place at a silica surface temperature where material flow begins to take place, as evidenced by the onset of residual strain in the CO2-processed part. These data are taken as evidence that microcrack healing is an important mechanism in increased damage resistance in CO2-polished parts. Also presented are data which show that CO2-treated surfaces have a small-spot damage threshold at least as high as the bulk damage threshold of SiO2. In addition, these treated parts show no obvious change in surface appearance, as seen in total internal reflection microscopy. They also show little change in transmissive figure. It is suggested that uniform preheating be used to eliminate the strain presently seen in CO2-treated parts.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Transformations and Material Instabilities in Solids by : Morton E. Gurtin
Download or read book Phase Transformations and Material Instabilities in Solids written by Morton E. Gurtin and published by . This book was released on 1984 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Surface Processing Methods on the Laser Induced Damage Threshold of Fused Silica by : Weiran Duan
Download or read book The Effect of Surface Processing Methods on the Laser Induced Damage Threshold of Fused Silica written by Weiran Duan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis UV-laser-induced Densification of Fused Silica by : Lianqing Zheng
Download or read book UV-laser-induced Densification of Fused Silica written by Lianqing Zheng and published by . This book was released on 2004 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Transformations and Ablation in Laser-Treated Solids by : Emil N. Sobol
Download or read book Phase Transformations and Ablation in Laser-Treated Solids written by Emil N. Sobol and published by Wiley-Interscience. This book was released on 1995-02-06 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uses a unified standpoint to describe the principal physical processes that determine the possibility and practical effectiveness of utilizing lasers for the modification and ablation of solids. Analyzes the general mechanisms and laws operative in the course of laser treatment of various materials including metal alloys, rocks, oxides, high-temperature superconductors and hard biological tissues. The chapters on laser-induced solid state thermochemical reactions and phase transitions in high-temperature superconductors under laser radiation break new ground.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Defects Induced in Fused Silica by High Power UV Laser Pulses at 355 Nm by :
Download or read book Defects Induced in Fused Silica by High Power UV Laser Pulses at 355 Nm written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Point defects induced in high quality optical-grade based silica by high power (>30 J/cm2) 355 nm laser pulses have been investigated to elucidate the nature of laser damage in transparent optics designed for use at the National Ignition Facility (NIF). Six defects have been identified: the NBOHC (non-bridging oxygen hole center), a STE (self-trapped exciton), an ODC (oxygen-deficient center), interstitial oxygen, the E'{sub {gamma}}, and E'--4. The former four defects were identified and spatially resolved in the damage craters using cathodoluminescence (CL) microanalysis (spectroscopy and microscopy). The latter two defects were identified using ESR spectroscopy at cryogenic temperatures. These defects are unlikely to be a prime factor in damage growth by subsequent laser pulses. Their concentration is too low to effect a high enough temperature rise by a volume absorption mechanism.
Book Synopsis Nonlinear Material Response to Very Rapid Energy Deposition by : Y. M. Gupta
Download or read book Nonlinear Material Response to Very Rapid Energy Deposition written by Y. M. Gupta and published by . This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a research effort to examine the nonlinear response of selected materials to rapid energy deposition are summarized. One part of the work focused on examining the response of brittle solids to plane shock waves. The other part of the work focused on understanding the mechanisms for laser energy deposition in transparent dielectrics. The shock wave effort has demonstrated the usefulness of making shear wave measurements for characterizing the shocked state. In fused silica, these measurements led to the finding of reversible, shear enhanced compaction and to a direct determination of stress deviators in the shocked state. The work on polycrystalline calcite represents the first study to use shear wave measurements to understand shock induced phase changes. Shear modulus decrease associated with the calcite transition was observed. The subsequent increase in shear modulus at higher compressions is surprising and, in conjunction with the longitudinal measurements, leads to the possibility that a phase other than calcite III is formed under shock loading. Subject terms: Shear measurements, Phase transitions, Shock waves, Lattice stress, Inelastic deformation, Multiple pulse, Laser damage, Transparent materials, Electron heating, Lattice defects. (jes).
Book Synopsis Laser Induced Damage in Optical Materials by :
Download or read book Laser Induced Damage in Optical Materials written by and published by . This book was released on 1994 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Induced Sub-Band Absorption as a Precursor to Optical Damage on Fused Silica Surfaces by :
Download or read book Fracture Induced Sub-Band Absorption as a Precursor to Optical Damage on Fused Silica Surfaces written by and published by . This book was released on 2010 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optical damage threshold of indentation induced flaws on fused silica surfaces was explored. Mechanical flaws were characterized by laser damaged testing, SEM, optical, and photoluminescence microscopy. Localized polishing, chemical etching, and the control of indentation morphology were used to isolate the structural features which limit optical damage. A thin defect layer on fracture surfaces, including those smaller than the wavelength of visible light, was found to be the dominant source of laser damage initiation during illumination with 355nm, 3ns laser pulses. Little evidence was found that either displaced or densified material or fluence intensification plays a significant role in optical damage at fluences>35J/cm2. Elimination of the defect layer was shown to increase the overall damage performance of fused silica optics.
Book Synopsis Sub-surface Mechanical Damage Distributions During Grinding of Fused Silica by :
Download or read book Sub-surface Mechanical Damage Distributions During Grinding of Fused Silica written by and published by . This book was released on 2005 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution and characteristics of surface cracking (i.e. sub-surface damage or SSD) formed during standard grinding processes has been investigated on fused silica glass. The SSD distributions of the ground surfaces were determined by: (1) creating a shallow (18-108 [mu]m) wedge/taper on the surface by magneto-rheological finishing; (2) exposing the SSD by HF acid etching; and (3) performing image analysis of the observed cracks from optical micrographs taken along the surface taper. The observed surface cracks are characterized as near-surface lateral and deeper trailing indent type fractures (i.e., chatter marks). The SSD depth distributions are typically described by a single exponential distribution followed by an asymptotic cutoff in depth (c{sub max}). The length of the trailing indent is strongly correlated with a given process. Using established fracture indentation relationships, it is shown that only a small fraction of the abrasive particles are being mechanically loaded and causing fracture, and it is likely the larger particles in the abrasive particle size distribution that bear the higher loads. The SSD depth was observed to increase with load and with a small amount of larger contaminant particles. Using a simple brittle fracture model for grinding, the SSD depth distribution has been related to the SSD length distribution to gain insight into ''effective'' size distribution of particles participating in the fracture. Both the average crack length and the surface roughness were found to scale linearly with the maximum SSD depth (c{sub max}). These relationships can serve as useful rules-of-thumb for nondestructively estimating SSD depth and to identify the process that caused the SSD. In certain applications such as high intensity lasers, SSD on the glass optics can serve as a reservoir for minute amounts of impurities that absorb the high intensity laser light and lead to subsequent laser-induced surface damage. Hence a more scientific understanding of SSD formation can provide a means to establish recipes to fabricate SSD-free, laser damage resistant optical surfaces.
