Cathodoluminescence Microanalysis Of The Distribution Of Defects Induced In Fused Silica By Uv Laser Pulses And After Damage Mitigation Treatment With A Co2 Laser

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Cathodoluminescence Microanalysis of the Distribution of Defects Induced in Fused Silica by UV Laser Pulses and After Damage Mitigation Treatment with a CO2 Laser

Author :
Publisher :
ISBN 13 :
Total Pages : 113519 pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Cathodoluminescence Microanalysis of the Distribution of Defects Induced in Fused Silica by UV Laser Pulses and After Damage Mitigation Treatment with a CO2 Laser by :

Download or read book Cathodoluminescence Microanalysis of the Distribution of Defects Induced in Fused Silica by UV Laser Pulses and After Damage Mitigation Treatment with a CO2 Laser written by and published by . This book was released on 2004 with total page 113519 pages. Available in PDF, EPUB and Kindle. Book excerpt: Point defects are induced in high quality optical-grade fused silica by high fluence (>30 J/cm2) 355nm laser pulses. The microscopic depth distribution of laser irradiation induced defects has been nondestructively determined using Cathodoluminescence (CL) microanalysis. CL emissions have been observed at 1.9eV, 2.2eV, 2.7eV and 4.4eV. In addition following CO2 laser treatment for damage mitigation an emission at 3.2eV is also observed. The CL emissions have been identified with the NBOHC (non-bridging oxygen hole center), the STE (self-trapped exciton), an ODC (oxygen-deficient center) and an aluminum impurity centre. The spatially resolved CL data is consistent with damage initiation at the exit surface. The concentration of 355 nm laser induced defects is greatest at the surface and monotonically decays to pre-irradiation levels at ≈10 [mu]m depth below the surface. With CO2 processing to mitigate damage, the defect concentration and spatial distribution is reduced to a maximum depth of ≈6[mu]m. CL microanalysis provides a sensitive and nondestructive method of assessing the magnitude and submicron distribution of irradiation induced damage in technologically important materials.

Defects Induced in Fused Silica by High Power UV Laser Pulses at 355 Nm

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (682 download)

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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.

Structural Modifications in Fused Silica Due to Laser Damage Induced Shock Compression

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (682 download)

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Book Synopsis Structural Modifications in Fused Silica Due to Laser Damage Induced Shock Compression by :

Download or read book Structural Modifications in Fused Silica Due to Laser Damage Induced Shock Compression written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High power laser pulses can produce damage in high quality fused silica optics that can lead to its eventual obscuration and failure. Current models suggest the initiation of a plasma detonation due to absorbing initiators and defects, leading to the formation of shock waves. Recent experiments have found a densified layer at the bottom of damage sites, as evidence of the laser-damage model. We have studied the propagation of shock waves through fused silica using molecular dynamics. These simulations show drastic modifications in the structure and topology of the network, in agreement with experimental observations.

Fracture Induced Sub-Band Absorption as a Precursor to Optical Damage on Fused Silica Surfaces

Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (727 download)

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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.

The Effect of Surface Processing Methods on the Laser Induced Damage Threshold of Fused Silica

Author : Weiran Duan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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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:

Crack Propagation in Fused Silica During UV and IR Ns-laser Illumination

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Crack Propagation in Fused Silica During UV and IR Ns-laser Illumination by :

Download or read book Crack Propagation in Fused Silica During UV and IR Ns-laser Illumination written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Mechanism of Radiation Induced Densification in Fused Silica

Author : Fan Piao
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis The Mechanism of Radiation Induced Densification in Fused Silica by : Fan Piao

Download or read book The Mechanism of Radiation Induced Densification in Fused Silica written by Fan Piao and published by . This book was released on 1999 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Thermally Induced Refractive Index Change in Fused Silica Due to CO2 Laser Processing

$Download Thermally Induced Refractive Index Change in Fused Silica Due to CO2 Laser Processing PDF Online Free$

Author : James Jason Sullivan
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (622 download)

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Book Synopsis Thermally Induced Refractive Index Change in Fused Silica Due to CO2 Laser Processing by : James Jason Sullivan

Download or read book Thermally Induced Refractive Index Change in Fused Silica Due to CO2 Laser Processing written by James Jason Sullivan and published by . This book was released on 2005 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Imaging the Early Material Response Associated with Exit Surface Damage in Fused Silica

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Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (873 download)

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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.

Sub-surface Mechanical Damage Distributions During Grinding of Fused Silica

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ISBN 13 :
Total Pages : 33 pages
Book Rating : 4.:/5 (871 download)

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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.

Damage to Fused Silica Windows While Under Simultaneous Exposure to Flowing Solvents and Laser Radiation at 308 Nm

Author : Folryn, SR.
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Damage to Fused Silica Windows While Under Simultaneous Exposure to Flowing Solvents and Laser Radiation at 308 Nm by : Folryn, SR.

Download or read book Damage to Fused Silica Windows While Under Simultaneous Exposure to Flowing Solvents and Laser Radiation at 308 Nm written by Folryn, SR. and published by . This book was released on 1988 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports the results of a study to determine the degrading effects of flowing dye solvents on the laser damage threshold of fused-silica windows at 308 nm. Thresholds were measured at the SiO2solvent interface in a test cell. Bare SiO2 tested in air at 308 nm (20 ns) typically exhibits a threshold ranging from 4 to 10 J/cm2; with the solvent cyclohexane in contact, a threshold as low as 0.3 J/cm2 was measured. The damage data indicate that window lifetime (number of shots) is independent of fluence at higher levels, and asymptotically approaches infinity at levels near threshold. Dielectric coatings were tested as possible damage-resistant barriers between the solvent and SiO2; the results show some improvement in damage threshold. When cyclohexane is replaced with the solvent dioxane, thresholds measured for SiO2 windows are within the range cited above for thresholds measured in air.

Surface and Thin Film Analysis

Author : Gernot Friedbacher
Publisher : Wiley-VCH
ISBN 13 : 9783527320479
Total Pages : 0 pages
Book Rating : 4.3/5 (24 download)

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Book Synopsis Surface and Thin Film Analysis by : Gernot Friedbacher

Download or read book Surface and Thin Film Analysis written by Gernot Friedbacher and published by Wiley-VCH. This book was released on 2011-06-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveying and comparing all techniques relevant for practical applications in surface and thin film analysis, this second edition of a bestseller is a vital guide to this hot topic in nano- and surface technology. This new book has been revised and updated and is divided into four parts - electron, ion, and photon detection, as well as scanning probe microscopy. New chapters have been added to cover such techniques as SNOM, FIM, atom probe (AP),and sum frequency generation (SFG). Appendices with a summary and comparison of techniques and a list of equipment suppliers make this book a rapid reference for materials scientists, analytical chemists, and those working in the biotechnological industry. From a Review of the First Edition (edited by Bubert and Jenett) "... a useful resource..." (Journal of the American Chemical Society)

Scanning Electron Microscopy

Author : Ludwig Reimer
Publisher : Springer
ISBN 13 : 3540389679
Total Pages : 538 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Scanning Electron Microscopy by : Ludwig Reimer

Download or read book Scanning Electron Microscopy written by Ludwig Reimer and published by Springer. This book was released on 2013-11-11 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning Electron Microscopy provides a description of the physics of electron-probe formation and of electron-specimen interactions. The different imaging and analytical modes using secondary and backscattered electrons, electron-beam-induced currents, X-ray and Auger electrons, electron channelling effects, and cathodoluminescence are discussed to evaluate specific contrasts and to obtain quantitative information.

Cathodoluminescence in Geosciences

Author : M. Pagel
Publisher : Springer Science & Business Media
ISBN 13 : 3662040867
Total Pages : 518 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Cathodoluminescence in Geosciences by : M. Pagel

Download or read book Cathodoluminescence in Geosciences written by M. Pagel and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date overview of cathodoluminescence microscopy and spectroscopy in the field of geosciences, including new important data on cathodoluminescence spectroscopy, physical parameters and systematic spectral analysis of doped minerals. Each chapter, written by a well-known specialist, covers classic and new fields of application such as carbonate diagenesis, silicates, brittle deformation in sandstones, gemstone recognition, biomineralization, economic geology or geochronology. Useful to all scientists, graduates and professional engineers throughout the geosciences community.

Photovoltaic and Photoactive Materials

Author : Joseph M. Marshall
Publisher : Springer Science & Business Media
ISBN 13 : 9401006326
Total Pages : 361 pages
Book Rating : 4.4/5 (1 download)

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Book Synopsis Photovoltaic and Photoactive Materials by : Joseph M. Marshall

Download or read book Photovoltaic and Photoactive Materials written by Joseph M. Marshall and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this NATO Advanced Study Institute (ASI) was to present an up-to-date overview of various current areas of interest in the field of photovoltaic and related photoactive materials. This is a wide-ranging subject area, of significant commercial and environmental interest, and involves major contributions from the disciplines of physics, chemistry, materials, electrical and instrumentation engineering, commercial realisation etc. Therefore, we sought to adopt an inter disciplinary approach, bringing together recognised experts in the various fields while retaining a level of treatment accessible to those active in specific individual areas of research and development. The lecture programme commenced with overviews of the present relevance and historical development of the subject area, plus an introduction to various underlying physical principles of importance to the materials and devices to be addressed in later lectures. Building upon this, the ASI then progressed to more detailed aspects of the subject area. We were also fortunately able to obtain a contribution from Thierry Langlois d'Estaintot of the European Commission Directorate, describing present and future EC support for activities in this field. In addition, poster sessions were held throughout the meeting, to allow participants to present and discuss their current activities. These were supported by what proved to be very effective feedback sessions (special thanks to Martin Stutzmann), prior to which groups of participants enthusiastically met (often in the bar) to identify and agree topics of common interest.

ACS Style Guide

Author : Anne M. Coghill
Publisher : American Chemical Society
ISBN 13 : 9780841239494
Total Pages : 0 pages
Book Rating : 4.2/5 (394 download)

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Book Synopsis ACS Style Guide by : Anne M. Coghill

Download or read book ACS Style Guide written by Anne M. Coghill and published by American Chemical Society. This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the time since the second edition of The ACS Style Guide was published, the rapid growth of electronic communication has dramatically changed the scientific, technical, and medical (STM) publication world. This dynamic mode of dissemination is enabling scientists, engineers, and medicalpractitioners all over the world to obtain and transmit information quickly and easily. An essential constant in this changing environment is the requirement that information remain accurate, clear, unambiguous, and ethically sound.This extensive revision of The ACS Style Guide thoroughly examines electronic tools now available to assist STM writers in preparing manuscripts and communicating with publishers. Valuable updates include discussions of markup languages, citation of electronic sources, online submission ofmanuscripts, and preparation of figures, tables, and structures. In keeping current with the changing environment, this edition also contains references to many resources on the internet.With this wealth of new information, The ACS Style Guide's Third Edition continues its long tradition of providing invaluable insight on ethics in scientific communication, the editorial process, copyright, conventions in chemistry, grammar, punctuation, spelling, and writing style for any STMauthor, reviewer, or editor. The Third Edition is the definitive source for all information needed to write, review, submit, and edit scholarly and scientific manuscripts.

Microprobe Techniques in the Earth Sciences

Author : Philip J. Potts
Publisher : Springer Science & Business Media
ISBN 13 : 1461520533
Total Pages : 430 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Microprobe Techniques in the Earth Sciences by : Philip J. Potts

Download or read book Microprobe Techniques in the Earth Sciences written by Philip J. Potts and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: 30% discount for members of The Mineralogical Society of Britain and Ireland This text covers the range of microanalytical techniques available for the analysis of geological samples, principally in research applications. Each chapter is written in a clear, informative style and has a tutorial element, designed to introduce each technique for the beginning and experienced researcher alike.