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Time Resolved Imaging Of Material Response Following Laser Induced Breakdown In The Bulk And Surface Of Fused Silica
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Book Synopsis Time-Resolved Imaging of Material Response Following Laser-Induced Breakdown in the Bulk and Surface of Fused Silica by :
Download or read book Time-Resolved Imaging of Material Response Following Laser-Induced Breakdown in the Bulk and Surface of Fused Silica written by and published by . This book was released on 2010 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical components within high energy laser systems are susceptible to laser-induced material modification when the breakdown threshold is exceeded or damage is initiated by pre-existing impurities or defects. These modifications are the result of exposure to extreme conditions involving the generation of high temperatures and pressures and occur on a volumetric scale of the order of a few cubic microns. The response of the material following localized energy deposition, including the timeline of events and the individual processes involved during this timeline, is still largely unknown. In this work, we investigate the events taking place during the entire timeline in both bulk and surface damage in fused silica using a set of time-resolved microscopy systems. These microscope systems offer up to 1 micron spatial resolution when imaging static or dynamic effects, allowing for imaging of the entire process with adequate temporal and spatial resolution. These systems incorporate various pump-probe geometries designed to optimize the sensitivity for detecting individual aspects of the process such as the propagation of shock waves, near-surface material motion, the speed of ejecta, and material transformations. The experimental results indicate that the material response can be separated into distinct phases, some terminating within a few tens of nanoseconds but some extending up to about 100 microseconds. Overall the results demonstrate that the final characteristics of the modified region depend on the material response to the energy deposition and not on the laser parameters.
Book Synopsis Time-resolved Imaging of Material Response During Laser-induced Bulk Damage in SiO2 by :
Download or read book Time-resolved Imaging of Material Response During Laser-induced Bulk Damage in SiO2 written by and published by . This book was released on 2008 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on time resolved imaging of the dynamic events taking place during laser-induced damage in the bulk of fused silica samples with nanosecond temporal resolution and one micron spatial resolution. These events include: shock/pressure wave formation and propagation, transient absorption, crack propagation and formation of residual stress fields. The work has been performed using a time-resolved microscope system that utilizes a probe pulse to acquire images at delay times covering the entire timeline of a damage event. Image information is enhanced using polarized illumination and simultaneously recording the two orthogonal polarization image components. For the case of fused silica, an electronic excitation is first observed accompanied by the onset of a pressure wave generation and propagation. Cracks are seen to form early in the process and reach their final size at about 25 ns into the damage event. In addition, changes that in part are attributed to transient absorption in the modified material are observed for delays up to about 200 microseconds.
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 Imaging System to Measure Kinetics of Material Cluster Ejection During Exit-Surface Damage Initiation and Growth in Fused Silica by :
Download or read book Imaging System to Measure Kinetics of Material Cluster Ejection During Exit-Surface Damage Initiation and Growth in Fused Silica written by and published by . This book was released on 2009 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced damage on the surface of optical components typically is manifested by the formation of microscopic craters that can ultimately degrade the optics performance characteristics. It is believed that the damage process is the result of the material exposure to high temperatures and pressures within a volume on the order of several cubic microns located just below the surface. The response of the material following initial localized energy deposition by the laser pulse, including the timeline of events and the individual processes involved during this timeline, is still largely unknown. In this work we introduce a time-resolved microscope system designed to enable a detailed investigation of the sequence of dynamic events involved during surface damage. To best capture individual aspects of the damage timeline, this system is employed in multiple imaging configurations (such as multi-view image acquisition at a single time point and multi-image acquisition at different time points of the same event) and offers sensitivity to phenomena at very early delay times. The capabilities of this system are demonstrated with preliminary results from the study of exit-surface damage in fused silica. The time-resolved images provide information on the material response immediately following laser energy deposition, the processes later involved during crater formation or growth, the material ejecta kinetics, and overall material motion and transformation. Such results offer insight into the mechanisms governing damage initiation and growth in the optical components of ICF class laser systems.
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 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 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 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 1987 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1983 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigate Laser Induced Damage in Optical Coatings Using Time Resolved Raman Spectroscopy by : G. J. Exarhos
Download or read book Investigate Laser Induced Damage in Optical Coatings Using Time Resolved Raman Spectroscopy written by G. J. Exarhos and published by . This book was released on 1985 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raman spectroscopy is shown to be a viable and rapid technique for characterization of laser induced damage in thin dielectric coatings of fused silica substrates. Unequivocal identification of crystalline and amorphous phases can be discerned from measured vibrational spectra. A two laser (damage-probe) technique has been developed for in situ analysis of laser coatings. Raman measurements made at long times following pulsed laser damage serve to characterize the equilibrium damage state and can be used to spatially profile the damage zone. Time resolved measurements acquired within nanoseconds following laser induced damage to optical coatings are studied by these and related Raman experiments from which mechanistic information can also be inferred. The primary mechanism of failure in titanium dioxide (TiO2) coatings results from crystalline phase changes induced thermally or by multiphoton excitation processes. A similiar failure mode is predicted for other oxidic coatings such as zirconium dioxide (ZrO2) which can exist in different room temperature stable phases. Keywords: Laser Damage Mechanisms; Time Resolved Raman Spectroscopy; Molecular Vibrational Studies; Laser Heating; Phase Transformations; Titanium Dioxide Optical Coatings.
Book Synopsis Pump and Probe Damage Testing for Investigation of Transient Material Modifications Associated with Laser Damage in Optical Materials by :
Download or read book Pump and Probe Damage Testing for Investigation of Transient Material Modifications Associated with Laser Damage in Optical Materials written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced breakdown in the bulk of transparent dielectric materials is associated with the generation of extreme localized conditions of temperatures and pressures. In this work, we perform pump and probe damage testing experiments to investigate the evolution of transient absorption by the host material arising from modifications following confined laser energy deposition in fused silica and DKDP materials. Specifically, we measure the size of the damage sites observed in the region of spatial overlap between the pump and probe pulses versus probe time delay and energy. Results of this proof-of-principle experimental work confirm that material modifications under extreme conditions created during a damage event include transient optical absorption. In addition, we found that the relaxation times of the induced absorption are very distinct for DKDP and SiO2 even under identical excitation conditions, on the order of 100 ns and 100 [mu]s, respectively.
Book Synopsis Morphology of Ejected Debris from Laser Super-heated Fused Silica Following Exit Surface Laser-induced Damage by :
Download or read book Morphology of Ejected Debris from Laser Super-heated Fused Silica Following Exit Surface Laser-induced Damage written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Correlation of Laser-Induced Damage to Phase Objects in Bulk Fused Silica by : M. A. Johnson
Download or read book Correlation of Laser-Induced Damage to Phase Objects in Bulk Fused Silica written by M. A. Johnson and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Optical Sciences Laser (OSL) Upgrade facility, described in last year's proceedings, is a kJ-class, large aperture (100cm{sup 2}) laser system that can accommodate prototype optical components for large-scale inertial confinement fusion lasers. High-energy operation of such lasers is often limited by damage to the optical components. Recent experiments on the OSL Upgrade facility using fused silica components at 4 J/cm{sup 2} (351-nm, 3-ns) have created output surface and bulk damage sites that have been correlated to phase objects in the bulk of the material. Optical Path Difference (OPD) measurements of the phase defects indicate the probability of laser-induced damage is strongly dependent on OPD.
Book Synopsis Laser Induced Damage in Optical Materials: by : Arthur H. Guenther
Download or read book Laser Induced Damage in Optical Materials: written by Arthur H. Guenther and published by ASTM International. This book was released on 1977 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-induced Damage Initiated on the Surface of Particle Contaminated Fused Silica Optics at 1064nm by : Kenneth Jerome Francis Michlitsch
Download or read book Laser-induced Damage Initiated on the Surface of Particle Contaminated Fused Silica Optics at 1064nm written by Kenneth Jerome Francis Michlitsch and published by . This book was released on 1997 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Damage in Optical Materials: 1984 by : U.S Department fo Commerce
Download or read book Laser Induced Damage in Optical Materials: 1984 written by U.S Department fo Commerce and published by ASTM International. This book was released on 1986 with total page 447 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:
