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Optical coatings for laser fusion applications

Description: Lasers for fusion experiments use thin-film dielectric coatings for reflecting, antireflecting and polarizing surface elements. Coatings are most important to the Nd:glass laser application. The most important requirements of these coatings are accuracy of the average value of reflectance and transmission, uniformity of amplitude and phase front of the reflected or transmitted light, and laser damage threshold. Damage resistance strongly affects the laser's design and performance. The success o… more
Date: April 24, 1980
Creator: Lowdermilk, W.H.; Milam, D. & Rainer, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Progress on Low-Cost, High-Quality, High-Temperature Superconducting Tapes Deposited by the Combustion Chemical Vapor Deposition Process

Description: The innovative Combustion Chemical Vapor Deposition (CCVD) process is a non-vacuum technique that is being investigated to enable next generation products in several application areas including high-temperature superconductors (HTS). In combination with the Rolling Assisted Biaxially Textured Substrate (RABiTS) technology, the CCVD process has significant promise to provide low-cost, high-quality lengths of YBCO coated conductor. Over 100 meter lengths of both Ni and Ni-W (3 at. Wt.%) substrate… more
Date: June 24, 2008
Creator: Shoup, S. S.; White, M. K.; Krebs, S. L.; Darnell, N.; King, A. C.; Mattox, D. S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Wavelength dependence and efficiency of laser heating of DT-filled polymer-coated glass microspheres at cryogenic temperatures

Description: We have determined experimentally the fraction of laser light incident on DT filled cryogenic polymer coated and bare glass microsphere targets that is absorbed to produce target heating. Data have been obtained for bare glass and CH and CF polymer coated microspheres at 488 nm and 632 nm laser wavelengths. The measurement technique used and experimental results obtained are presented.
Date: September 24, 1981
Creator: Darling, D.H.; Bernat, T.P. & Ives, B.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical and environmentally protective coatings for potassium dihydrogen phosphate (KDP) harmonic converter crystals

Description: Potassium dihydrogen phosphate (KDP) crystals have been used as harmonic converters on the Nova laser at LLNL for over six years. All crystals were coated with a single layer, quarterwave AR coating of porous silica with a refractive index of 1.22. This was prepared by a sol-gel process and was applied from a colloidal suspension by spin coating at room temperature. A few crystals were also coated with a methyl silicone coating prior to the application of the AR coating for environmental protec… more
Date: June 24, 1991
Creator: Thomas, I. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Conveyorized Photoresist Stripping Replacement for Flex Circuit Fabrication

Description: A replacement conveyorized photoresist stripping system was characterized to replace the ASI photoresist stripping system. This system uses the qualified ADF-25c chemistry for the fabrication of flex circuits, while the ASI uses the qualified potassium hydroxide chemistry. The stripping process removes photoresist, which is used to protect the copper traces being formed during the etch process.
Date: February 24, 2009
Creator: Donahue, Megan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Composit, Nanoparticle-Based Anode material for Li-ion Batteries Applied in Hybrid Electric (HEV's)

Description: Lithium-ion batteries are promising energy storage devices in hybrid and electric vehicles with high specific energy values ({approx}150 Wh/kg), energy density ({approx}400 Wh/L), and long cycle life (>15 years). However, applications in hybrid and electric vehicles require increased energy density and improved low-temperature (<-10 C) performance. Silicon-based anodes are inexpensive, environmentally benign, and offer excellent theoretical capacity values ({approx}4000 mAh/g), leading to… more
Date: August 24, 2009
Creator: Gulbinska, Dr. Malgorzata
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Observation of Magnetic Resonances in Electron Clouds in a Positron Storage Ring

Description: The first experimental observation of magnetic resonances in electron clouds is reported. The resonance was observed as a modulation in cloud intensity for uncoated as well as TiN-coated aluminum surfaces in the positron storage ring of the PEP-II collider at SLAC. Electron clouds frequently arise in accelerators of positively charged particles, and severely impact the machines performance. The TiN coating was found to be an effective remedy, reducing the cloud intensity by three orders of magn… more
Date: August 24, 2011
Creator: Pivi, M. T. F.; Ng, J. S. T.; Cooper, F.; Kharakh, D.; King, F.; Kirby, R. E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

XRD Technique: A way to disseminate structural changes in iron-based amorphous materials

Description: Prevention of corrosion is a vital goal for the Department of Defense when billions of dollars are spent every year. Corrosion resistant materials have applications in all sort of military vehicles, and more importantly in naval vessels and submarines which come in contact with the seawater. It is known that corrosion resistance property can be improved by the used of structurally designed materials in the amorphous state where the atoms are arranged in a non-periodic fashion and specific atoms… more
Date: May 24, 2007
Creator: Saw, C. K.; Lian, T.; Day, D. & Farmer, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ALD Functionalized Nanoporous Gold: Thermal Stability, Mechanical Properties, and Catalytic Activity

Description: Nanoporous metals have many technologically promising applications but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied the effect of nanometer-thick alumina and titania ALD films on thermal stability, mechanical properties, and catalytic activity of nanoporous gold (np-Au). Our results demonstrate th… more
Date: March 24, 2011
Creator: Biener, M M; Biener, J; Wichmann, A; Wittstock, A; Baumann, T F; Baeumer, M et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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DOE Geothermal Program Review - Critique on Production

Description: I think it is wonderful that our Country can support research projects. Innovations and the development of cost-effective technology is a strategic issue for our industry. We all know that this is important--in fact, required to keep the industry healthy. The objective must be to continuously develop technology which will do things better for less money. This is the ultimate goal of research. I've been asked to comment on production research issues. And so, I will limit my discussion to just th… more
Date: March 24, 1992
Creator: Jung, Douglas B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Concepts for Smart Protective High-Temperature Coatings

Description: The need for environmental resistance is a critical material barrier to the operation of fossil systems with the improved energy efficiencies and emissions performance described by the goals of the Vision 21 concept of the U.S. Department of Energy's Office of Fossil Energy. All fossil fuel-derived processes contain reactive species and high-temperature degradation arising from reactions of solids with gases and condensible products often limits performance or materials lifetimes such that effi… more
Date: April 24, 2003
Creator: Tortorelli, P. F.; Brady, M. P. & Wright, I. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Understanding Particle Defect Transport in an Ultra-Clean Sputter Coating Process

Description: Low-defect mask blanks remain a key technical challenge to Extreme Ultraviolet Lithography (EUVL). The mask blank is ion-beam sputter-coated with an 81-layer Mo/Si multilayer stack for high reflectance at {lambda} = 13.4nm. The current mask coating process can achieve a median added defect level of 0.05 defects/cm{sup 2} (12 added defects 90nm or larger on a 200mm Si-wafer test substrate), but this must be reduced by about a factor of 10 to meet mask cost requirements for EUVL. To further reduc… more
Date: March 24, 2003
Creator: Walton, C.; Kearney, P.; Folta, J.; Sweeney, D. & Mirkarimi, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Review of cathodic arc deposition technology at the start of the new millennium

Description: The vacuum cathodic arc has been known to provide a means of producing coatings since the second half of the 19th century. This makes it one of the oldest known means for making coatings in a vacuum. In the last century it has been recognized that the copious quantities of ions produced by the process offers certain advantages in terms of coating properties. Specifically, ions can be steered and/or accelerated toward the parts to be coated. This, in turn, can provide enhanced adhesion, film den… more
Date: February 24, 2000
Creator: Sanders, D. M. & Anders, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ENHANCED SAFEGUARDS: THE ROLE OF SMART FUNCTIONAL COATINGS FOR TAMPER INDICATION

Description: This work investigates the synthesis of smart functional coatings (SFC) using chemical solution deposition methods. Chemical solution deposition methods have recently received attention in the materials research community due to several unique advantages that include low temperature processing, high homogeneity of final products, the ability to fabricate materials with controlled surface properties and pore structures, and the ease of dopant incorporation in controlled concentrations. The optic… more
Date: February 24, 2012
Creator: Mendez-Torres, A.; Martinez-Rodriguez, M.; Brinkman, K. & Krementz, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Energy Reductions Using Next-Generation Remanufacturing Techniques

Description: The goal of this project was to develop a radically new surface coating approach that greatly enhances the performance of thermal spray coatings. Rather than relying on a roughened grit blasted substrate surface for developing a mechanical bond between the coating and substrate, which is the normal practice with conventional thermal spraying, a hybrid approach of combining a focused laser beam to thermally treat the substrate surface in the vicinity of the rapidly approaching thermally-sprayed … more
Date: February 24, 2012
Creator: Sordelet, Daniel & Racek, Ondrej
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Plasma-Material Interface Development for Future Spherical Tokamak-based Devices in NSTX.

Description: The divertor plasma-material interface (PMI) must be able to withstand steady-state heat fluxes up to 10 MW/m{sup 2} (a limit imposed by the present day divertor material and engineering constraints) with minimal material erosion, as well as to provide impurity control and ion density pumping capabilities. In spherical tokamaks (STs), the compact divertor geometry and the requirement of low core electron collisionality n*{sub e} at n{sub e} < 0.5-0.7 n{sub G} (where n{sub G} is the Greenwald… more
Date: September 24, 2011
Creator: Soukhanovskii, V. A.; Battaglia, D.; Bell, M G.; Bell, R. E.; Diallo, A.; Gerhardt, S. et al.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
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1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors

Description: Using a well characterized 1.06 μm 150 ps glass laser pulse the damage characteristics for diamond turned, diamond turned/ polished, and polished copper and silver mirrors less than 5 cm diameter were studied. Although most samples were tested with a normal angle of incidence, some were tested at 45$sup 0$ with different linear polarization showing an increase in damage threshold for S polarization. Different damage mechanisms observed will be discussed. Laser damage is related to residual surf… more
Date: July 24, 1975
Creator: Saito, T. T.; Milam, D.; Baker, P. & Murphy, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fluorescence Rise Time Measurements for High Temperature Fluorescence-Based Thermometry

Description: Certain ceramic-like phosphor materials exhibit bright fluorescence with a pronounced temperature dependence over a range which spans the cryogenic to 1700 C, depending on the specific phosphor. To measure temperature, a surface, for instance a turbine blade, is coated with the material. An optical system, sometimes including optical fibers, conveys stimulating light and collects the emission for analysis. Either emission intensity or decay time may indicate temperature. Previously fielded test… more
Date: March 24, 2005
Creator: Allison, S.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fiber-Optic Sensing Technology

Description: This article offers a basic review of fiber-optic sensing technology, or more specifically, fiber-optic sensing technology as applied to the qualitative or quantitative identification of a chemical sample, and how it works,
Date: October 24, 1996
Creator: Milnes, M.; Baylor, L.C. & Bave, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reticle blanks for extreme ultraviolet lithography: Ion beam sputter deposition of low defect density Mo/Si multilayers

Description: We report on growth of low defect density Mo/Si multilayer (ML) coatings. The coatings were grown in a deposition system designed for EUVL reticle blank fabrication. Complete, 81 layer, high reflectance Mo/Si ML coatings were deposited on 150 mm dia (100) oriented Si wafer substrates using ion beam sputter deposition. Added defects, measured by optical scattering, correspond to defect densities of 2x10{sup -2}/cm{sup 2}. This represents a reduction in defect density of Mo/Si ML coatings by a fa… more
Date: June 24, 1996
Creator: Vernon, S.P.; Kania, D.R.; Kearney, P.A.; Levesque, R.A.; Hayes, A.V.; Druz, B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low level absorptance measurements and scans of high performance optical coatings for atomic vapor laser isotope separation applications

Description: A surface thermal lensing and a radiometric technique was used to characterize the absorptance dependence on time, power, site, and technique of low absorptance optical multilayered coatings.
Date: January 24, 1998
Creator: Chow, R.; Taylor, J. R.; Wu, Z. L.; Krupka, R. & Yang, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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