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Investigation of strain birefringence and wavefront distortion in 001 plates of KD sub 2 PO sub 4
When 001 plates of KD{sub 2}PO{sub 4} (KD*P) are used in Pockels cells, strain induced refractive index variations result in beam depolarization and transmitted wavefront distortion. The depolarization is determined by the induced birefringence while the wavefront distortion is controlled by the average index shift. Here we show that the birefringence is determined by the shear stress in the xy-plane of the crystal while the average index shift depends only on the normal stresses. Furthermore, for depolarization losses of 0.1 to 1.0% and wavefront distortion of 0.1 to 1.0{lambda}, the critical range of stress is 10{sup 5} to 10{sup 6} Pa. We also present measured depolarization loss and wavefront distortion profiles for 5, 16 and 27cm, 95% deuterated, KD*P crystals. Using the analysis described above we show that the maximum internal stresses in the crystals are within the critical range, but that the area averaged stresses are substantially lower. We find that crystals from different locations along the length of a boule have similar strain birefringence and wavefront distortion profiles indicating that the growth conditions which generate the internal strain persist throughout much of the growth history of the boule. Finally, we discuss potential sources of strain in KD*P. 8 …
Date:
August 26, 1991
Creator:
De Yoreo, J. J. & Woods, B. W.
Object Type:
Article
System:
The UNT Digital Library
Interferometric measurements of multilayer and double shell inertial fusion targets
Optical interference microscopy plays an important role in the measurement of targets for inertial confinement fusion experiments. We describe how these techniques are applied to the measurement of thickness and refractive index of multilayer films on both flat substrates and microsphere targets. We also discuss procedures for manipulating and examining microsphere targets to measure defects and wall thickness variations anywhere on the target. Finally, we describe the use of optical interferometry to measure the individual components and final assembled structure of double-shell targets. The accuracy of these measurements is from 0.03 to 0.5 ..mu..m, depending on the specific application.
Date:
August 26, 1980
Creator:
Weinstein, B.W.; Weir, J.T. & Willenborg, D.L.
Object Type:
Article
System:
The UNT Digital Library
Use of molecular beams to support microspheres during plasma coating
Spherical laser fusion targets can be levitated on beams of Ar or other gas atoms. This is an especially useful and reliable technique for supporting microspheres during plasma coating or plasma etching. The reliability of this technique is principally the result of two things: the success of a special centering device which provides a lateral, stabilizing force on the levitated microspheres; and a gas handling system which is capable of controlling levitation gas flow in the microtorr liter/sec range. We have determined that the operational regime of this device is that of Knudsen's flow. This knowledge of the flow characteristics has been important in developing this device.
Date:
August 26, 1980
Creator:
Crane, J. K.; Smith, R. D.; Johnson, W. L.; Letts, S. A.; Korbel, G. R. & Krenick, R. M.
Object Type:
Article
System:
The UNT Digital Library
Silver recovery system data
In August of 1990 the Savannah River Site Photography Group began testing on a different type of silver recovery system. This paper describes the baseline study and the different phases of installation and testing of the system.
Date:
August 26, 1991
Creator:
Boulineau, B.
Object Type:
Report
System:
The UNT Digital Library
High-velocity impact tests involving thin spherical shells of tantalum and 304 stainless steel
This experimental program generated data to improve computer-code modeling of impact phenomena. The improved computation technique will be used to design a fissile-material container able to withstand a 335 m/s impact. The program involved flyer-plate-impact tests using thin shells of annealed 304 stainless steel and annealed tantalum at impact velocities of 28 to 180 m/s. No active instrumentation was used in this study; instead, all data were derived from measurements of test specimens. Pre- and post-test measurement of interior and exterior dot patterns etched on the shells provided surface-strain information. Radiographs of the deformed shells provided shell-contour data that we plotted vs impact velocity. Curves were fit to these data. We found that normalized crush height varies almost linearly with impact velocity for both materials, that normalized radius of contact varies directly with impact velocity for both materials but appears independent of shell thickness for tantalum, and that normalized interior-fold radius varies inversely with impact velocity and directly with shell thickness for stainless steel, but no clear relationship appears for tantalum.
Date:
August 26, 1977
Creator:
Steffan, K. L.
Object Type:
Report
System:
The UNT Digital Library
The application of the ADSP-21020 40-bit floating point DSP microprocessor in a digital Doppler radar
A continuous wave doppler radar system has been designed which is portable, easily deployable and can be remotely controlled. The system is immune to ground clutter and is used for wind speed detection and direction determination. Nearly real time digital signal processing is performed by an Analog Devices ADSP-21020, a 40-bit floating point Digital Signal Processing (DSP) microprocessor. This paper provides an overview of the design of the system including the radio frequency (RF) to digital interface. The various DSP detection algorithms are discussed and compared to system performance and sensitivity. Finally, DSP performance is compared to the performance of an earlier system using Analog Device's ADSP-2100. 6 refs.
Date:
August 26, 1991
Creator:
Robinson, S. H. & Morrison, R. E.
Object Type:
Article
System:
The UNT Digital Library
SEC Climate Change Disclosure Guidance: An Overview and Congressional Concerns
This report briefly describes the Guidance; provides opposing views on the Guidance, including past congressional legislation; summarizes a study on potential corporate costs and benefits of implementing the Guidance; and examines the impact of the Guidance from the perspectives of investors, corporations, and finance professionals.
Date:
August 26, 2013
Creator:
Shorter, Gary
Object Type:
Report
System:
The UNT Digital Library
Executive Correspondence – Letter dtd 08/25/2005 to Commissioner Coyle from George Tobin
Executive Correspondence – Letter dtd 08/25/2005 to Commissioner Coyle from George Tobin attaching an error message from the BRAC website stating he was unable to load his comments.
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Executive Correspondence – Letter dtd 08/25/2005 to Chairman Principi from George Voinovich
Executive Correspondence – Letter dtd 08/25/2005 to Chairman Principi from George Voinovich thanking the BRAC Commission for keeping DFAS Cleveland open
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence – Letter dtd 08/25/2005 to Chairman Principi from James Hickey
Coalition Correspondence – Letter dtd 08/25/2005 to Chairman Principi from James Hickey regarding the disposition of equipment at the Lone Star Army Ammunition Plant in Texarkana, TX
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Executive Correspondence – Letter to Chairman Principi from Denny Rehberg
Executive Correspondence – Letter to Chairman Principi from Denny Rehberg encouraging the BRAC Commission to maintain the 120th Fighter Wing in Great Falls, MT
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence – Letter to all Commissioners from Michael Holt
Community Correspondence – Letter to all Commissioners from Michael Holt suggesting that the commission should keep track of workforce loses both military and civilian
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter from Dr. Michael D. Lagios Regarding Armed Forces Institute of Pathology
Community Correspondence - Letter from Dr. Michael D. Lagios Regarding Armed Forces Institute of Pathology and many reasons why closing AFIP will have many adverse effects on support of medical education and research
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter from William Jennings Regarding Multi-dimensional aspect of the Threat Posed to America
Community Correspondence - Letter from William Jennings Regarding Multi-dimensional aspect of the Threat Posed to America
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter from Bill Chancellor Regarding US Army Aviation Technical Test Center
Community Correspondence - Letter from Bill Chancellor Regarding the recommendation to move US Army Aviation Technical Test Center from Fort Rucker to Redstone Arsenal
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter from Ivan - Overall Recommendations
Community Correspondence - Letter from concerned citizen Ivan - Overall Recommendations
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter Constance E. Degustis Regarding New London Sub Base
Community Correspondence - Letter Constance E. Degustis Regarding New London Sub Base in support of keeping the installation open
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence - Letters from Individuals Regarding the Defense Office of Hearings and Appeals
Coalition Correspondence - Letter from David I. West of Hall & West, P.S. Regarding Defense Office of Hearings and Appeals and David P. Price of McCormack and Associates - opposition to move DOHA to Ft Meade MD
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence - Letter from Senior Director of Ledyard Senior Center Margaret Lathrop
Coalition Correspondence - Letter from Senior Director of Ledyard Senior Center Margaret Lathrop regarding Groton Sub Base
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Community Correspondence - Letter from Beryl R. Johnson in support of Closing the Kelly Support Center In Oakdale PA
Community Correspondence - Letter from Beryl R. Johnson in support of Closing the Kelly Support Center In Oakdale PA and Pittsburg International Airport
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence - Letters from Doctors of the Affiliated Pathologists, P.A.
Coalition Correspondence - Letters from Doctors of the Affiliated Pathologists, P.A.
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence - Letter from the CRISP GROUP Concerned Responsible Individuals to Support Picatinny NJ
Coalition Correspondence - Letter from the CRISP GROUP Concerned Responsible Individuals to Support Picatinny NJ
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Coalition Correspondence - Letter from The Forest Glen Commonwealth Inc
Coalition Correspondence - Letter from the Forest Glen Commonwealth Inc - copy of a letter to Director Patrick O'Brien of the office of Economic Advantage to preserve all or parts of the real property included in current or incomplete BRAC closures
Date:
August 26, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Letter from an individual regarding Portsmouth Naval Shipyard and BRAC Regional Hearing in Boston
Community Correspondence - Letter from an individual regarding Portsmouth Naval Shipyard and BRAC Regional Hearing in Boston
Date:
August 26, 2005
Creator:
unknown
Object Type:
Legal Document
System:
The UNT Digital Library