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Search Publications

NIST Authors in Bold

Displaying 36401 - 36425 of 73697

A compact double-pass acousto-optic modulator system

June 1, 2005
Author(s)
Elizabeth A. Donley, Thomas P. Heavner, F Levi, M O. Tataw, Steven R. Jefferts
A problem that arises when using acousto-optic modulators (AOMs) to scan the laser frequency is the dependence of the beam diffraction angle on the modulation frequency. Alignment problems with AOM-modulated laser beams can be effectively eliminated by

A current-density scale for characterizing nonlinearity in high-Tc superconductors

June 1, 2005
Author(s)
Kenneth Leong, James C. Booth, Susan A. Schima
In this paper, we characterize microwave nonlinearity in a high temperature superconducting (HTS) thin film sample by measurement of a geometry-independent current-density scale j o. This quanity j specifies the strenth of a material-dependent nonlinearity

A Local Oscillator for Chip-Scale Atomic Clocks at NIST

June 1, 2005
Author(s)
Alan Brannon, J Breitbarth, Z Popovic, Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We report the first local oscillator (LO) demonstrating viability in terms of performance, size, and power, for chip scale atomic clocks (CSAC) at the National Institute of Standards and Technology in Boulder, CO. This volgate-controlled oscillator (VCO)

A Web Services Community Model for Services Provisioning

June 1, 2005
Author(s)
Z Luo, J Li, Jia Zhang
The National Software Reference Library (NSRL) of the U.S. National Institute of Standards and Technology (NIST) collects software from various sources and publishes file profiles computed from this software (such as MD5 and SHA-1 hashes) as a Reference

Active Light-Shift Stabilization in Modulated CPT Clocks

June 1, 2005
Author(s)
V Shah, P Schwindt, Vladislav Gerginov, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We demonstrate a simple technique to significantly improve the long-term frequency stability in atomic clocks vased on coherent population trapping (CPT). In this technique an additional servo is used to control the local oscillator power level to ensure

Analysis of the Step-Diagonal Test

June 1, 2005
Author(s)
Johannes A. Soons
The step-diagonal test modifies the diagonal displacement test for machine tool performance evaluation by executing a diagonal as a sequence of single-axis motions. The proposed modification has gained interest because of the claim that the obtained

Analyzing Microstructure by Rietveld Refinement

June 1, 2005
Author(s)
Davor Balzar, N C. Popa
Rietveld refinement has a primary purpose of refining crystal structure. However, this powerful technique is being increasingly used for obtaining microstructural information, such as texture, crystallite size, strain and stress, and crystalline defect

Antenna coupled niobium bolometers for 10 (mu)m radiation detection

June 1, 2005
Author(s)
Robert Hadfield, Aaron J. Miller, Sae Woo Nam, Erich N. Grossman, Robert E. Schwall,
We report on the fabrication and testing of antenna-coupled niobium bolometers for 10-micron wavelength radiation detection. We use 20 nm thick Nb films on oxidized Si substrates. The bolometer design consists of a 1 micron x 1 micron Nb microbridge

Combinatorial and High-Throughput Measurement of the Modulus of Thin Polymer Films

June 1, 2005
Author(s)
Christopher M. Stafford, Shu Guo, Martin Y. Chiang, C Harrison
Considerable attention has been devoted to developing fabrication strategies for constructing combinatorial material libraries as well as tools for characterizing the chemical and physical properties of such libraries. Less attention has been dedicated to

Compressive Prestrain in High-Niobium-Fraction Nb 3 Sn Superconductors

June 1, 2005
Author(s)
John (Jack) W. Ekin, Najib Cheggour, Mike Abrecht, Cameron C. Clickner, Michael Field, Seungok Hong, Jeffrey Parrell, Y. Zhang
Multifilamentary Nb 3Sn superconducting strands fabricated with high niobium fractions have exceptionally high critical-current densities but are sometimes marginally stable during testing. We report a technique for determining the pre-strain in such

Damage to Solid-State Photodiodes by Vacuum Ultraviolet Radiation

June 1, 2005
Author(s)
Uwe Arp, Ping-Shine Shaw, R Gupta, Keith R. Lykke
We report experimental results on the stability of photodiodes obtained at three different wavelengths in the vacuum ultraviolet spectral region. Two of these experiments were based on radiation damage inflicted with excimer lasers at 193 nm and 157 nm and

Development of Multiple Beam Optical Tweezers

June 1, 2005
Author(s)
Dongjin Lee, Thomas W. LeBrun, Arvind Balijepalli, Jason J. Gorman, Cedric V. Gagnon, Daehie Hong, Esther H. Chang
This paper presents the design of a multiple beam optical tweezers instrument used for manipulating micro/nano-sized components. The basic equations used in designing the optical tweezers are derived and the stable and time-sharing multiple beam optical

Development of Traceable Small Force Standards

June 1, 2005
Author(s)
Gordon A. Shaw, Jon R. Pratt
Although instrumented indentation and atomic forcve microscope (AFM) are utilized extensively for the measurement of forces in the piconewton to millinewton regime, accurate calibration of these forces remains an obstacle to quantitative research

Dynamic Factors Contributing to Buckling and Birdnesting During GMAW Wire Feeding

June 1, 2005
Author(s)
Toby Padilla, Timothy P. Quinn, D. R. Munoz, R. A. Rorrer, John R. Berger
This study provides experimental data for determining the factors affecting wire feeding performance. Full-scale experiments show that feeding performance, in terms of wire feed speed and wire feeding force, varies with the material system and with the

Dynamics of Nonlinear and Dispersion Managed Solitons

June 1, 2005
Author(s)
Qudsia Quraishi, Steven T. Cundiff, I Boaz, Mark J. Ablowitz
The relation between the fundamental parameters of energy, temporal duration and dispersion are demonstrated both theoretically and experimentally in a solid-state modelocked laser. An asymptotic theory for the nonlinear and dispersion managed solitons
Displaying 36401 - 36425 of 73697
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