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Displaying 38776 - 38800 of 73697

Pulse Parameter Dependence on Transition Position and Epoch Duration

May 18, 2004
Author(s)
Donald R. Larson, Nicholas Paulter, David I. Bergman
The pulse parameters of amplitudes and transition duration (10% to 90%) are examined as a function of the epoch and position of the transition edge in the epoch. The primary explanations for the observed variations are the pulse aberrations and the finite

'Across-the-Road Photo Traffic Radars: New Calibration Techniques'

May 17, 2004
Author(s)
Claude Weil, Dennis G. Camell, David R. Novotny, Robert T. Johnk
We discuss simulator units for calibrating across-the-road Doppler traffic radar transceivers used in enforcement of highway speed limits. Two units of very similar design were developed, one operating at K-band (24 GHz) and the other at Ka-band (35 GHz)

Precision tests of femtosecond laser optical frequency synthesizers

May 17, 2004
Author(s)
Long-Sheng Ma, Lennart Robertsson, Massimo Zucco, Zhiyi Bi, Robert Windeler, A Bartels, G Wilpers, Christopher W. Oates, Leo W. Hollberg, Scott Diddams
We compare the accuracy of femtosecond laser optical frequency synthesizers that employ microstructured fibers with those that directly generate a broadband output. No limitation of either system is found at fractional frequency levels of 1x10 -18.

A phase locked, fiber laser-based frequency comb: limit on optical linewidth

May 16, 2004
Author(s)
Brian Washburn, Scott Diddams, Nathan R. Newbury, Jeffrey W. Nicholson, M. Yan, C. G. Jorgensen
A phase-locked fiber laser-based supercontinuum source is presented. The linewidth of a single line of the IR frequency comb produced by fiber laser-based supercontinuum source is less than or equal to}6 kHz.

Absolute frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

May 16, 2004
Author(s)
Kristan L. Corwin, I Thomann, Tasshi Dennis, R W. Fox, William C. Swann, E. A. Curtis, C. W. Oates, G Wilpers, A Bartels, Sarah L. Gilbert, Leo W. Hollberg, Scott Diddams, Nathan R. Newbury, Jeffrey W. Nicholson, M. Yan
A Cr:forsterite laser-based frequency comb is stabilized simultaneously to two NIST frequency references. Methane lines from 1315 nm - 1330 nm are measured with ±2.3 MHz uncertainty. The pressure shifts are also evaluated.

Cavity ring-down spectroscopy of semiconductor quantum dots

May 16, 2004
Author(s)
Joseph J. Berry, Todd E. Harvey, Richard Mirin, A Marian, Jun Ye
We employ cavity ringdown to perform absorption experiments of InGaAs/GaAs QDs. Integrating an AlAs/GaAs DBR incorporating InGaAs QD?s into a Fabry-Perot cavity, we demonstrate this approach and its potentials for sensitive measurements on semiconductor

Photoluminescence from an Nd3+ doped AlGaAs semiconductor structure

May 16, 2004
Author(s)
Kirk Ullmann, Mark Su, Kevin L. Silverman, Joseph J. Berry, Todd E. Harvey, Richard Mirin
We report room temperature photoluminescence from a Nd3+ doped AlGaAs semiconductor. Oxidation of the AlGaAs greatly improves the luminescence efficiency of the Nd3+ ions.

Temperature-dependent, single quantum dot single photon statistics

May 16, 2004
Author(s)
Richard P. Mirin
We describe temperature-dependent photon antibunching measurements from single InGaAs/GaAs quantum dots. The second order intensity correlation demonstrates single emitter emission up to 120 K and nonclassical light emission to 135 K.

Establishing Benchmarks for the First Industrial Fluids Simulation Challenge

May 15, 2004
Author(s)
Daniel G. Friend, David Frurip, Joe W. Magee, J Olson
In order to judge the entries in the First Fluid Properties Simulation Challenge [1], a benchmarking committee was established, comprised of the authors of this paper. The mandate of the committee was to determine best values for the physical property

NIST SP430, Household Weights and Measures

May 15, 2004
Author(s)
Kenneth S. Butcher
The purpose of this publication is to present, in a convenient form, the weights and measures tables most useful for household purposes, together with associated weights and measures information of general household interests. It also provides basic metric

Observation of Reduced Three-Body Recombination in a Fermionized 1D Bose Gas

May 14, 2004
Author(s)
B L. Tolra, K M. O'Hara, J H. Huckans, William D. Phillips, S L. Rolston, James V. Porto
We investigate correlation properties of a one-dimensional interacting Bose gas by loading a mangnetically trapped 87Rb Bose-Einstein condensate into a deep two-dimensional optical lattice. We measure the three-body recombination rate for both the BEC in

Display Metrology Concerns in International Standards

May 12, 2004
Author(s)
Paul A. Boynton
The display metrologist often assumes that all one needs is a calibrated, well characterized instrument to obtain accurate assessment of display quality. However, measurement procedures can be ambiguous, complicated, and not robust, introducing errors to
Displaying 38776 - 38800 of 73697
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