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Topic Area: Physics

Displaying records 501 to 510 of 763 records.
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501. High Contrast Coherent Population Trapping Resonances Using Four Wave Mixing in 87Rb.
Topic: Physics
Published: 5/15/2007
Authors: V Shah, Svenja A Knappe, Leo W. Hollberg, John E Kitching
Abstract: We demonstrate a simple technique to generate coherent population trapping (CPT) resonances with very high contrast using four wave mixing in 87Rb atoms. In the experiment, we take advantage of the spectral overlap between F=2 -> F'=2 and F=3 -> F'=2 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50461

502. Characterization of an Optical Time Domain Reflectometer Calibrator
Topic: Physics
Published: 3/1/2007
Authors: Donald R Larson, Nicholas G Paulter Jr, Kenneth C Blaney
Abstract: We report the results of an investigation into the signal characteristics and behavior of an instrument used to calibrate Optical Time Domain Reflectometers. This instrument implements the Telecommunications Industry Association standard TIA/EIA-455- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32449

503. High Accuracy Verification of a Correlated-Photon-Based Method for Determining Photon-Counting Detection Efficiency
Topic: Physics
Published: 2/19/2007
Authors: Sergey V Polyakov, Alan L Migdall
Abstract: We have implemented and characterized an independent primary standard method for the calibration of detection efficiency of photon counting detectors. The method is based on a light source producing correlated photon pairs. We have determined, and mo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841045

504. Testing local position invariance with four Cesium fountain primary frequency standards and four NIST Hydrogen masers
Topic: Physics
Published: 2/16/2007
Authors: Neil Ashby, Thomas Patrick Heavner, Steven R Jefferts, Thomas Edward Parker, A Radnaev, Y Dudin
Abstract: Local Position Invariance (LPI), together with Local Lorentz Invariance (LLI) and the Weak Equivalence Principle (WEP) form the foundation of the General Theory of Relativity. LPI implies that if atomic clocks of different structures are placed toget ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50482

505. Solvation Structure of Ions in Water
Topic: Physics
Published: 2/14/2007
Author: Raymond Dale Mountain
Abstract: Molecular dynamics simulations of ions in water are reported for solutionsof varying solute concentration at ambient conditions for6 cations and 4 anions in 10 solutes. The solutes were selected to show trends inproperties as the size and charge dens ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831983

506. Quantum Computing with Very Noisy Devices
Topic: Physics
Published: 2/13/2007
Author: Emanuel H Knill
Abstract: This lecture was presented at the Workshop on Trapped Ion Quantum Computing hosted by NIST, February 21 - 24, 2006. It discussed the basic principles of fault-tolerant architectures for quantum computing, why we should be concerned with the resources ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150306

507. Frequency Uncertainty for Optically Referenced Femotsecond Laser Frequency Combs
Topic: Physics
Published: 2/1/2007
Authors: L Ma, Zhiyi Bi, A Bartels, Kyoungsik Kim, Lennart Robertsson, Massimo Zucco, R Windeler, G Wilpers, Christopher W Oates, Leo W. Hollberg, Scott A Diddams
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=105009

508. Frequency Uncertainty for Optically Referenced Femtosecond Laser Frequency Combs
Topic: Physics
Published: 2/1/2007
Authors: Long-Sheng Ma, Zhiyi Bi, A Bartels, Kyoungsik Kim, Lennart Robertsson, Massimo Zucco, Robert Windeler, G Wilpers, Christopher W Oates, Leo W. Hollberg, Scott A Diddams
Abstract: We present measurements and analysis of the currently known residual frequency uncertainty of femtosecond laser frequency combs (FLFCs) based on Kerr-lens mode-locked Ti:sapphire lasers. Broadband frequency combs generated directly from the laser os ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50303

509. Molecular Dynamics Calculations of the Viscosity of Xenon Gas
Topic: Physics
Published: 2/1/2007
Author: Raymond Dale Mountain
Abstract: The density variation of the viscosity of xenon gas is determined using molecular dynamics simulation with a semi-empirical pair potential fit to low density gas properties. The gas states ranged in density from 48.4 kg m-3 to 999 kg m-3 and varied ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831757

510. Introduction to Journal of Modern Optics Special Issue on Single Photon: Sources, Detectors, Applications and Measurement Methods
Topic: Physics
Published: 1/20/2007
Authors: J Cheung, Alan L Migdall, Stefania Castelletto
Abstract: In October 2005, a 2-day follow up workshop, Single photon: sources, detectors, applications and measurement methods, was held at the NPL (National Physical Laboratory, UK). The focus for this workshop was to report on the key developments since the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841035



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