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Displaying records 671 to 680 of 705 records.
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671. Ultra-cold mechanical resonators coupled to atoms in an optical lattice
Topic: Physics
Published: 9/17/2009
Authors: Andrew Geraci, John E Kitching
Abstract: We propose an experiment utilizing an array of cooled micro-cantilevers coupled to a sample of ultra-cold atoms trapped near a micro-fabricated surface. The cantilevers allow individual lattice site addressing for atomic state control and readout, an ...

672. Ultra-low noise regenerative frequency divider
Topic: Physics
Published: 11/11/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason A. (Jason) DeSalvo, David Allan Howe
Abstract: We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these f ...

673. Ultra-low-noise Regenerative Frequency Divider for High Spectral Purity RF Signal Generation
Topic: Physics
Published: 5/24/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason A. (Jason) DeSalvo, Tara Michele Fortier, Franklyn J Quinlan, Andrew D Ludlow, Till P Rosenband, Scott A Diddams, David Allan Howe
Abstract: We implement an ultra-low-noise frequency divider chain from 8 GHz to 5 MHz that utilizes custom-built regenerative frequency divide-by-2 circuits. The single-sideband (SSB) residual phase noise of this regenerative divider at 5 MHz output is -163 dB ...

674. Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top
Topic: Physics
Published: 12/21/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Chan La-O-Vorakiat, Henry C. Kapteyn, Margaret M. Murnane, Stefan Mathias, Roman Adam, Patrik Grychtol, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Dennis Rudolf
Abstract: We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - ...

675. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...

676. Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider
Topic: Physics
Published: 8/15/2011
Authors: Franklyn J Quinlan, Tara Michele Fortier, Matthew Steven Kirchner, Jennifer A. Taylor, Michael J. (Michael) Thorpe, Nathan D. Lemke, Andrew D Ludlow, Yanyi Jiang, Christopher W Oates, Scott A Diddams
Abstract: We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cry ...

677. Uncertainty analysis for a high-spatial resolution single-mode fiber-optic distributed temperature sensor
Topic: Physics
Published: 11/17/2011
Authors: Shellee Dawn Dyer, Michael Tanner, Burm Baek, Robert Hadfield, Sae Woo Nam
Abstract: We demonstrate a high-accuracy distributed fiber optic temperature sensor using superconducting nanowire single-photon detectors and single photon counting techniques. Our demonstration uses inexpensive single-mode fiber at standard telecommunication ...

678. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...

679. Universal Crossover Function and Non-Universal Order-Parameter Profiles for Critical Adsorption
Topic: Physics
Published: 12/1/1999
Authors: S B Kiselev, L L Lue, M Yu Belyakov

680. Update on a Comparison of Cesium Fountain Primary Frequency Standards
Topic: Physics
Published: 7/31/2011
Author: Thomas Edward Parker
Abstract: An update to a previous long term frequency comparison of cesium fountain primary frequency standards has been made. This update covers the approximate three year interval from March 2008 to March 2011 and also includes two new standards. Also, simul ...

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