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Topic Area: Physics

Displaying records 501 to 510 of 777 records.
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501. Spectrally Bright and Broad Fiber-Based Heralded Single-Photon Source
Topic: Physics
Published: 7/29/2008
Authors: Elizabeth A Goldschmidt, M D. Eisaman, Jingyun Fan, Sergey V Polyakov, Alan L Migdall
Abstract: We present the first experimental characterization of a heralded single-photon source based on spontaneous four-wave-mixing in a single-mode microstructure fiber. We measure the second-order correlation function, g(2)(0), to be far below the classi ...

502. Improving Correlations with Inelastic Loss
Topic: Physics
Published: 6/6/2008
Author: James V Porto
Abstract: Correlations are one of the central features of modern condensed matter physics. They arise in systems where the behavior of any given particle in a system depends strongly on all the other particles. Such correlations are what help distinguish the r ...

503. Astronomical spectrograph calibration with broad-spectrum frequency combs
Topic: Physics
Published: 5/29/2008
Authors: Danielle Braje, Matthew Steven Kirchner, Tara Michele Fortier, Scott A Diddams, Leo W. Hollberg, Steve Osterman
Abstract: Broad-band frequency combs are filtered to spectrographically resolvable frequency-mode spacing, and the limitations of using cavities for spectral filtering are considered. Data and theory are used to show implications to spectrographic calibration ...

504. Optical Microchip Detection of Nuclear Magnetic Resonance
Topic: Physics
Published: 5/4/2008
Authors: M Ledbetter, I Savukov, D Budker, Vishal Shah, Svenja A Knappe, John E Kitching, S Xu, D Michalak, A Pines
Abstract: We demonstrate optical detection of nuclear magnetic resonance on a microchip. A theoretical optimization indicates detection limits that are competitive with that demonstrated by microcoils in high magnetic fields, without requiring superconducting ...

505. NIST Physics Laboratory: Technical Activities Report (2005-2007)
Series: Special Publication (NIST SP)
Report Number: 1075
Topic: Physics
Published: 5/1/2008
Authors: William R Ott, Jonathan E Hardis

506. Shear Thinning Near the Critical Point of Xenon
Topic: Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

507. Optical Lattice Induced Light Shifts in a Yb Atomic Clock
Topic: Physics
Published: 3/14/2008
Authors: Zeb Barber, Jason Stalnaker, Nathan D. Lemke, Christopher W Oates, Tara Michele Fortier, Scott A Diddams, Leo W. Hollberg, C Hoyt
Abstract: We present an experimental study of the lattice induced light shifts on the $^1S_0\rightarrow\,^3P_0$ clock transition of ytterbium. The ``magic'' frequency for the $^{174}$Yb isotope was determined to be $u_{magic} = 394\,799\,475(35)$MHz. The diffe ...

508. Large-scale MCHF Calculation of the Li I 4d-4f Energy Separation
Topic: Physics
Published: 11/1/2007
Authors: Yuri Ralchenko, Charlotte Fischer
Abstract: The calculational methods in atomic structure are currently capable of providing the level of accuracy close to that of the most precise experiments. The multiconfiguration Hartree-Fock method is applied to calculation of the 4d--4f energy difference ...

509. Passive Cooling of a Micromechanical Oscillator with a Resonant Electric Circuit
Topic: Physics
Published: 9/28/2007
Authors: Kenton R. Brown, Joseph Wright Britton, Ryan Epstein, John Chiaverini, Dietrich G Leibfried, David J Wineland
Abstract: Currently there is considerable interest in the cooling of macroscopic mechanical oscillators, as strong cooling may allow one to reach the quantum regime of such oscillators. Recent advances in microfabrication and cooling techniques have brought th ...

510. Lattice-based optical clock using an even isotope of Yb
Topic: Physics
Published: 9/12/2007
Authors: Zeb Barber, C Hoyt, Jason Stalnaker, Nathan D. Lemke, Christopher W Oates, Tara Michele Fortier, Scott A Diddams, Leo W. Hollberg
Abstract: We describe progress toward an optical lattice clock based on an even isotope of Yb. The 1S_0 - P_0 clock resonance in 174Yb is accessed using a magnetically induced spectroscopic technique. Using ~1 mT static magnetic fields and ~10 uW of probe ligh ...

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