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Displaying records 521 to 530 of 789 records.
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521. 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 ...

522. 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 ...

523. Frequency-Tunable Josephson Junction Resonator for Quantum Computing
Topic: Physics
Published: 6/23/2007
Authors: Kevin Osborn, Joshua Strong, Adam Joseph Sirois, Raymond Wiley Simmonds
Abstract: We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10%. Weak coupling to the environment allows a quality factor of 7000 in ...

524. Optical Fiber Vibration and Acceleration Model
Topic: Physics
Published: 5/29/2007
Authors: Neil Ashby, David Allan Howe, Jennifer A. Taylor, Archita Hati, Craig W Nelson
Abstract: We derive expressions for the group velocities of transverse electric and transverse magnetic electromagnetic waves in a stretched single-mode fiber. Stretching can occur either as a result of temperature changes of the spool on which the fiber is wo ...

525. Self-Injection Locking of a Low-Power Microwave Oscillator by Using 4-Wave Mixing in an Atomic Vapor
Topic: Physics
Published: 5/29/2007
Authors: Alan Brannon, Vladislav Gerginov, V Shah, Svenja A Knappe, Z Popovic, Leo W. Hollberg, John E Kitching
Abstract: We demonstrate self-injection locking of a compact microwave oscillator by using feedback generated from four-wave mixing in an atomic vapor. The four-wave mixing process creates an effective microwave filter with extremely high off-resonant signal s ...

526. Testing Local Position Invariance with Four H Masers AND Four Cs Fountains
Topic: Physics
Published: 5/28/2007
Authors: Neil Ashby, Thomas Patrick Heavner, Steven R Jefferts, A Radnaev, Y Dudin
Abstract: We report the most sensitive tests to date of the assumption of local position invariance (LPI) underlying general relativity, based on a seven year comparison of cesium and hydrogen atomic clocks (frequency standards). The latest results place an up ...

527. 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 ...

528. 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- ...

529. 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 ...

530. 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 ...

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