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Topic Area: Physics

Displaying records 81 to 90 of 731 records.
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81. A frequency-stabilized Yb:KYW femtosecond laser frequency comb and its application to low-phase noise microwave generation
Topic: Physics
Published: 3/16/2013
Authors: Scott A Diddams, Stephanie Meyer, Tara Michele Fortier, Steve Lecomte
Abstract: We present an optically-stabilized Yb:KYW fs-laser frequency comb. We use an f-2f nonlinear interferometer to measure the carrier envelope offset frequency (f^d0^) and the heterodyne beatnote between the comb and a stable CW laser at 1068 nm to detec ...

82. Exploiting shot noise correlations in the photodetection of ultrashort optical pulse trains
Topic: Physics
Published: 3/10/2013
Authors: Franklyn J Quinlan, Tara Michele Fortier, Haifeng (Haifeng) Jiang, Archita Hati, Craig W Nelson, Yang Fu, Joe Campbell, Scott A Diddams
Abstract: Photocurrent shot noise represents the fundamental quantum limit of amplitude, phase and timing measurements of optical signals. It is generally assumed that non-classical states of light must be employed to alter the standard, time-invariant shot no ...

83. Shifts of optical frequency references based on spectral hole burning in Eu3+:Y2SiO5
Topic: Physics
Published: 3/6/2013
Authors: David R Leibrandt, Michael J. (Michael) Thorpe, Till P Rosenband
Abstract: Spectral hole burning laser frequency stabilization in Eu3+:Y2SiO5 is performed in a cryogenic environment with high temperature stability and low levels of vibration. Several properties of Eu3+:Y2SiO5 spectral holes are measured, including magnetic ...

84. Atom numbers in magneto-optic traps with millimeter scale laser beams
Topic: Physics
Published: 2/22/2013
Authors: Gregory William Hoth, Elizabeth A Donley, John E Kitching
Abstract: We measure the number of atoms, N, that can be trapped in a conventional vapor cell MOT using beams that have a diameter d in the range 1-5 mm. We show that the N \propto d^u3.6^ scaling law observed for larger MOTs is a robust approximation for opti ...

85. Cavity-stabilized laser with acceleration sensitivity below 10^u-12^/g^u-1^
Topic: Physics
Published: 2/21/2013
Authors: David R Leibrandt, James C Bergquist, Till P Rosenband
Abstract: We characterize the frequency-sensitivity of a cavity-stabilized laser to inertial forces and temperature fluctuations, and perform real-time feed-forward to correct for these sources of noise. We measure the sensitivity of the cavity to linear acce ...

86. Use of the Grand Canonical Transition-Matrix Monte Carlo Method to Model Gas Adsorption in Porous Materials
Topic: Physics
Published: 2/21/2013
Authors: Daniel W Siderius, Vincent K Shen
Abstract: We present grand canonical transition-matrix Monte Carlo (GC-TMMC) as an efficient method for simulating gas adsorption processes, with particular emphasis on subcritical gas adsorption in which capillary phase transitions are present. As in other a ...

87. A One-Kilogram Quartz Resonator as a Mass Standard
Topic: Physics
Published: 2/1/2013
Authors: David Allan Howe, J Vig
Abstract: The unit of mass, the kilogram, is the last remaining SI base unit defined by an artifactŠ [1]. This artifact, the primary mass standard, suffers from long term instabilities that are neither well understood, nor easily monitored [2]. A mass stand ...

88. Techniques for microwave near-field quantum control of trapped ions
Topic: Physics
Published: 1/31/2013
Authors: Ulrich J. Warring, C. Ospelkaus, Yves Colombe, Kenton R. Brown, Jason Amini, M Carsjens, Dietrich G Leibfried, David J Wineland
Abstract: In Ospelkaus et al. [Nature 476, 181 (2011)] a microwave near-field quantum control of spin and motional degrees of freedom of one and two 25Mg+ ions enabled two-ion entanglement. In this report, we extend on the description of the experimental setup ...

89. Tunnel junction sensors for HCI-surface measurements at low kinetic energies
Topic: Physics
Published: 1/25/2013
Authors: Joshua M Pomeroy, Russell Lake
Abstract: In recent years, we have developed and deployed the capability to make and use tunnel junctions sensors (TJS) as extremely sensitive tools for the measurement of surface nanofeatures created by particle surface interactions. Highly charged ion (HCI) ...

90. Improvements in silicon oxide dielectric loss for superconducting microwave detector circuits
Topic: Physics
Published: 1/24/2013
Authors: Dale Li, Jason Austermann, James A Beall, Daniel T Becker, Hsiao-Mei Cho, Anna R.E. Fox, Nils Halverson, Jason Henning, Gene C Hilton, Johannes Hubmayr, Jeffrey Lee Van Lanen, John P Nibarger, Michael D. Niemack, Kent D Irwin
Abstract: Dielectric loss in low-temperature superconducting integrated circuits can cause lower overall efficiency, particularly in the 90 to 220 GHz regime. We present a method to tune the dielectric loss for silicon oxide deposited by plasma-enhanced ch ...

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