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Physics

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Displaying 1751 - 1775 of 2574

Exploiting shot noise correlations in the photodetection of ultrashort optical pulse trains

March 10, 2013
Author(s)
Franklyn J. Quinlan, Tara M. Fortier, Haifeng (. Jiang, Archita Hati, Craig W. Nelson, Yang Fu, J. C. Campbell, Scott A. Diddams
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 noise

Energy levels and spectral lines of singly ionized manganese (Mn II)

March 7, 2013
Author(s)
Alexander Kramida, Jean E. Sansonetti
This compilation revises the previously recommended list of energy levels of singly ionized manganese (Mn II) and provides a comprehensive list of observed spectral lines and transition probabilities in this spectrum. The new level optimization takes into

Shifts of optical frequency references based on spectral hole burning in Eu3+:Y2SiO5

March 6, 2013
Author(s)
David R. Leibrandt, Michael J. Thorpe, Till P. Rosenband
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 field

1932 A watershed year in nuclear physics

March 4, 2013
Author(s)
Joseph Reader, Charles W. Clark
1932 was the year for an amazing series of discoveries in physics. This started with the announcement of the discovery of deuterium, followed by the discoveries of the neutron and the positron, as well as artificial disintegration of nuclei by accelerators

Atom numbers in magneto-optic traps with millimeter scale laser beams

February 22, 2013
Author(s)
Gregory W. Hoth, Elizabeth A. Donley, John E. Kitching
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 3.6 scaling law observed for larger MOTs is a robust approximation for optimized

Cavity-stabilized laser with acceleration sensitivity below 10 -12 /g -1

February 21, 2013
Author(s)
David R. Leibrandt, James C. Bergquist, Till P. Rosenband
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

New Version: Grasp2K Relativistic Atomic Structure Package

February 19, 2013
Author(s)
P. Jonsson, G. Gaigalas, J Bieron, Charlotte F. Fischer, I. P. Grant
A revised version of Grasp2K [P. Jonsson, X. He, C. Froese Fischer, and I.P. Grant, Comput. Phys. Commun. 177 (2007) 597] is presented. It supports earlier non-block and block versions of codes as well as a new block version in which the njgraf library

A One-Kilogram Quartz Resonator as a Mass Standard

February 1, 2013
Author(s)
David A. Howe, J Vig
The unit of mass, the kilogram, is the last remaining SI base unit defined by an artifact” [1]. This artifact, the primary mass standard, suffers from long term instabilities that are neither well understood, nor easily monitored [2]. A mass standard

Techniques for microwave near-field quantum control of trapped ions

January 31, 2013
Author(s)
Ulrich J. Warring, C. Ospelkaus, Yves Colombe, Kenton R. Brown, Jason Amini, M Carsjens, Dietrich G. Leibfried, David J. Wineland
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 and

Tunnel junction sensors for HCI-surface measurements at low kinetic energies

January 25, 2013
Author(s)
Joshua M. Pomeroy, Russell E. Lake
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)

Improvements in silicon oxide dielectric loss for superconducting microwave detector circuits

January 24, 2013
Author(s)
Dale Li, Jason Austermann, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Anna E. Fox, Nils Halverson, Jason Henning, Gene C. Hilton, Johannes Hubmayr, Jeffrey L. Van Lanen, John P. Nibarger, Michael D. Niemack, Kent D. Irwin
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 chemical

NIST Time and Frequency Bulletin

January 18, 2013
Author(s)
Petrina C. Potts
The Time and Frequency Bulletin provides information on performance of time scales and a varieth of broadcasts (and related information) to users of the NIST services.

Standardization of Broadband UV Measurements

January 1, 2013
Author(s)
George P. Eppeldauer
The CIE standardized rectangular-shape UV response functions can be realized only with large spectral mismatch errors. The spectral power-distribution of UV sources is not standardized. Accordingly, the readings of different types of UV meters, even if

The spectrum of Fe II

January 1, 2013
Author(s)
Gillian Nave, S Johansson
The spectrum of singly-ionized iron (Fe II) has been recorded using high-resolution Fourier transform and grating spectroscopy over the wavelength range 900 Å to 5.5 μm. The spectra were recorded in high-current continuous and pulsed hollow cathode

Time Transfer Using a Satellite Navigation System

January 1, 2013
Author(s)
Judah Levine
Article does not have an abstract. It was solicited by the editors of the yearbook and was written based on their detailed comments about the topics to be covered, the technical detail, etc. It is intended for high-school students and contains material

Hybrid Electro-Optically Modulated Microcombs

December 28, 2012
Author(s)
Pascal P. Del'Haye, Scott B. Papp, Scott A. Diddams
Optical frequency combs based on mode-locked lasers have proven to be invaluable tools for a wide range of applications in precision spectroscopy and metrology. Recently, a novel principle of optical frequency comb generation in whispering gallery mode

Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top

December 21, 2012
Author(s)
Thomas J. Silva, Justin M. Shaw, Hans T. 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
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 - on a

A Low-Power, High-Sensitivity Micromachined Optical Magnetometer

December 11, 2012
Author(s)
Rahul R. Mhaskar, Svenja A. Knappe, John E. Kitching
We demonstrate a fiber-optically coupled optical magnetometer based on a microfabricated 87Rb vapor cell in a micromachined silicon sensor head. The cell is optically heated with light at 1.5 mm brought to the cell through an optical fiber and absorbed by
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