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Search Publications

NIST Authors in Bold

Displaying 2101 - 2125 of 2503

Improved signal-to-noise ratio of 10 GHz microwave signals generated with a mode-filtered femtosecond laser frequency comb

February 18, 2009
Author(s)
Scott A. Diddams, Matthew S. Kirchner, Tara M. Fortier, Danielle Braje, A. M. Weiner, Leo W. Hollberg
We use a Fabry-Perot cavity to optically filter the output of a Ti:sapphire frequency comb to integer multiples of the original 1 GHz mode spacing. This effectively increases the pulse repetition rate which is useful for several applications. In the case

Prolonging qubit coherence: dynamic decoupling schemes studied in a Penning ion trap

February 2, 2009
Author(s)
Hermann Uys, Michael J. Biercuk, Aaron Vandevender, N. Shiga, Wayne M. Itano, John J. Bollinger
We present a study of dynamical decoupling schemes for the suppression of phase erros due to various noise environments using ions in a Penning ion trap as a model ensemble of qubits. By injecting frequency noise we demonstrate that in an Ohmic noise

HBAR-Based 3.6GHz Oscillator with Low Power Consumption and Low Phase Noise

February 1, 2009
Author(s)
Hongyu Yu, Chuang-yuan Lee, Wei Pang, Hao Zhang, Alan Brannon, John E. Kitching, Eun Sok Kim
We have designed and built two oscillators, based on High-overtone Bulk Acoustic Resonators (HBAR) for application in Chip-Scale Atomic Clocks (CSAC). The measured phase noise of the 3.6-GHz oscillator is -67 dBc/Hz at 300 Hz offset and ?102 dBc/Hz at 10

Stopwatch and Timer Calibrations (2009 edition)

January 28, 2009
Author(s)
Jeff C. Gust, Robert M. Graham, Michael A. Lombardi
Stopwatch and timer calibrations are perhaps the most common calibrations performed in the field of time and frequency metrology. Hundreds of United States laboratories calibrate many thousands of timing devices annually to meet legal and organizational

Nuclear quadrupole resonances in compact vapor cells: The crossover between the NMR and the nuclear quadrupole resonance interaction regimes

January 22, 2009
Author(s)
Elizabeth A. Donley, Jonathan Long, Tara C. Liebisch, Eleanor Hodby, Ted Fisher, John E. Kitching
We trace the transformation of I = 3/2 131-Xe nuclear spin resonances from the pure nuclear quadrupole regime to the quadrupole-perturbed Zeeman regime. We achieve large nuclear quadrupole shifts by using a 1mm 3 cubic cell with walls of different

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009
Author(s)
William C. Griffith, Ricardo Jimenez Martinez, Vishal Shah, Svenja A. Knappe, John E. Kitching
A major limitation on the sensitivity of alkali atomic magnetometers, spin-exchange relaxation, can be completely eliminated by operating at low magnetic field and high alkali density. This allows the miniaturization of atomic magnetometers while retaining

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009
Author(s)
William C. Griffith, Svenja A. Knappe, John E. Kitching, Ricardo Jimenez Martinez, Vishal Shah
High permeability magnetic flux concentrators are used to enhance the sensitivity of an atomic magnetometer operating in the spin exchange relaxation free regime. The magnetometer uses a millimeter scale 87Rb vapor cell and either mu-metal or Mn-Zn ferrite

Laser-produced X-Ray Sources

January 12, 2009
Author(s)
Lawrence T. Hudson, J Seely
A formidable array of advanced laser systems are emerging that produce extreme states of light and matter. By irradiating solid and gaseous targets with lasers of increasing energy densities, new physical regimes of radiation effects are being explored for

Ultra-Low Level Plutonium Isotopes in the NIST SRM 4355A (Peruvian Soil-1)

January 9, 2009
Author(s)
Kenneth G. Inn, Jerome LaRosa, Svetlana Nour, James J. Filliben, George Brooks, Stephen Lamont, Rob Steiner, Ross W. Williams, Brad Patton, Debbie Bostick, Gregory Eiden, Steve Petersen, Donna Beals, James Cadieux, Greg Hall, Steve Goldenberg, Stephen Vogt
For more than 20 years, countries and their agencies which monitor discharge sites and storage facilities have relied on the National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 4355 Peruvian Soil reference material. Its

Multiplexed Readout of CMB Polarimeters

January 5, 2009
Author(s)
Kent D. Irwin
This paper describes contributions to the workshop, 'Technology Development for a CMB Probe of Inflation,' held at NIST in Boulder CO, Aug. 25-28, 2008 concerning technologies to read out direct detectors (including bolometers and microwave kinetic

NIST Time and Frequency Bulletin

January 5, 2009
Author(s)
Eyvon Petty
The Time and Frequency Bulleting provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

Vibration-induced PM noise in oscillators and its suppression

January 1, 2009
Author(s)
Archita Hati, Craig W. Nelson, David A. Howe
High precision oscillators have significant applications in modern communication and navigation systems, radars, and sensors mounted in unmanned aerial vehicles, helicopters, missiles, and other dynamic platforms. These systems must provide their required

Editorial

December 25, 2008
Author(s)
Raymond D. Mountain

Matter-wave self-imaging by atomic center-of-mass motion induced interference

December 18, 2008
Author(s)
Ke Li, Lu Deng, Edward W. Hagley, M.S. Zhan, Marvin G. Payne
We demonstrate matter-wave self-imaging in a stationary light field in the non-Raman-Nath limit. We show that in a non-instantaneous pulsed standing wave grating significant contributions due to the non-negligible atomic center of mass motion and

Development of backlighting sources for Compton radiography diagnostic of Inertial Confinement Fusion targets.

December 8, 2008
Author(s)
Lawrence T. Hudson, A. Tommasini, A MacPhee, D. Hey, T Ma, C. Chen, N Izimi, W Unites, A. MacKinnon, P. Hatchett, B.A. Remington, H.S. Park, P. Springer, J. Koch, O.L. Landen, John F. Seely, G Holland
We present scaled demonstrations of backlighter sources, emitting Bremsstrahlung x rays with photon energies above 75 keV, that we will use to record x-ray Compton radiographic snapshots of cold dense DT fuel in inertial confinement fusion implosions at

A review of time and frequency transfer methods

December 5, 2008
Author(s)
Judah Levine
I will discuss three methods of transmitting time and frequency information: one-way, two-way and common-view. I will describe the advantages and limitations of the different methods including ncertainty estimates for systems that are based on them.

Keeping time in three dimensions

December 1, 2008
Author(s)
Christopher W. Oates
Here I review a paper by Akatsuka et al. that appears in the current volume of Nature Physics. This work describes their latest experimental results on optical lattice clocks, including the first demonstration of a 3-D lattice clock.

Progress on a portable rubidium fountain frequency standard

December 1, 2008
Author(s)
Paul D. Kunz, Thomas P. Heavner, Steven R. Jefferts
We are developing a simple and transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. The optical package for this system uses DFB (distributed feedback) diode lasers and a frequency offset locking scheme to generate the optical
Displaying 2101 - 2125 of 2503
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