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Topic Area: Physics

Displaying records 41 to 50 of 774 records.
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41. The hyperfine Paschen-Back Faraday effect
Topic: Physics
Published: 3/26/2014
Authors: Svenja A Knappe, M.A. Zentile, Rebecca Andrews, L. Weller, C.S. Adams, I.G. Hughes
Abstract: We investigate experimentally and theoretically the Faraday effect in an atomic medium in the hyperfine Paschen-Back regime, where the Zeeman interaction is larger than the hyperfine splitting. We use a small permanent magnet and a micro-fabricated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915173

42. Dual-polarization-sensitive kinetic inductance detectors for balloon-borne, sub-millimeter polarimetry
Topic: Physics
Published: 3/20/2014
Authors: James A Beall, Daniel T Becker, Justus A Brevik, Hsiao-Mei Cho, Gene C Hilton, Kent D Irwin, Dale Li, David P Pappas, Jeffrey Lee Van Lanen, Johannes Hubmayr
Abstract: We are developing arrays of kinetic inductance detectors for sub-millimeter polarimetry that will be deployed on the BLAST balloon-borne instrument. The array is feedhorn-coupled, and each pixel contains two lumped-element kinetic inductance dete ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914331

43. Optical amplification and pulse interleaving for low noise photonics microwave generation
Topic: Physics
Published: 3/12/2014
Authors: Franklyn J Quinlan, Frederick Nicholas Baynes, Tara Michele Fortier, Qiugui Zhou, Allen Cross, Joe Campbelll, Scott A Diddams
Abstract: We investigate the impact of pulse interleaving and optical amplification on the spectral purity of microwave signals generated by photodetecting the pulsed output of an Er:fiber-based optical frequency comb. It is shown that the microwave phase nois ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915084

44. WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio
Series: Journal of Research (NIST JRES)
Report Number: 119.004
Topic: Physics
Published: 3/12/2014
Authors: Michael A Lombardi, Glenn K Nelson
Abstract: In commemoration of its 50th anniversary of broadcasting from Fort Collins, Colorado, this paper provides a history of National Institute of Standards and Technology (NIST) radio station WWVB. The narrative describes the evolution of the station ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914782

45. Spin dephasing as a probe of Mmde temperature, motional state distributions, and heating rates in a two-dimensional ion crystal
Topic: Physics
Published: 3/10/2014
Authors: Brian C Sawyer, Joseph Wright Britton, John J Bollinger
Abstract: We employ spin-dependent optical dipole forces to characterize the transverse center-of-mass (COM) motional mode of a two-dimensional trapped ion crystal of hundreds of ^u9^Be^u+^. By comparing the measured spin dephasing produced by the spin-depende ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915134

46. A collapse of the cross-spectral function in phase noise metrology
Topic: Physics
Published: 2/25/2014
Authors: Craig W Nelson, Archita Hati, David Allan Howe
Abstract: Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914586

47. Hyperfine structure in 229g-Th^u3+^ as a probe of the 229g-Th -> 229m-Th nuclear excitation energy
Topic: Physics
Published: 2/14/2014
Author: Kyle P Beloy
Abstract: We identify a potential means to extract the 229g-Th -> 229m-Th nuclear excitation energy from precision microwave spectroscopy of the 5F^d5/2,7/2^ hyperfine manifolds in the ion 229g-Th^u3+^. The hyperfine interaction mixes this ground fine structur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914963

48. Supercontinuum generation in an on-chip silica waveguide
Topic: Physics
Published: 2/13/2014
Authors: Scott A Diddams, Dong Yoon Oh, David Sell, Hansuek Lee, Ki Youl Yang, Kerry J. Vahala
Abstract: Supercontinuum generation is demonstrated in an on-chip silica spiral waveguide by launching 180-fs pulses from an optical parametric oscillator at the center wavelength 1330 nm. With a coupled pulse energy of 2.17 nJ, the broadest spectrum in the fu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915135

49. High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in ^u133^Cs
Topic: Physics
Published: 2/7/2014
Authors: Steven R Jefferts, Thomas Patrick Heavner, Thomas Edward Parker, Jon Hardy Shirley, Elizabeth A Donley, Neil Ashby
Abstract: We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of ^u133^Cs ground state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914661

50. Frequency Measurement
Topic: Physics
Published: 2/3/2014
Author: Michael A Lombardi
Abstract: An overview of frequency metrology, with emphasis on estimating accuracy and stability, oscillator types, and measurement instrumentation. It describes how to measure frequency and the statistics and terminology that are used to report the results. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907623



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