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Topic Area: Physics

Displaying records 21 to 30 of 731 records.
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21. 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 ...

22. 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 ...

23. 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 ...

24. 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. ...

25. Head and Media Challenges for 3 Tb/in^u2^ Microwave Assisted Magnetic Recording
Topic: Physics
Published: 2/3/2014
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Mike Mallary, Kumar Srinivasan, Gerado Bertero, Dan Wolf, Christian Kaiser, Michael Chaplin, Mahendra Pakala, Leng Qunwen, Yiming Wang, Carl Elliot, Lui Francis
Abstract: A specific design for Microwave Assisted Magnetic Recording (MAMR) at about 3Tb/in^u2^ (0.47 Tb/cm^u2^ or 4.7 Pb/m^u2^) is discussed in detail to highlight the challenges of MAMR and to contrast its requirements with conventional Perpendicular Magnet ...

26. NIST Time and Frequency Bulletin
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7980-01
Topic: Physics
Published: 2/3/2014
Author: Petrina C Potts
Abstract: The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

27. Time Measurement
Topic: Physics
Published: 2/3/2014
Author: Michael A Lombardi
Abstract: An overview of time metrology, with emphasis on time interval measurements, and time synchronization. It covers the evolution of clocks and timekeeping, time scales, the fundamentals of time measurement, and the various time transfer technique used ...

28. Self-Injection Locking and Phase-Locked States in Microresonator-Based Optical Frequency Combs
Topic: Physics
Published: 1/31/2014
Authors: Pascal Patrice Del'Haye, Scott B Papp, Scott A Diddams, Katja Melanie Beha
Abstract: Microresonator-based optical frequency combs have been under extensive research during the last years. However, the actual comb generation processes are still far from being understood. Different theoretical models have been proposed, however, recent ...

29. Optical phase-noise dynamics of Titanium:sapphire optical frequency combs
Topic: Physics
Published: 1/24/2014
Authors: Qudsia Quraishi, Scott A Diddams, Leo W. Hollberg
Abstract: Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise be ...

30. Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes
Topic: Physics
Published: 1/1/2014
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed ...

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