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Topic Area: Physics

Displaying records 11 to 20 of 768 records.
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11. A 40 GHz Air-Dielectric Cavity Oscillator with Low Phase Modulation
Topic: Physics
Published: 9/1/2014
Authors: Archita Hati, Craig W Nelson, Billy F Riddle, David Allan Howe
Abstract: We describe the design of a low-phase modulated (PM) noise, 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to improve the PM noise of a commercial 10 GHz dielectric resonator oscillator (DRO) f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915948

12. Reducing oscillator PM noise from AM-PM noise correlaiton
Topic: Physics
Published: 8/14/2014
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: We present a new scheme for improving the phase modulated (PM) noise of an oscillator from correlation between amplitude modulated (AM) and PM noise. Experimental results of this correlation effect are presented. An improvement of almost 10 dB in th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916261

13. Measurement of High-Energy (10 keV to 60 keV) X-Ray Spectral Line Widths with eV Accuracy
Topic: Physics
Published: 8/8/2014
Authors: John F Seely, Jack Leigh Glover, Lawrence T Hudson, Yuri Ralchenko, Nino R. Pereira, U. Feldman, C. Di Stefan
Abstract: A high resolution crystal spectrometer (HRCS) utilizing a crystal in transmission geometry has been developed and experimentally optimized to measure the line widths of emission lines in the 10 keV to 60 keV energy range with eV accuracy. The spectro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916219

14. Optically-Pumped Magnetometers for MEG
Topic: Physics
Published: 8/8/2014
Authors: Svenja A Knappe, Tillman H. Sander, Lutz Trahms
Abstract: Optically-pumped magnetometers (OPMs) have seen rapid progress over the last decade in terms of performance and technology development. As highly sensitive room-temperature magnetometers they present several advantages over SQUID sensors, such as the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913989

15. Single-Mode Optical Fiber For High-Power, Low-Loss UV Transmission
Topic: Physics
Published: 8/8/2014
Authors: Daniel H Slichter, Yves Colombe, Andrew C Wilson, Dietrich G Leibfried, David J Wineland
Abstract: We report large-mode-area solid-core photonic crystal fibers made from fused silica which resist UV solarization even at relatively high optical powers. Using a process of hydrogen loading and UV irradiation of the fibers, we demonstrate stable singl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916097

16. Improved Performance, Remote Realization, and Accessibility of the Inter-American Metrology System (SIM) Time Scale
Topic: Physics
Published: 8/7/2014
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: The time and frequency metrology working group of the Inter-American Metrology System (SIM) has developed and currently maintains a number of measurement systems that are designed to coordinate frequency control and timekeeping throughout the America ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915600

17. Tunable spin-spin interactions and entanglement of ions in separate controlled potential wells
Topic: Physics
Published: 8/7/2014
Authors: Andrew C Wilson, Yves Colombe, K. R. Brown, Emanuel H Knill, Dietrich G Leibfried, David J Wineland
Abstract: Inspired by the ideas of Richard Feynman,^d1^ David Deutsch,^d2^ Seth Lloyd^d3^ and others, researchers in the field of quantum information processing and simulation seek to harness the quantum-mechanical properties of well-controlled laboratory sy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914935

18. Enriching 28Si beyond 99.9998 % for semiconductor quantum computing
Topic: Physics
Published: 8/5/2014
Authors: Kevin Joseph Dwyer, Joshua M Pomeroy, David S Simons, June Waiyin Lau, Kristen L Steffens
Abstract: Using a laboratory-scale apparatus, we enrich 28Si to 40 times better than previously reported starting from natural abundance silane gas and offer another source for providing these critical materials from the industrial gas centrifuge methods. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915236

19. Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer
Topic: Physics
Published: 7/31/2014
Authors: John E Kitching, P. Ganssle, H Shin, Scott J Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dimitry Budkerl, Svenja A Knappe, A Pines
Abstract: In this work, we have demonstrated for the first time that an alkali vapor cell magnetometer has sufficient sensitivity to chemically resolve a heterogeneous mixture of oil and water by its relaxation and diffusion properties, both in one dimensional ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914492

20. Electro-optical frequency division and stable microwave synthesis
Topic: Physics
Published: 7/19/2014
Authors: Scott A Diddams, Jiang Li, Xu Li, Hansuek Lee, Kerry J. Vahala
Abstract: Optical frequency division using a mode-locked- laser, frequency comb has revolutionized time keeping and the generation of stable microwave signals. A different approach for optical frequency division and microwave generation using a comb of frequen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915710



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