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Topic Area: Physics
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Displaying records 21 to 30 of 763 records.
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21. Collapse of the Cross-spectral Function
Topic: Physics
Published: 5/22/2014
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 amplitude and phase conditi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915791

22. Correlation Measurements between PM and AM Noise in Oscillators
Topic: Physics
Published: 5/22/2014
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: We discuss techniques for measuring the correlation between phase modulated (PM) and amplitude modulated (AM) noise in an oscillator and report results of such correlation in a few selected oscillators of similar size, weight, power consumption and v ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915790

23. Frequency Biases in a Cold-Atom Coherent Population Trapping Clock
Topic: Physics
Published: 5/22/2014
Authors: Elizabeth A Donley, Eric Michael Blanshan, Francois-Xavier R. Esnault, John E Kitching
Abstract: A compact cold-atom clock based on coherent population trapping (CPT) has been developed. The clock typically demonstrates a short-term fractional frequency stability of 4x10^u-11^/{square root}{tau} limited by frequency noise on the interrogation l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915857

24. Optical hyperpolarization and NMR detection of ^u129^Xe on a microfluidic chip
Topic: Physics
Published: 5/20/2014
Authors: Ricardo Jimenez Martinez, Daniel J Kennedy, Michael Rosenbluh, Elizabeth A Donley, Svenja A Knappe, Scott J Seltzer, Hattie L Ring, Vikram S. Bajaj, John E Kitching
Abstract: We present a microfluidic chip that enables the production of laser-polarized 129Xe gas and its optical detection. Production of polarized 129Xe and its remote detection is achieved under flowing gas conditions at low magnetic fields in two separate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913663

25. Phase and coherence of optical microresonator frequency combs
Topic: Physics
Published: 5/9/2014
Authors: William Loh, Pascal Patrice Del'Haye, Scott B Papp, Scott A Diddams
Abstract: We investigate the phase and coherence properties of microresonator combs using a combination of theoretical analysis, numerical simulation, and experimental measurement. Our analysis reveals that the comb phase in many cases does not stabilize to an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915304

26. NIST traceable measurements of radiance and luminance levels of night-vision-goggle test-instruments
Topic: Physics
Published: 5/7/2014
Authors: George P Eppeldauer, Vyacheslav B Podobedov
Abstract: In order to perform radiance and luminance level measurements of night-vision-goggle (NVG) test instruments, NIST developed new-generation transfer-standard radiometers (TR). The new TRs can perform low-level radiance and luminance measurements with ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916064

27. First Accuracy Evaluation of NIST-F2
Topic: Physics
Published: 5/1/2014
Authors: Thomas Patrick Heavner, Steven R Jefferts, Jon Hardy Shirley, Thomas Edward Parker, Elizabeth A Donley, Neil Ashby, Stephan E Barlow, Filippo Levi, Giovanni Costanzo
Abstract: We report the first accuracy evaluation of NIST-F2, a second generation laser-cooled Cesium fountain primary standard developed at NIST with a cryogenic (Liquid Nitrogen) microwave cavity and flight region. The 80 K atom interrogation environment re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914839

28. WWVB Time Signal Broadcast: A New Enhanced Broadcast Format and Multi-Mode Receiver
Topic: Physics
Published: 5/1/2014
Authors: John P Lowe, Yingsi Liang, Oren Eliezer, Dinesh Rajan
Abstract: WWVB is a broadcast station, operated by the National Institute of Standards and Technology, that has been broadcasting time information to radio-controlled clocks (RCC) throughout the continental US since 1965. The transmitted information includes t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915289

29. An optically-modulated zero-field atomic magnetometer with suppressed spin-exchange broadening
Topic: Physics
Published: 4/29/2014
Authors: Ricardo Jimenez Martinez, Svenja A Knappe, John E Kitching
Abstract: We implement an optically-pumped 87Rb magnetometer based on a zero-field dispersive resonance enabled by the optical modulation of the 87Rb ground state energy levels. The magnetometer is operated in the spin-exchange relaxation-free regime where hig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914207

30. Time-resolved double-slit interference pattern measurement with entangled photons
Topic: Physics
Published: 4/28/2014
Authors: Lynden Krister Shalm, Thomas Jennewein, Kevin Resch, Piotr Kolenderski, Carmelo Scarcella, Kelsey D. Johnsen Johnsen, Deny Hamel, Cahterine Holloway, Simone Tisa, Alberto Tosi
Abstract: The double-slit experiment strikingly demonstrates the wave-particle duality of quantum objects. In this famous experiment, particles pass one-by-one through a pair of slits and are detected on a distant screen. A distinct wave-like pattern emerg ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913512



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