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Topic Area: Physics

Displaying records 31 to 40 of 777 records.
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31. 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 ...

32. 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 ...

33. 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 ...

34. 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 ...

35. 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 ...

36. 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 ...

37. 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 ...

38. 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 ...

39. 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 ...

40. 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 ...

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