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Topic Area: Physics

Displaying records 21 to 30 of 774 records.
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21. 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. ...

22. 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 ...

23. 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 ...

24. Early observations of macroscopic quantum jumps in single atoms
Topic: Physics
Published: 7/1/2014
Authors: Wayne M Itano, James C Bergquist, David J Wineland
Abstract: The observation of intermittent fluorescence of a single atomic ion, a phenomenon better known as 'macroscopic quantum jumps,' was an important early scientific application of the three-dimensional rf quadrupole (Paul) trap. The prediction of the phe ...

25. Microresonator frequency comb optical clock
Topic: Physics
Published: 7/1/2014
Authors: Scott B Papp, Katja Melanie Beha, Pascal Patrice Del'Haye, Franklyn J Quinlan, Hansuek Lee, Kerry J. Vahala, Scott A Diddams
Abstract: Optical frequency combs enable measurement precision at the 20th digit, and measurement accuracy entirely commensurate with their reference oscillator. A new direction in experiments is the creation of ultracompact frequency combs by way of nonlinear ...

26. Optical Passive Sensor Calibration for Satellite Remote Sensing and the Legacy of NOAA and NIST Cooperation
Series: Journal of Research (NIST JRES)
Report Number: 119.008
Topic: Physics
Published: 6/26/2014
Authors: Raju VSNU Datla , Michael Weinreb, Joseph Paul Rice, Bettye C Johnson, Eric L Shirley, Changyong Cao
Abstract: This paper traces the cooperative effort of the scientists at the National Oceanic and Atmospheric Administration (NOAA) and the National Institute of Standards and Technology (NIST) for improving the calibration of operational satellite sensors ...

27. Visible-frequency asymmetric transmission devices incorporating a hyperbolic metamaterial
Topic: Physics
Published: 6/17/2014
Authors: Ting Xu, Henri J Lezec

28. Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source
Topic: Physics
Published: 5/30/2014
Authors: Behrang H Hamadani, John F Roller, Andrew M Shore, Brian P Dougherty, Howard W Yoon
Abstract: An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an ar ...

29. 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 ...

30. 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 ...

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