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Topic Area: Physics
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Displaying records 11 to 20 of 753 records.
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11. 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 ...

12. 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 ...

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

14. 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 ...

15. 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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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