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You searched on: Topic Area: Time and Frequency

Displaying records 11 to 20 of 26 records.
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11. Optical two-way time and frequency transfer over free space
Topic: Time and Frequency
Published: 4/28/2013
Authors: Fabrizio Raphael Giorgetta, William C Swann, Laura C Sinclair, Esther Baumann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: The transfer of high-quality time-frequency signals between remote locations underpins many applications, including precision navigation and timing, clock-based geodesy, long-baseline interferometry, coherent radar arrays, tests of general relati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912449

12. A method for comparing remote optical clocks over a free-space optical link
Topic: Time and Frequency
Published: 7/9/2012
Authors: William C Swann, Fabrizio Raphael Giorgetta, Ian R Coddington, Esther Baumann, Jean-Daniel Deschenes, Laura C Sinclair, Alexander M. Zolot, Nathan Reynolds Newbury
Abstract: We demonstrate a method to compare optical clocks approaching 10^u-17^ uncertainties through the exchange of optical pulses from phase-locked frequency combs. We discuss results over a 120 m air path and prospects for longer distances.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911076

13. A thickness-shear MEMS resonator employing electromechanical transduction through a coplanar waveguide
Topic: Time and Frequency
Published: 5/21/2012
Authors: Ward L Johnson, Thomas M Wallis, Pavel Kabos, Eduard Rocas, Juan C. Collado Gomez, Li-Anne Liew, Albert Davydov, Alivia Plankis, Paul R Heyliger
Abstract: The design, modeling, fabrication, and characterization of a vibrationally trapped thickness-shear MEMS resonator is presented. This device is intended to avoid various limitations of flexural MEMS resonators, including nonlinearity, clamping losses, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911593

14. Frequency characterization of a swept and fixed-wavelength external-cavity quantum cascade laser by use of a frequency comb
Topic: Time and Frequency
Published: 5/21/2012
Authors: Kevin O. Knabe, Paul A Williams, Fabrizio Raphael Giorgetta, Chris Armacost, Michael Radunsky, Nathan Reynolds Newbury
Abstract: The instantaneous optical frequency of an external-cavity quantum cascade laser (QCL) is characterized by comparison to a near-infrared frequency comb. Fluctuations in the instantaneous optical frequency are analyzed to determine the frequency noise ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911127

15. Two-Way Link for Time Interval Comparison of Optical Clocks over Free-Space
Topic: Time and Frequency
Published: 5/11/2012
Authors: Fabrizio Raphael Giorgetta, William C Swann, Ian R Coddington, Esther Baumann, Jean-Daniel Deschenes, Laura C Sinclair, Alexander M. Zolot, Nathan Reynolds Newbury
Abstract: We demonstrate a free-space link for clock comparisons based on the two-way exchange of pulse trains from combs. The residual uncertainty is 5 * 10^17 in 100 seconds over a 120 m air path, with longer distances possible.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911078

16. Searching for applications with a fine-toothed comb
Topic: Time and Frequency
Published: 4/1/2011
Author: Nathan Reynolds Newbury
Abstract: Frequency combs, like many ground-breaking technologies, are simple in concept; they results from the spectrum of any regular train of optical pulses. What is remarkable is that this simple picture can be actually realized in a number of different ex ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907915

17. The SIM Time Network
Topic: Time and Frequency
Published: 3/1/2011
Authors: Michael A Lombardi, Andrew N Novick, J. Mauricio Lopez-Romero, Francisco Jimenez, Eduardo de Carlos Lopez, Jean-Simon Boulanger, Raymond Pelletier, Ricardo de Carvalho, Raul Solis, Harold Sanchez, Carlos Andres Quevedo, Gregory Pascoe, Daniel Perez, Eduardo Bances, Leonardo Trigo, Victor Masil, Henry Postigo, Anthony Questelles
Abstract: The Sistema Interamericano de Metrologia (SIM) is a regional metrology organization (RMO) whose members are the national metrology institutes (NMIs) located in the 34 nations of the Organization of American States (OAS). The SIM/OAS region extends t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905218

18. Measurement and real-time cancellation of vibration-induced phase noise in a cavity-stabilized laser
Topic: Time and Frequency
Published: 8/30/2010
Authors: Michael J. (Michael) Thorpe, David R Leibrandt, Tara Michele Fortier, Till P Rosenband
Abstract: We demonstrate a method to measure and actively reduce the coupling of vibrations to the phase noise of a cavity-stabilized laser. This method uses the vibration noise of the laboratory environment rather than active drive to perturb the optical cav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905732

19. yocto-Newton force detection sensitivity using trapped ions
Topic: Time and Frequency
Published: 8/22/2010
Authors: Michael J. Biercuk, Joseph Wright Britton, Hermann Uys, Aaron Vandevender, John J Bollinger
Abstract: Recent experimental advances have shown that it is possible to detect forces arising from electric fields at a level of aN/ {square root}Hz (atto {math equal} 10^u-18^ through coupling of micro or nanofabricated mechanical resonators to a variety of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905329

20. How Accurate is a Radio Controlled Clock?
Topic: Time and Frequency
Published: 3/1/2010
Author: Michael A Lombardi
Abstract: This paper discusses the factors that determine the accuracy of radio controlled clocks. The topics covered including the accuracy of the time signal station, path delay, synchronization errors, and the time error that accumulates between synchroniz ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903949



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