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Topic Area: Time and Frequency
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Displaying records 1 to 10 of 60 records.
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1. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Time and Frequency
Published: 7/23/2014
Authors: Nathan Daniel Orloff, Jan Obrzut, Christian John Long, Thomas Fung Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915011

2. Time-domain stabilization of carrier-envelope phase in femtosecond light pulses
Topic: Time and Frequency
Published: 5/7/2014
Authors: Young-Jin Kim, Ian R Coddington, William C Swann, Nathan Reynolds Newbury, Joohyung Lee, Seungchul Kim, Seung-Woo Kim
Abstract: We report a time-domain method of stabilizing the carrier-envelope phase (CEP) of femtosecond pulses. Temporal variations of the pulse envelope and the carrier electric-field phase were separately detected with the aid of intensity cross-correlat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915618

3. Optical phase noise from atmospheric fluctuations and its impact on optical time-frequency transfer
Topic: Time and Frequency
Published: 2/5/2014
Authors: Laura C Sinclair, Fabrizio Raphael Giorgetta, William C Swann, Esther Baumann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: The time of flight for a laser beam through the atmosphere will fluctuate as the path-averaged index of refraction varies with atmospheric turbulence, air temperature, and pressure. We measure these fluctuations by transmitting optical pulses fro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915083

4. Time Measurement
Topic: Time and Frequency
Published: 2/3/2014
Author: Michael A Lombardi
Abstract: An overview of time metrology, with emphasis on time interval measurements, and time synchronization. It covers the evolution of clocks and timekeeping, time scales, the fundamentals of time measurement, and the various time transfer technique used ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907332

5. Free-space optical time-frequency transfer over 2 km
Topic: Time and Frequency
Published: 6/9/2013
Authors: William C Swann, Fabrizio Raphael Giorgetta, Laura C Sinclair, Esther Baumann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: Precision free-space time-frequency transfer could advance fields where present microwave-based transfer is inadequate. We demonstrate an optical free-space link with femtosecond timing deviation and residual instability below 10^u−18^ at 1 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913276

6. Stabilization of the offset frequency of an all polarization-maintaining fiber erbium frequency comb
Topic: Time and Frequency
Published: 6/9/2013
Authors: Laura C Sinclair, Ian R Coddington, William C Swann, Nathan Reynolds Newbury
Abstract: We demonstrate a completely polarization-maintaining fiber frequency comb operating at a 200 MHz repetition rate and show initial phase-locking of the carrier-envelope offset frequency. This design is compatible with a robust, fieldable frequency ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913273

7. 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

8. Towards Timely Intelligence in the Power Grid
Topic: Time and Frequency
Published: 2/25/2013
Authors: YaShian Li-Baboud, Julien Marc Amelot, Dhananjay Anand, Gerard Nordeen Stenbakken, Thomas L Nelson, James Moyne
Abstract: One of the key lessons learned from the 2003 Northeast Blackout in the United States was the need for improved timing. The problem began as an isolated issue, but cascaded through the Northeastern grid. Timely situational awareness would likely have ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913150

9. In Search of a New Primary GPS Receiver for NIST
Topic: Time and Frequency
Published: 11/26/2012
Author: Marc Abbott Weiss
Abstract: A previous publication showed problems with the current NIST Time and Frequency Division primary GPS receiver [1] when used for Precise Point Positioning (PPP)-based carrier phase time transfer. We confirm that, for this receiver, boundary discontinu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912972

10. 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



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