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You searched on: Topic Area: Time and Frequency

Displaying records 1 to 10 of 21 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 D Orloff, Jan Obrzut, Christian John Long, Thomas F. 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. A coherent fiber frequency comb for operation outside the laboratory
Topic: Time and Frequency
Published: 3/13/2014
Authors: Laura C Sinclair, Ian R Coddington, William C Swann, Archita Hati, Kana Iwakuni, Nathan Reynolds Newbury
Abstract: Frequency combs can support cutting-edge measurements in areas that include optical clocks and oscillators, high-accuracy frequency and time transfer, precision spectroscopy from the UV to THz regimes, high-accuracy LIDAR, precise microwave photonic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914649

4. 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

5. The impact of turbulence on high accuracy time-frequency transfer across free space
Topic: Time and Frequency
Published: 6/26/2013
Authors: Laura C Sinclair, Fabrizio Raphael Giorgetta, William C Swann, Esther Baumann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: Atmospheric optical path-length variations are measured across a 2-km optical link through a frequency comb-based system with femtosecond-level precision. Without mitigation, the turbulent piston effect will severely restrict time-frequency trans ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913448

6. 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

7. 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

8. 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

9. 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

10. 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. (Kevin) 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



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