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Topic Area: Time and Frequency
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Displaying records 21 to 30 of 53 records.
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21. Hyper-Ramsey spectroscopy of optical clock transitions
Topic: Time and Frequency
Published: 7/22/2010
Authors: Christopher W Oates, V. I. Yudin, A. V. Taichenachev, Zeb Barber, Nathan D. Lemke, Andrew D Ludlow, U Sterr, Ch. Lisdat, F Riehle
Abstract: We present nonstandard optical Ramsey schemes that use pulses individually tailored in duration, phase and frequency to cancel spurious frequency shifts related to the excitation itself. In particular, the field shifts and their uncertainties can be ...

22. A Theoretical and Experimental Analysis of Frequency Transfer Uncertainty, Including Frequency Transfer into TAI
Topic: Time and Frequency
Published: 7/21/2010
Authors: Thomas Edward Parker, Gianna Panfilo
Abstract: In this work we present a study of the determination of frequency transfer uncertainty in time series measurements. The first part of this paper is dedicated to the theoretical study of the frequency uncertainty in relation to the Allan deviation ...

23. Efficient fiber optic detection of trapped ion flourescence
Topic: Time and Frequency
Published: 7/9/2010
Authors: Aaron Vandevender, Yves Colombe, Jason Amini, Dietrich G Leibfried, David J Wineland
Abstract: Integration of fiber optics may play a critical role in the development of quantum information processors based on trapped ions, atoms, and quantum dots. Fibers could help enable a scalable and efficient means of collecting light from and deliverin ...

24. High Spectral purity oscillator at 40 GHz: Design using air-dielectric Cavity
Topic: Time and Frequency
Published: 6/2/2010
Authors: Archita Hati, Craig W Nelson, Billy F Riddle, David Allan Howe
Abstract: We describe the design of a low-PM noise 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to clean up the PM noise of a commercial 10 GHz dielectric resonator oscillator (DRO) multiplied by four. ...

25. Low-Frequency Characterization of MEMS-Based Portable Atomic Magnetometer
Topic: Time and Frequency
Published: 6/2/2010
Authors: Rahul Ramdas Mhaskar, Svenja A Knappe, John E Kitching
Abstract: Atomic magnetometers based on absorption or polarization rotation of light in an alkali vapor have recently demonstrated sensitivities rivaling those of superconducting quantum interference devices (SQUIDs). Miniaturization of such devices containing ...

26. Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain
Topic: Time and Frequency
Published: 6/2/2010
Authors: Thomas Edward Parker, Steven R Jefferts, Thomas Patrick Heavner
Abstract: Abstract Hydrogen masers are used extensively in time scale ensembles, but the frequency drift must be accurately known. NIST-F1, the cesium fountain primary frequency standard at the National Institute of Standards and Technology, now operates nearl ...

27. Phase noise suppression in frequency comb generators
Topic: Time and Frequency
Published: 6/2/2010
Authors: Craig W Nelson, Archita Hati, J F Nava-garcia, David Allan Howe
Abstract: We propose an idea to suppress the flicker (1/f) noise in radio frequency (RF) multiplier based frequency comb generators. Comb generators are often used for frequency multiplication in frequency synthesis. In general, comb generators apply high powe ...

28. A common-view disciplined oscillator
Topic: Time and Frequency
Published: 5/24/2010
Authors: Michael A Lombardi, Aaron P Dahlen
Abstract: This paper describes a common-view disciplined oscillator (CVDO) that locks to a reference time scale through the use of common-view Global Positioning System (GPS) satellite measurements. A Proportional-Integral-Derivative (PID) controller obtains ...

29. 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 ...

30. NIST Time and Frequency Bulletin
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Time and Frequency
Published: 1/5/2010
Author: Eyvon Petty
Abstract: The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services)

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