Two-loop frequency stabilization using concomitant parameter

V. I. Yudin, A. V. Taichenachev, M. Yu Basalaev, T. Zanon-Willette, J. W. Pollock, M. Shuker, E. A. Donley, J. Kitching

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review


When performing precision measurements, the quantity being measured is often perturbed by the measurement process itself. This includes precision frequency measurements for atomic clock applications carried out with Ramsey spectroscopy. With the aim of eliminating probe-induced perturbations, a method of generalized auto-balanced Ramsey spectroscopy (GABRS) is proposed. Here, the usual local oscillator frequency control loop is supplemented with a second control loop derived from secondary Ramsey sequences interspersed with the primary sequences and with a different Ramsey period. This second loop feeds back to a secondary clock variable and ultimately compensates for the perturbation of the clock frequency caused by the measurements in the first loop. We show that such a two-loop scheme can lead to perfect compensation of measurement-induced light shifts and does not suffer from the effects of relaxation, time-dependent pulse fluctuations and phase-jump modulation errors that are typical of other hyper-Ramsey schemes.

Original languageEnglish
Title of host publication2018 European Frequency and Time Forum, EFTF 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781538656204
Publication statusPublished - 9 Jul 2018
Event2018 European Frequency and Time Forum, EFTF 2018 - Torino, Italy
Duration: 10 Apr 201812 Apr 2018


Conference2018 European Frequency and Time Forum, EFTF 2018


  • atomic clocks
  • light shift
  • Ramsey spectroscopy

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