Microwave oscillator using piezoelectric thin-film resonator aiming for ultraminiaturization of atomic clock

M. Hara, Y. Yano, M. Kajita, H. Nishino, Y. Ibata, M. Toda, S. Hara, A. Kasamatsu, H. Ito, T. Ono, T. Ido

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We developed a microwave oscillator and a micro electromechanical systems-based rubidium cell for the miniaturization of atomic clocks. A thin-film bulk acoustic resonator (FBAR) having a resonant frequency of the fundamental mode in the 3.5 GHz band was employed instead of a crystal resonator. It delivers a clock transition frequency of Rb atoms of 3.417 GHz without the need for a complicated frequency multiplication using a phase-locked loop. This topology considerably reduces the system scale and power consumption. For downsizing the atomic clock system toward the chip level as well as mass production, a microfabricated gas cell containing Rb and N2 gases was also developed. These microcomponents were incorporated into an atomic clock test bench, resulting in a clock operation with a short-term frequency instability of 2.1 × 10-11 at 1 s. To the best of our knowledge, this is the first report of a coherent population trapping clock operation using an FBAR-based microwave oscillator as well as a microfabricated gas cell.

Original languageEnglish
Article number105002
JournalReview of Scientific Instruments
Volume89
Issue number10
DOIs
Publication statusPublished - 2018 Oct 1

ASJC Scopus subject areas

  • Instrumentation

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