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Optics Letters


  • Vol. 26, Iss. 9 — May. 1, 2001
  • pp: 635–637

Cesium optical atomic clock: an optical pulse that tells the time

Masataka Nakazawa and Kazunori Suzuki  »View Author Affiliations

Optics Letters, Vol. 26, Issue 9, pp. 635-637 (2001)

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We propose a new cesium (Cs) atomic clock whose microwave source is a 9.1926-GHz harmonically and regeneratively mode-locked erbium fiber laser rather than a quartz oscillator and a multiplexer. The repetition rate of the laser is directly locked to the Cs resonance, and the frequency stability evaluated by the Allan variance is 7.1 × 10-12 for τ = 1 s. This new atomic clock provides not only a precise 1-s time standard after demultiplexing but also an optical pulse train with the same stability, which means that the ultrastable clock signal can be delivered throughout the world by means of optical fiber networks.

© 2001 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4050) Lasers and laser optics : Mode-locked lasers
(300.0300) Spectroscopy : Spectroscopy

Masataka Nakazawa and Kazunori Suzuki, "Cesium optical atomic clock: an optical pulse that tells the time," Opt. Lett. 26, 635-637 (2001)

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