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Progress on prototype synthesizer electronics for 199Hg + at 40.5 GHz

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4 Author(s)
C. W. Nelson ; Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; F. L. Walls ; F. G. Ascarrunz ; P. A. Pond

The design and specifications of a synthesizer for the 199 Hg+ ion standard are presented. A fractional frequency stability of 5×10-15 at 100 s will be required in order to reach the fundamental linewidth imposed by the shot noise of the atomic signal. This might be achieved by first locking a low-noise 5-MHz oscillator to an active hydrogen maser. A 100-MHz oscillator can then be locked up to the 5-MHz oscillator to reduce close-in phase noise. A commercial digital synthesizer can be used to offset-lock a 100.018-MHz oscillator to the 100-MHz signal. Frequency resolution and modulation capabilities will be provided by the digital synthesizer. The 100.018 MHz will be multiplied by five, filtered, amplified, and routed through a step recovery diode. The 81st harmonic will be extracted to probe the hyperfine resonance of 199Hg+ ions. A long-term stability of 6×10-17 is expected from the first prototype

Published in:

Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE

Date of Conference:

27-29 May 1992