Reference Signal Synthesized from a Cryogenic Sapphire Oscillator Improved by Power Control Servo

K. Watabe, John Hartnett, Clayton Locke, G. Santarelli, S. Yanagimachi, T. Shimazaki, T. Ikegami, S. Ohshima

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Improvements in the frequency stability of a reference signal synthesized from a cryogenic sapphire oscillator (CSO) have been realized. This has been achieved by a power control servo with active Pound frequency stabilization in the loop oscillator based on a high Q-factor cryogenic sapphire resonator with a loaded Q-factor of 5 x 10(8) at 10.812 GHz and operating at a temperature of 6 K. The reference signal of 100 MHz was synthesized from the 10.812 GHz oscillation frequency. When compared with a 100 MHz hydrogen maser signal, the 100 MHz reference exhibited a fractional frequency stability of 5.6 x 10(-15) at an integration time of 510s, which is approximately two times better than that without power servo control.
Original languageEnglish
Pages (from-to)2827-2829
JournalJapanese Journal of Applied Physics
Volume45
Issue number4A
DOIs
Publication statusPublished - 2006

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