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Journal Articles Japanese Journal of Applied Physics Year : 2006

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

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John G. Hartnett
  • Function : Author
Clayton R. Locke
  • Function : Author
Shinya Yanagimachi
  • Function : Author
Takeshi Shimazaki
  • Function : Author
Takeshi Ikegami
  • Function : Author
Shin-Ichi Ohshima
  • Function : Author

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 × 108 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 × 10-15 at an integration time of 510 s, which is approximately two times better than that without power servo control.
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Dates and versions

hal-03801653 , version 1 (06-10-2022)

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Cite

Ken-Ichi Watabe, John G. Hartnett, Clayton R. Locke, Giorgio Santarelli, Shinya Yanagimachi, et al.. Reference Signal Synthesized from a Cryogenic Sapphire Oscillator Improved by Power Control Servo. Japanese Journal of Applied Physics, 2006, 45, pp.2827. ⟨10.1143/JJAP.45.2827⟩. ⟨hal-03801653⟩
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