Cryogenic Sapphire Oscillator using a low-vibration design pulse-tube cryocooler: First results

Details Cryogenic Sapphire Oscillator using a low-vibration design pulse-tube cryocooler: First results Cryogenic Sapphire Oscillator using a low-vibration design pulse-tube cryocooler: First results

2010-04-04

arxiv.org/abs/1004.0488v1

IEEE Trans.Ultrason.Ferroelectr.Freq.Control 57:1034-1038, 2010

Physics

Instrumentation and Detectors

5 pages, 5 figures, accepted in IEEE Trans on Ultrasonics, Ferroelectrics and Frequency Control

Scientific paper

A Cryogenic Sapphire Oscillator has been implemented at 11.2 GHz using a low-vibration design pulse-tube cryocooler. Compared with a state-of-the-art liquid helium cooled CSO in the same laboratory, the square root Allan variance of their combined fractional frequency instability is $\sigma_y = 1.4 \times 10^{-15}\tau^{-1/2}$ for integration times $1 < \tau < 10$ s, dominated by white frequency noise. The minimum $\sigma_y = 5.3 \times 10^{-16}$ for the two oscillators was reached at $\tau = 20$ s. Assuming equal contributions from both CSOs, the single oscillator phase noise $S_{\phi} \approx -96 \; dB \; rad^2/Hz$ at 1 Hz offset from the carrier.

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