Cryogenic dual-mode resonator for a fly-wheel oscillator for a caesium frequency standard.
A dual-mode, sapphire-loaded cavity (SLC) resonator has been designed and optimized with the aid of finite element software. The resonance frequency was designed to be near the frequency of a Cs atomic frequency standard. Experimental tests are shown to agree very well with calculations. The difference frequency of two differently polarized modes is shown to be a highly sensitive temperature sensor in the 50 to 80 K temperature range. We show that an oscillator based on this resonator has the potential to operate with fractional frequency instability below 10(-14) for measurement times of 1 to 100 seconds. This is sufficient to operate an atomic clock at the quantum projection noise limit.
Tobar
Michael E
ME
University of Western Australia, Crawley, Australia. mike@physics.uwa.edu.au
Hartnett
John G
JG
Ivanov
Eugene N
EN
Cros
Dominique
D
Bilski
Pawel
P
D002586:Cesium / Q000737:chemistry*; D003080:Cold Temperature; D004867:Equipment Design; D019544:Equipment Failure Analysis; D004864:Equipment and Supplies / Q000592:standards; D008962:Models, Theoretical; D011846:Radio Waves; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software; D013995:Time
D002586:Cesium