Title :
Design of a cryogenic dual-mode resonator for a fly-wheel oscillator for a cesium frequency standard
Author :
Tobar, Michael E. ; Hartnett, John G. ; Ivanov, Eugene N. ; Cros, Dominique ; Bilski, Pawel
Author_Institution :
Western Australia Univ., Crawley, WA, Australia
fDate :
6/23/1905 12:00:00 AM
Abstract :
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 1000 seconds. This is sufficient to operate an atomic clock at the quantum projection noise limit
Keywords :
atomic clocks; cavity resonators; dielectric resonator oscillators; finite element analysis; frequency stability; frequency standards; low-temperature techniques; quantum noise; 1 to 1000 sec; 50 to 80 K; Al2O3; Allan deviation; Cs; atomic clock; atomic frequency standard; atomic transition; cryogenic dual-mode resonator; differently polarized modes; finite element software; flywheel oscillator; fractional frequency instability; high-Q whispering gallery sapphire resonator; optimum Q-factor; quantum projection noise limit; resonance frequency; sapphire loaded cavity resonator; Atomic clocks; Cryogenics; Design optimization; Finite element methods; Polarization; Resonance; Resonant frequency; Temperature distribution; Temperature sensors; Testing;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-7028-7
DOI :
10.1109/FREQ.2001.956369
