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

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

715

Lastpage

719

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956369

Filename

956369