Title :
Progress in the building of sapphire-helium clock at LPMO
Author :
Bourgeois, P.Y. ; Kersalé, Y. ; Bazin, N. ; Hartnett, J.G. ; Chaubet, M. ; Giordano, V.
Author_Institution :
Lab. de Phys. et Metrol. des Oscillateurs, CNRS, Besancon, France
Abstract :
We report a new high-Q sapphire whispering gallery mode resonator to achieve ultra high frequency stability. We propose to excite a sapphire resonator in an opened cavity to suppress number of low order spurious modes. Providing the azimuthal order of the chosen whispering gallery mode is high enough, Q-factors better than 2.108 have been observed which turns out to be sufficient to reach a high frequency stability. A realization of a 12 GHz WGH sapphire helium oscillator shows a relative frequency instability of 2·10-14 in terms of standard deviation.
Keywords :
Q-factor; atomic clocks; cavity resonators; crystal oscillators; frequency measurement; frequency stability; helium; sapphire; 12 GHz; Al2O3-He; Q-factor; azimuthal order; cavity resonators; frequency stability; high-Q sapphire whispering gallery mode resonator; relative frequency instability; sapphire helium clock; sapphire helium oscillator; sapphire resonator; standard deviation; Clocks; Frequency; Laser radar; Metrology; Oscillators; Q factor; Stability; Temperature dependence; Temperature sensors; Whispering gallery modes;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International
Print_ISBN :
0-7803-7688-9
DOI :
10.1109/FREQ.2003.1275115
