Title :
Progress in the development of cryogenic sapphire resonator oscillator at NMIJ/AIST
Author :
Watabe, K. ; Hartnett, J.G. ; Locke, C.R. ; Santarelli, G. ; Yanagimachi, S. ; Ikegami, T. ; Ohshima, S.
Author_Institution :
Nat. Metrol. Inst. of Japan (NMIJ), AIST, Tsukuba, Japan
Abstract :
In this paper, we describe the progress in the development of a cryogenic sapphire oscillator (CSO) at NMIJ, AIST. The oscillator was based on a high Q-factor cryogenic-sapphire-resonator cooled with liquid helium which operates on a Whispering Gallery mode. Two CSOs (CSO1 and CSO2) have been built to evaluate their stability at short averaging times. We measured a fractional frequency stability of 1.1 × 10-15 at averaging times of 1 s and a minimum frequency instability of 5.5 × 10-16 at averaging times of 20 s.
Keywords :
cryogenics; crystal oscillators; crystal resonators; sapphire; CSO; NMIJ-AIST; Q-factor cryogenic-sapphire-resonator oscillator; fractional frequency stability; liquid helium; time 20 s; whispering gallery mode; Frequency control; Frequency modulation; Oscillators; Resonant frequency; Servomotors; Time frequency analysis;
Conference_Titel :
Frequency and Time Forum (EFTF), 2006 20th European
Conference_Location :
Braunschweig
Print_ISBN :
978-1-4673-2642-1
