Autonomous cryogenic sapphire oscillators employing low vibration pulse-tube cryocoolers at NMIJ. (June 2016) - Ikegami, Takeshi
Abstract: Two liquid-helium-cooled cryogenic sapphire-resonator oscillators (CSOs), have been modified to operate using cryo-refrigerators and low-vibration cryostats. The Allan deviation of the first CSO was evaluated to be better than 2 x 10 -15 for averaging times of 1 s to 30 000 s, which is better than that of the original liquid helium cooled CSO. The Allan deviation of the second CSO is better than 4 x 10 -15 from 1 s to 6 000 s averaging time.