TY - JOUR
T1 - Cryogenic sapphire oscillator using a low- vibration design pulse-tube cryocooler
T2 - First results
AU - Hartnett, John G.
AU - Nand, Nitin R.
AU - Wang, Chao
AU - Le Floch, Jean Michel
PY - 2010/5
Y1 - 2010/5
N2 - A cryogenic sapphire oscillator (CSO) has been implemented at 11.2 GHz using a low-vibration design pulsetube cryocooler. Compared with a state-of-the-art liquid helium cooled CSO in the same laboratory, the square root Allan variance of their combined fractional frequency instability is σy = 1.4 × 10-15τ-1/2 for integration times 1 < τ < 10 s, dominated by white frequency noise. The minimum σy = 5.3 × 10-16 for the two oscillators was reached at τ = 20 s. Assuming equal contributions from both CSOs, the single oscillator phase noise Sφ -96 dB.rad 2/Hz at 1 Hz set from the carrier.
AB - A cryogenic sapphire oscillator (CSO) has been implemented at 11.2 GHz using a low-vibration design pulsetube cryocooler. Compared with a state-of-the-art liquid helium cooled CSO in the same laboratory, the square root Allan variance of their combined fractional frequency instability is σy = 1.4 × 10-15τ-1/2 for integration times 1 < τ < 10 s, dominated by white frequency noise. The minimum σy = 5.3 × 10-16 for the two oscillators was reached at τ = 20 s. Assuming equal contributions from both CSOs, the single oscillator phase noise Sφ -96 dB.rad 2/Hz at 1 Hz set from the carrier.
UR - http://www.scopus.com/inward/record.url?scp=77951899261&partnerID=8YFLogxK
U2 - 10.1109/TUFFC.2010.1515
DO - 10.1109/TUFFC.2010.1515
M3 - Article
C2 - 20442014
AN - SCOPUS:77951899261
SN - 0885-3010
VL - 57
SP - 1034
EP - 1038
JO - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
IS - 5
M1 - 5456252
ER -