Phase locking of 270-440 GHz Josephson flux flow oscillators

Authors
Mygind, J Koshelets, VP Shitov, SV Filippenko, LV Vaks, VL Baryshev, AM Luinge, W Whyborn, N
Citation
J. Mygind et al., Phase locking of 270-440 GHz Josephson flux flow oscillators, SUPERCOND S, 12(11), 1999, pp. 720-722
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
ISSN journal
09532048 → ACNP
Volume
12
Issue
11
Year of publication
1999
Pages
720 - 722
Database
ISI
SICI code
0953-2048(199911)12:11<720:PLO2GJ>2.0.ZU;2-0
Abstract
External phase locking of a Josephson flux flow oscillator (FFO) to a 10 MH z reference oscillator is demonstrated experimentally in the frequency rang e 270-440 GHz. A linewidth as low as 1 Hz (as determined by the resolution bandwidth of the spectrum analyser) has been measured. This linewidth is fa r below the fundamental level given by shot and thermal noise of the free-r unning tunnel junction. The combination of narrow linewidth, wide band tuna bility and low noise is important for spectral radio astronomy applications .