Direct 825th harmonic mixing of a 1 GHz source with an HCN laser in a Josephson junction
- 21 September 1974
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 7 (14), 1882-1886
- https://doi.org/10.1088/0022-3727/7/14/306
Abstract
Signals near 1 GHz were multiplied in frequency by up to 825 times and mixed with the hydrogen cyanide laser frequency at 891 GHz in point-contact Josephson junctions. The 1 GHz signals were generated by direct multiplication from a 120 MHz quartz-crystal oscillator, and no microwave transfer oscillator was needed. The maximum IF output powers obtained in these and other harmonic mixing experiments (using the same laser) were found to agree quite well with a simple theory which predicts a limit proportional to the square of the frequency being multiplied in the Josephson junction. This provides a criterion for determining the lowest frequency at which to begin multiplication in a Josephson device.Keywords
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