Generation of Harmonics and Subharmonics of the Josephson Oscillation

Abstract
The observation of harmonics and subharmonics of the Josephson oscillation is shown to be in agreement with a rather simple model of the junction. The generation of harmonics provides an explanation of induced steps in the current-voltage characteristic which occur at submultiples of the usual induced step voltages. The subharmonic oscillation is seen to be a relaxation-like process which can be easily understood in terms of a mechanical analog.