Stimulated emission of microwave radiation by long Josephson junction: Josephson maser

New way of using long josephson junction for producing microwave radiation based on the idea that moving solitons in josephson junction getting interacted with synchronous electromagnetic wave in some wavegide system can amplify it just the same as electron beam acts in usual electronic devices is proposed. Simple system realizing this principle is considered. Equations for mutual dynamics of solitons and radiation are derived and it is shown that solitons moving due to external current can amplify waveguide mode when phase velocity of linear mode is close enough to velocity of solitons. Maximal output power and optimal parameters of the proposed system are estimated.