The present invention relates to a high-power gyrotron for generating electromagnetic millimetric or sub-millimetric waves, using a quasi-optical resonator. The latter is formed by two hollow mirrors (1, 2) arranged opposite one another on an optical axis. In order to increase the decoupling efficiency and to reduce the emission to the environment, the quasi-optical resonator is arranged in a housing (4) which is electrically conductive, at least in sections. …IMAGE…
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