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Two important new results are presented from a study of second harmonic (2ωc) emission from a pulsed gyrotron designed for fundamental (ωc) emission of 200 kW at 28 GHz in the TE021 mode. Simultaneous output at ω1≊ωc and ω2≊2ωc, with the condition ω2=2ω1 applying as ω1 was varied, has been observed for the first time. Strong, single mode 2ωc emission (80 kW at 50 GHz) is also observed, and such emission is shown to be characteristic of gyrotrons designed for high‐power emission at the fundamental.

High-power second harmonic emission and frequency locking in a 28-GHz gyrotron