InP Gunn devices with two similar graded doping profiles were evaluated for third-harmonic power extraction above 400 GHz. The oscillators used the configuration of a WR-6 waveguide cavity for the InP Gunn device and a WR-2 dielectric-filled conical horn with the appropriate waveguide transition for power measurements with a quasi-optical absolute power meter. The best devices yielded output power levels of 45 µW at 409 GHz, 40 µW at 412 GHz and 40 µW at 422 GHz.
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H. Eisele (2006) studied this question.
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