A GaAs tunnel injection transit-time (TUNNETT) diode on a diamond heatsink yielded the state-of-the-art RF power level of more than 140 µW at 355 GHz in third-harmonic mode. The oscillator used the configuration of a WR-10 waveguide cavity for the TUNNETT diode and a WR-2 dielectric-filled conical horn with the appropriate waveguide transition for power measurements with a quasi-optical absolute power meter.
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H. Eisele (2005) studied this question.
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