We report amplification of pulses as short as 400 ps in a 1 kW, 140 GHz gyro-TWT amplifier. To our knowledge, this is the first observation of picosecond pulse amplification in a gyro-amplifier. The pulses show measurable broadening due to two distinct phenomena: group velocity dispersion and spectral narrowing due to the finite gain bandwidth. Theoretical analysis is in good agreement with the observed broadening of the pulses. Picosecond pulses are useful for applications in spectroscopy and advanced radar.
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