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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...
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