Superradiance driven by coherent spontaneous emission in a Cherenkov free-electron maser amplifier

Superradiance (SR) initiated by coherent spontaneous emission (CSE) has bee n studied in a 35 GHz high gain free-electron Cherenkov maser. We present e xperimental results that show the development of ultra-short pulses of radi ation in the non-linear superradiant regime which are characterised by a qu adratic dependence of the intensity on the current. The self-similar pulses that develop have a duration that scales inversely with the fourth root of the intensity leading to three cycle long pulses at the highest intensity (few MW). The non-linear SR regime is preceded by a stage of linear exponen tial growth of the microwave pulses with a gain length of 1 cm. The superra diant pulse is shown to evolve from a CSE seed by extrapolating the growth curve. Further confirmation of CSE has been obtained by varying the current pulse shape. By varying the slope of the leading edge, and thus the Fourie r components of the longitudinal spectral density, we are able to vary the strength of the CSE source. We compare the experimental results with a theo retical analysis. (C) 2000 Elsevier Science B.V. All rights reserved.