We report the first experimental evidence of enhancement of self-amplified spontaneous emission, due to the use of an optical klystron. In this free-electron laser scheme, a relativistic electron beam passes through two undulators, separated by a dispersive section. The latter converts the electron-beam energy modulation produced in the first undulator in density modulation, thus enhancing the free-electron laser gain. The experiment has been carried out at the FERMI facility in Trieste. Powerful radiation has been produced in the extreme ultraviolet range, with an intensity a few orders of magnitude larger than in pure self-amplified spontaneous emission mode. Data have been benchmarked with an existing theoretical model.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Penco, G., Allaria, E., De Ninno, G., Ferrari, E., & Giannessi, L. (2015). Experimental demonstration of enhanced self-amplified spontaneous emission by an optical klystron. Physical Review Letters, 114(1), -. . https://doi.org/10.1103/PhysRevLett.114.013901