High-order harmonic beam was injected as a seeding source to a 250-MeV free-electron-laser amplifier. When the amplification conditions were satisfied, strong enhancement of the radiation intensity by a factor of 650 was observed at a wavelength of 61.5 nm. The random and uncontrollable spikes, which appeared in the spectra of the Self-Amplified Spontaneous Emission based FEL radiation without the seeding pulse, were found to be suppressed drastically to form to a narrow-band, single peak profile at the seeding wavelength. The properties of the seeded FEL radiation were well reproduced by numerical simulations. © Springer-Verlag Berlin Heidelberg 2012.
CITATION STYLE
Takahashi, E. J., Togashi, T., Aoyama, M., Yamakawa, K., Sato, T., Iwasaki, A., … Ishikawa, T. (2012). Enormous amplification of full-coherent radiation in the extreme ultraviolet region with a free-electron laser. In Springer Proceedings in Physics (Vol. 125, pp. 155–161). Springer Science and Business Media, LLC. https://doi.org/10.1007/978-3-642-28948-4_25
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