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The 13th harmonic of a Ti:sapphire (TiS) laser in the extreme ultraviolet region, which was efficiently generated with a loose focusing geometry, was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier. When the amplification conditions were fulfilled, strong enhancement of the radiation intensity by a factor of 650 was observed. The random and uncontrollable spikes, which...
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