Abstract
Today, single-pass Free-Electron Lasers (FEL) produced a highly bright radiation, the Self Amplified Spontaneous Emission (SASE), which spectral and temporal profiles are composed of a series of spikes. We have demonstrated the strong and coherent amplification of the 5th harmonic of a Ti: Sa laser (800 nm, 10 Hz, 100 fs) generated in a gas cell, i.e. 160 nm, by the SCSS (SPring-8 Compact SASE Source, Japan) Test Accelerator FEL. This is obtained by overlapping transversally, spectrally and temporally the external harmonic source in the in-vacuum undulator with the electron beam (150 MeV, 10 Hz, 1 ps). With only one undulator section, the 160 nm seeded emission achieves three orders of magnitude higher intensity than the unseeded one, and presents a quasi perfect Gaussian shape in the spectral distribution. With two undulator sections, the seeded FEL spectrum reveals first effects of saturation.
| Original language | English |
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| Pages | 429-431 |
| Number of pages | 3 |
| Publication status | Published - 1 Dec 2008 |
| Event | 30th International Free Electron Laser Conference, FEL 2008 - Gyeongju, Korea, Republic of Duration: 24 Aug 2008 → 29 Aug 2008 |
Conference
| Conference | 30th International Free Electron Laser Conference, FEL 2008 |
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| Country/Territory | Korea, Republic of |
| City | Gyeongju |
| Period | 24/08/08 → 29/08/08 |