A coherent short wavelength source can be realised with a Free Electron Laser by using High Gain Harmonic Generation configuration. The injection of an external light source in the first part of an undulator results in a coherent light emission in its second part. The SPARC FEL (Fras-cati, Italy), delivering an electron beam at 200 MeV passing through an undulator of 6 sections, can be configured to test such schemes. We propose to use High order Harmonic Generation (HOHG) in gases process as the seed. HOHG produces a coherent XUV source by focusing an intense laser pulse into a gas medium. This beam, composed of odd harmonics of the fundamental laser, is then shaped using a telescope of two spherical mirrors, allowing the focusing at a given position, in the SPARC undulator. Appropriate tuning of the undulator gaps will amplify the 3rd and 5th harmonics seeded, and non-linear harmonics of those wavelengths, allowing the perspective of producing VUV coherent radiation. The chambers for harmonic generation and shaping have been realised and tested at the CEA (Saclay, France). We present these tests.
|Publication status||Published - 2006|
|Event||28th International Free Electron Laser Conference, FEL 2006 - , Germany|
Duration: 1 Jan 2006 → …
|Conference||28th International Free Electron Laser Conference, FEL 2006|
|Period||1/1/06 → …|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Tcherbakoff, O., Labat, M., Lambert, G., Garzella, D., Bougeard, M., Breger, P., ... Giannessi, L. (2006). Seeding the sparc test facility with harmonic generation in gases: Preliminary tests of the harmonic generation in gas chamber. Paper presented at 28th International Free Electron Laser Conference, FEL 2006, Germany.