Couprie, M.-E.
(Marie-Emmanuelle Couprie)

MOPOS21 Seeding High Gain Harmonic Generation with Laser Harmonics Produced in Gases
Guillaume Lambert, Bertrand Carré, Yann Mairesse, Pascal Salières (CEA/Saclay, Gif-sur-Yvette), Marie-Emmanuelle Couprie, David Garzella (CEA/SPAM, Gif-sur-Yvette), Andrea Doria, Luca Giannessi (ENEA C.R. Frascati, Frascati - Roma), Toru Hara, Hideo Kitamura, Tsumoru Shintake (RIKEN Spring-8, Hyogo)

Free electron Lasers employing High Gain Harmonic generation (HGHG) schemes are very promising coherent ligth sources for the soft X-ray regime. They offer both transverse and longitudinal coherence, while Self Amplified Spontaneous Emission schemes have a longitudinal coherence limited. We propose here to seed HGHG with high harmonics produced by a Ti:Sa femtosecond laser focused on a gas jet, tuneable in the 100-10 nm spectral region. Specifities concerning the implementation of this particular laser source as a seed for HGHG are investigated. Semi analytical , numerical 1D and 3D calculations are given, for the cases of the SCSS, SPARC and ARC-EN-CIEL projects.