J. Phys. IV France
Volume 11, Numéro PR2, Juillet 2001
X-Ray Lasers 2000
Page(s) Pr2-351 - Pr2-354
7th International Conference on X-Ray Lasers

J. Phys. IV France 11 (2001) Pr2-351-Pr2-354

DOI: 10.1051/jp4:2001268

Beam divergence of high-order harmonics generated in the few-optical cycle regime

C. Altucci1, R. Bruzzese2, C. de Lisio2, V. Tosa2, 3, P. Barbiero4, L. Poletto4, G. Tondello4, P. Villoresi4, M. Nisoli5, S. Stagira5, G. Cerullo5, S. De Silvestri5 and O. Svelto5

1  INFM, Unità di Napoli, Dipartimento di Chimica, Università della Basilicata, Potenza, ltaly
2  INFN, Unità di Napoli, Dipartimento di Scienze Fisiche, Università di Napoli "Federico II", Napoli, ltaly
3  National Institute of Isotopic and Molecular Technology, Cluj-Napoca, Romania
4  INFM, Unità di Padova, Laboratorio di Elettronica Quantistica - DEI, Università di Padova, Padova, ltaly
5  INFM, Unità di Milano, Centro di Elettronica Quantistica e Strumentazione Elettronica - CNR, Dipartimento di Fisica, Politecnico, Milano, ltaly

The beam divergence of high-order harmonics generated in Helium by an ultra-short Ti:sapphire laser (7 fs and 30 fs) is experimentally characterized by means of a flat-field, high-resolution spectrometer. The harmonic beam divergence is also analysed as a function of the gas-jet position relative to the laser beam waist. Results, which are partly different from previous measurements performed at longer laser pulse duration, are discussed.

© EDP Sciences 2001