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    STUDIA PHYSICA - Issue no. SPECIAL ISSUE / 2001  
         
  Article:   HIGH-ORDER HARMONICS IN THE FEW-OPTICAL-CYCLE REGIME.

Authors:  G. CERULLO, S. STAGIRA, M. NISOLI, V. TOSA, C. DE LISIO, R. BRUZZESE, C. ALTUCCI, S. DE SILVESTRI, O. SVELTO, P. BARBIERO, L. POLETTO, G. TONDELLO, P. VILLORESI.
 
       
         
  Abstract:  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.  
         
     
         
         
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