Abstract
It is well known that high-order harmonic generation (HHG) from extended targets differs substantially from that of isolated atoms. Phase matching during propagation plays a major role in defining the extent of the spatial regions in the target that contribute constructively to the final yield. Typically, the understanding of this process is simplified by considering phase-matching effects along the field propagation axis, defining a longitudinal coherence length. In this paper we explore the role of phase matching in the transverse direction. The definition of a transversal coherence length appears fundamental to understanding propagation of harmonics generated by focalized laser beams. We present experimental results----supported by theory---in which transversal phase matching plays the leading role in the macroscopic HHG.
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