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We demonstrate theoretically and experimentally the relevance of the transversal coherence length in high-order harmonic generation (HHG). We present results in which transversal phase matching plays the leading role in the macroscopic HHG.
The problem of photoionization by means of the interaction of a pulse beam carrying orbital angular momentum with the hydrogen atom is addressed. This clarifies a fundamental question: the OAM transfer from light to the electron quantum state.
We present an S-matrix based model that provides a quantitative description over a wide range of realistic situations. The generation of radiation of very high harmonic frequencies is a relevant feature arising in the interaction of intense lasers with matter. Besides its theoretical interest as a paradigm of a non-perturbative phenomenon, it also conveys a number of technological applications (generation...
The generation of high power vortices by using volume phase holographic elements is reported. The overall transmission of the vortex generation system is around 20% for lambda=800 nm, because of the difference between recording wavelength (lambda=633 nm) and the reconstruction one. Experimental evolution of transversal profile of intensity when the vortex is focused loosely in air showed the vortex...
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