Abstract
High-order harmonic generation (HHG) has been recently proven to produce extreme-ultraviolet (XUV) vortices from the nonlinear conversion of infrared twisted beams. Previous works have demonstrated a linear scaling law of the vortex charge with the harmonic order. We demonstrate that this simple law hides an unexpectedly rich scenario for the buildup of orbital angular momentum (OAM) due to the nonperturbative behavior of HHG. The complexity of these twisted XUV beams appears only when HHG is driven by nonpure vortex modes, where the XUV OAM content is dramatically increased. We explore the underlying mechanisms for this diversity and derive a general conservation rule for the nonperturbative OAM buildup. The simple scaling found in previous works corresponds to the collapse of this scenario for the particular case of pure (single-mode) OAM driving fields.
Highlights
High-order harmonic generation (HHG) [1,2,3] represents one of the most fascinating processes in strong-field physics, occurring during the interaction of intense lasers with matter
Previous works have demonstrated a linear scaling law of the vortex charge with the harmonic order. We demonstrate that this simple law hides an unexpectedly rich scenario for the buildup of orbital angular momentum (OAM) due to the nonperturbative behavior of HHG
HHG driven by an OAM beam with a unique topological charge l, studied first theoretically [19] and later experimentally [20], leads to the simple scaling lq 1⁄4 ql
Summary
High-order harmonic generation (HHG) [1,2,3] represents one of the most fascinating processes in strong-field physics, occurring during the interaction of intense lasers with matter. High-order harmonic generation (HHG) has been recently proven to produce extreme-ultraviolet (XUV) vortices from the nonlinear conversion of infrared twisted beams.
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