Extreme-ultraviolet (EUV) attosecond vortices carrying orbital angular momentum (OAM) are produced through high-order harmonic generation (HHG) from the nonlinear conversion of infrared twisted beams. While previous works demonstrated a linear scaling law of the vortex OAM content with the harmonic order, an unexpectedly rich scenario for the OAM buildup appears when HHG is driven by a vortex combination. The non-perturbative nature of HHG increases the OAM content of the attosecond vortices when the driving field presents an azimuthally varying intensity profile. We theoretically explore the underlying mechanisms for this diversity and disentangle the perturbative and non-perturbative nature in the generation of EUV attosecond twisted through numerical simulations.
Carlos Hernández García, Laura Rego, Julio San Román, Antonio Picón, and Luis Plaja, "Non-perturbative twist of attosecond extreme-ultraviolet vortex beams," Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 101021C (Presented at SPIE OPTO: February 01, 2017; Published: 23 February 2017); https://doi.org/10.1117/12.2263388.
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