Abstract
This work investigates the characteristics of collinear photon channels in the two-color vortex high-order harmonic generation, and proposes a method to generate the harmonic vortices with well-defined and tunable orbital angular momentum.
Highlights
In the past years, remarkable advances have been achieved in the field of ultrafast optics [1,2,3,4,5,6,7]
We focus on the characteristics of collinear photon channels in the two-color vortex high-order harmonic generation (HHG) and propose a scheme to tune the orbital angular momentum (OAM) of the harmonics
We find that the n-ω fundamental photon channel for nth-order harmonic is suppressed even if the ratio of the intensities I2ω/Iω is very small
Summary
Remarkable advances have been achieved in the field of ultrafast optics [1,2,3,4,5,6,7]. The characteristics of the collinear photon channel possesses rich connotation of physics, which has not been clearly investigated and needs to be further studied Another topic for configuration of the driving field refers to the helical-phased beams, i.e., the so-called optical vortices. As light-matter interaction is inherently connected with the exchange of momentum, OAM can be naturally transferred to high-order harmonics via HHG process [17,18,19,20] This gives an additional degree of complexity to shape the laser field for the engineering of the HHG beams. Our scheme of tuning OAM by manipulating the collinear photon channels may combine with other traditional controlling methods in HHG (e.g., wave- form synthesis scheme, phasematching technique), which opens a promising perspective in the generation of helical attosecond or even isolated attosecond pulses with tunable and well-defined OAMs
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