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Article Dans Une Revue Optics Letters Année : 2023

Few-cycle optical vortices for strong-field physics

Résumé

We report on the generation of optical vortices with few-cycle pulse durations, 500 μ J per pulse, at a repetition rate of 1 kHz. To do so, a 25 fs laser beam at 800 nm is shaped with a helical phase and coupled into a hollow-core fiber filled with argon gas, in which it undergoes self-phase modulation. Then, 5.5 fs long pulses are measured at the output of the fiber using a dispersion-scan setup. To retrieve the spectrally resolved spatial profile and orbital angular momentum (OAM) content of the pulse, we introduce a method based on spatially resolved Fourier-transform spectroscopy. We find that the input OAM is transferred to all frequency components of the post-compressed pulse. The combination of these two information shows that we obtain few-cycle, high-intensity vortex beams with a well-defined OAM, and sufficient energy to drive strong-field processes.

Dates et versions

cea-04370521 , version 1 (03-01-2024)

Identifiants

Citer

Matthieu Guer, Martin Luttmann, Jean-François Hergott, Fabien Lepetit, Olivier Tcherbakoff, et al.. Few-cycle optical vortices for strong-field physics. Optics Letters, 2023, 49 (1), pp.93. ⟨10.1364/OL.509802⟩. ⟨cea-04370521⟩
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