Abstract
We investigate the spatio-spectral properties of high-harmonic radiation driven by two laser systems based on i) an optical parametric chirped-pulse amplifier system at 1.55 µm wavelength operating at 125 kHz, ii) a temporally compressed femtosecond ytterbium fiber amplifier at 1.03 µm wavelength and 100 kHz repetition rate. Ring-like structures are observed and explained by the transverse atomic-induced phase.
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