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We report with single particle simulations that longitudinal chromatism, acommonly occuring spatio-temporal coupling in ultrashort laser pulses, can havea significant influence in the longitudinal acceleration of electrons viahigh-power, tightly-focused radially polarized laser beams. This effect can beadvantageous, and even more-so when combined with small values of temporalchirp. However, the effect can also be highly destructive when the magnitudeand sign of the longitudinal chromatism is not ideal, even at very smallmagnitudes. This motivates the characterization and understanding of thedriving laser pulses, and further study of the influence of similar low-orderspatial-temporal couplings on such acceleration.

Influence of longitudinal chromatism on vacuum acceleration by intense radially polarized laser beams