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We measure spectrally and spatially resolved high-order harmonics generatedin argon using chirped multi-cycle laser pulses. Using a stable,high-repetition rate laser we observe detailed interference structures in thefar-field. The structures are of two kinds; off-axis interference from the longtrajectory only and on-axis interference including the short and longtrajectories. The former is readily visible in the far-field spectrum,modulating both the spectral and spatial profile. To access the latter, we varythe chirp of the fundamental, imparting different phases on the differenttrajectories, thereby changing their relative phase. Using this method togetherwith an analytical model, we are able to explain the on-axis behaviour andaccess the dipole phase parameters for the short (\(\alpha_s\)) and long(\(\alpha_l\)) trajectories. The extracted results compare very well with phaseparameters calculated by solving the time-dependent Schr\"odinger equation.Going beyond the analytical model, we are also able to successfully reproducethe off-axis interference structure.

Spatially and spectrally resolved quantum path interference with chirped driving pulses