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We present a fully ab initio quantum investigation of the frequency comb structure and coherence within each order of the high-order harmonic generation ͑HHG͒ spectrum in the high-frequency vuv-xuv regime. The HHG spectrum driven by a train of equal-spacing short laser pulses is calculated by propagating the timedependent Schrödinger equation accurately and efficiently by means of the time-dependent generalized pseudospectral method. We explore the comb structure and coherence by varying thedoi:10.1103/physreva.77.031401 fatcat:57clcfve35aofmde5gof25v6ny