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We present calculation of photoexcitation and high-harmonic generation inbulk diamond induced by intense near-infrared laser pulse of photon energy 1.55eV, time duration of 15 fs and peak field strength $F=$ 0.4 V/{\AA}. Dependingon the laser polarization direction, the pulsed irradiation createselectron-hole pairs and transient density fluctuations in a localized region ofthe crystal momentum space. As a consequence energetic inter- and intra-bandharmonics are generated with alternating phase during each half-cycle of thedriving pulse. The corresponding inter- and intra-band currents are in definitephase relation with the laser pulse, reflecting the build-up of coherentsuperposition of population between valence and conduction bands, and theaccelerated motion of charge carriers in their respective bands.

Sub-cycle dynamics of electron-hole pairs and high-harmonic generation in bulk diamond subjected to intense femtosecond laser pulse