Laser-solid interaction was investigated numerically by simulating the Bloch electron wave-packet dynamics in periodic potentials. We introduce a quasi-classical model in the k space combined with the energy band structure to reveal the mechanisms of high-order harmonic generation (HHG) processes occurring in a sub-cycle timescale. We also propose an efficient way to enhance the yield of HHG in inhomogeneous laser fields below the damage threshold.

© 2016 Optical Society of America

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