Affiliation:
1. The University of Tokyo
Abstract
We demonstrate high harmonic generation from GaSe in the deep-UV range with its photon energy reaching three times the bandgap energy. The harmonic spectrum represents a clear dependence on the crystal orientation with respect to the incident field, reflecting the
6
¯
2
m
point group. This reflection indicates the possibilities of high harmonic spectroscopy and high harmonic waveform control at frequencies well above the bandgap. The 3D time-dependent density matrix simulations reveal that the interband polarization mechanism dominates over the intraband current mechanism at frequencies above the bandgap and can generate attosecond bursts with characteristic sine-like waveforms.
Funder
Japan Science and Technology Agency
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Cited by
4 articles.
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