Experimental investigation demonstrates deep-ultraviolet high harmonic generation in gallium selenide crystals, indicating new possibilities for attosecond pulse synthesis.
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.
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Imasaka et al. (2022) studied this question.
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