Zuerch Lab
ULTRAFAST OPTICAL & X-RAY SPECTROSCOPY | ULTRAFAST IMAGING | ATTOSCIENCE
Zuerch Lab
ULTRAFAST OPTICAL & X-RAY SPECTROSCOPY | ULTRAFAST IMAGING | ATTOSCIENCE

Solid State Higher Harmonic Generation (sHHG)

Solids can be used as a medium to generate harmonics of an intense laser pulse. While gas-phase higher harmonic generation (HHG) is widely used in generating attosecond pulses, recently, solid state higher harmonic generation (sHHG) has gained attention. Compared to HHG, sHHG has richer dynamics due to the periodic structure of the dense medium. Rather than the well-established semi-classical tunnel ionization description that explains HHG (c-d), sHHG process involves tunnel ionization followed by interactions of the charge carriers with the periodic lattice potentials. Therefore, sHHG contains valuable information about the band structure of solids (a-b). Uniquely equipped with a CEP stabilized tunable source and synchronized OPA’s, we are aiming to elucidate interband and intraband dynamics in solids at the strong field regime. We want to develop sHHG as a solid-state spectroscopy tool capable of answering questions about ultrafast dynamics. On this front, we are interested in several classes of materials such as semiconductors, 2D materials and perovskites.

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