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7LD-I-1
Interaction of strong optical fields with diamond - towards ultrafast control of electronic excitations
M. Kozák1
1Charles University- Faculty of Mathematics and Physics, Department of Chemical Physics and Optics, Prague, Czech Republic
Nonlinear interaction between few-cycle laser pulses with controlled carrier-envelope phase and solid-state materials allows to control the electron dynamics in matter on sub-femtosecond time scales. With increasing field amplitude of the driving light, the interaction changes from the classical perturbative regime to the non-perturbative, strong-field regime. In the latter, the electrons are excited by optical field-induced tunneling during a fraction of the optical cycle and further accelerated by the fields to high energies. The underlying electron dynamics can be studied using several observables as coherent high harmonic radiation, excited carrier population or transient changes of optical susceptibility.
In this contribution we discuss experimental observation and theoretical description of multiphoton absorption in diamond driven by few-cycle laser pulses and discuss its strong dependence on the polarization state of light [1]. We also experimentally demonstrate the dynamical Franz-Keldysh effect in diamond close to its direct band gap. Further, impact ionization of electrons in diamond driven by mid-infrared laser pulses is observed and studied in detail.
References
[1] M. Kozák, T. Otobe, M. Zukerstein, F. Trojánek, and P. Maly, „Anisotropy and polarization dependence of multiphoton charge carrier generation rate in diamond," Phys. Rev. B 99, 104305 (2019).
