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A: Fachverband Atomphysik
A 7: Attosecond physics
A 7.2: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
Signatures and Scaling of the Strong-Field Ionization Response in Low-Order Harmonic Generation — •Benjamin Liewehr1, Björn Kruse1, Christian Peltz1 und Thomas Fennel1,2 — 1Institute for Physics, University of Rostock, Albert-Einstein-Str. 23, D-18059, Rostock, Germany — 2Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, D-12489 Berlin, Germany
The notion of nonlinear response in dielectric solids has been successfully extended to the strong field ionization regime by linking high-order harmonic generation (HHG) to Bloch oscillations and interband recombination [1,2]. Recently, however, it was shown that these mechanisms cannot explain the emission of low harmonic orders which, instead, are generated by the strong field tunneling excitation that drives Brunel [3] and injection currents. While the tunneling injection current has been identified as the dominant mechanism close to the damage threshold [4], it is so far not known to which extent information about the transient excitation is imprinted on emitted low-order harmonics. Employing an ionization-radiation model, we examine the scaling behavior of ionization induced low-order harmonics and discuss mechanisim specific signatures for different polarization configurations.
[1] T. T. Luu, et al. Nature 521, 498 (2015)
[2] G. Vampa, et al. Nature 522, 462 (2015)
[3] F. Brunel, J. Opt. Soc. Am. B 4, 521 (1990)
[4] P. Jürgens, B. Liewehr, B. Kruse, et al. Nat. Phys. 16, 1035 (2020)