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Subcycle dynamics of electron–hole pairs and high-harmonic generation in bulk diamond subjected to intense femtosecond laser pulse

  • Tzveta Apostolova
  • Boyan Obreshkov
Article
  • 54 Downloads
Part of the following topical collections:
  1. Focus on Optics and Bio-photonics, Photonica 2017

Abstract

We present calculation of photoexcitation and high-harmonic generation in bulk diamond induced by intense near-infrared laser pulse of photon energy 1.55 eV, time duration of 15 fs and peak field strength \(F= 0.4\) V/Å. Depending on the laser polarization direction, the pulsed irradiation creates electron–hole pairs and transient density fluctuations in a localized region of the crystal momentum space. As a consequence energetic inter- and intra-band harmonics are generated with alternating phase during each half-cycle of the driving pulse. The corresponding inter- and intra-band currents are in definite phase relation with the laser pulse, reflecting the build-up of coherent superposition of population between valence and conduction bands, and the accelerated motion of charge carriers in their respective bands.

Keywords

Ultrafast laser pulse High harmonic generation Wide bandgap dielectric Diamond 

Notes

Acknowledgements

This work is supported by the Bulgarian National Science Fund under Contracts No. DFNI-E02/6, No. DNTS/FRANCE-01/9, No. DN-18/ 7 and No. DN-18/11 (T.A.) and by the Bulgarian National Science Fund under Contract No. 08-17 (B.O.).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute for Nuclear Research and Nuclear EnergyBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Institute for Advanced Physical StudiesNew Bulgarian UniversitySofiaBulgaria

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