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Moscow University Physics Bulletin

, Volume 74, Issue 2, pp 155–159 | Cite as

The Focal Length Effect on Energy Absorption and Terahertz Generation upon Focusing Two-Color Radiation in Air

  • D. V. Pushkarev
  • A. A. Ushakov
  • E. V. Mitina
  • N. A. Panov
  • D. S. Uryupina
  • D. E. Shipilo
  • R. V. Volkov
  • P. A. Chizhov
  • A. P. Shkurinov
  • O. G. Kosareva
  • A. B. Savel’evEmail author
Optics and Spectroscopy. Laser Physics

Abstract

Generation of terahertz radiation upon filamentation in air of two-color radiation in loose focusing conditions with focal lengths from 30 to 312 cm and a beam diameter of 0.8 cm was studied. Two-color radiation was generated in a nonlinear BBO crystal irradiated by a converging laser beam. Measurements show that the energy input into the medium increases dramatically with a decrease in the focal length to 50 cm or less; at F = 30 cm, the energy of a terahertz pulse linearly depends on the laser pulse energy and increases significantly at F = 50 cm. Terahertz radiation is still not observed at longer focal lengths, which is apparently due to a spatio—temporal mismatch of the radiation of the first and second harmonics.

Keywords

femtosecond filamentation terahertz radiation energy input two-color radiation numerical aperture 

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Notes

Acknowledgments

D.V. Pushkarev thanks the “BASIS” foundation for the financial support.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • D. V. Pushkarev
    • 1
  • A. A. Ushakov
    • 1
    • 2
  • E. V. Mitina
    • 1
  • N. A. Panov
    • 1
    • 3
  • D. S. Uryupina
    • 1
  • D. E. Shipilo
    • 1
  • R. V. Volkov
    • 1
  • P. A. Chizhov
    • 2
  • A. P. Shkurinov
    • 1
    • 3
  • O. G. Kosareva
    • 1
    • 3
  • A. B. Savel’ev
    • 1
    • 3
    Email author
  1. 1.Department of PhysicsMoscow State UniversityMoscowRussia
  2. 2.Prokhorov General Physics InstituteRussian Academy of SciencesMoscowRussia
  3. 3.International Laser CenterMoscow State UniversityMoscowRussia

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