Advertisement

Observation of forward propagating THz mode emitted from a two-color laser-induced air plasma

  • P. Klarskov
  • P. Uhd Jepsen
Article

Knowledge about the spatial properties of the optical beam is important for most free-space optical experiments including THz spectroscopy and imaging. THz generation from a two-color laser-induced air plasma is a new, but already well-described technique for generation of broadband THz light [1, 2]. However, the spatial properties of the THz beam emitted from the plasma have not until recently been investigated in detail [3, 4]. Off-axis conical THz emission has both been predicted theoretically [5, 6] and demonstrated experimentally [3, 4, 5, 6, 7], but also an on-axis forward propagating component of the THz emission has been suggested [4, 6]. In this letter we report an experimental observation of this weak forward propagating THz mode by spatially eliminating the much stronger off-axis conical THz emission. The characteristics of this additional THz beam component emitted from the plasma are important for the understanding of the ultrafast dynamics in the plasma, as well as in a...

Keywords

Intensity Image Vertical Projection Conical Emission Effective Focal Length Borate Crystal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    D. Cook and R. Hochstrasser, "Intense terahertz pulses by four-wave rectification in air," Opt. Lett. 25, 1210–1212 (2000).CrossRefGoogle Scholar
  2. 2.
    H. G. Roskos, M. D. Thomson, M. Kreß, and T. Löffler, "Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications," Laser Photon. Rev. 1, 349–368 (2007).CrossRefGoogle Scholar
  3. 3.
    P. Klarskov, A. C. Strikwerda, K. Iwaszczuk, and P. U. Jepsen, "Experimental three-dimensional beam profiling and modeling of a terahertz beam generated from a two-color air plasma," New J. Phys. 15, 075012 (2013).CrossRefGoogle Scholar
  4. 4.
    V. Blank, M. D. Thomson, and H. G. Roskos, "Spatio-spectral characteristics of ultra-broadband THz emission from two-colour photoexcited gas plasmas and their impact for nonlinear spectroscopy," New J. Phys. 15, 075023 (2013).CrossRefGoogle Scholar
  5. 5.
    H. Zhong, N. Karpowicz, and X.-C. Zhang, "Terahertz emission profile from laser-induced air plasma," Appl. Phys. Lett. 88, 261103 (2006).CrossRefGoogle Scholar
  6. 6.
    Y. You, T. Oh, and K. Kim, "Off-Axis Phase-Matched Terahertz Emission from Two-Color Laser-Induced Plasma Filaments," Phys. Rev. Lett. 109, 183902 (2012).CrossRefGoogle Scholar
  7. 7.
    A. V. Borodin, M. N. Esaulkov, I. I. Kuritsyn, I. A. Kotelnikov, and A. P. Shkurinov, "On the role of photoionization in generation of terahertz radiation in the plasma of optical breakdown," J. Opt. Soc. Am. B 29, 1911–1919 (2012).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.DTU Fotonik—Department of Photonics EngineeringTechnical University of DenmarkKgs. LyngbyDenmark

Personalised recommendations