Nonlinear distortion of intense THz beams

Cs Lombosi, Gy Polónyi, M. Mechler, Z. Ollmann, J. Hebling, J. Fülöp

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Near- and far-field beam profiles were measured for THz pulses generated in LiNbO3 by optical rectification of 200 fs pulses with a tilted pulse front. The variation of the THz beam size and a dramatically increasing divergence angle with increasing pump fluence were observed in the (horizontal) plane of the pulse front tilt. No significant variation was observed in the vertical direction. The reason for the observed nonlinear beam distortion is the shortening of the effective interaction length for THz generation caused by the combined effect of pump spectral broadening and angular dispersion in the tilted pulse front geometry. Our results indicate that nonlinear THz beam distortion effects have to be taken into account when designing intense THz sources and related experiments.

Original languageEnglish
Article number083041
JournalNew Journal of Physics
Volume17
Issue number8
DOIs
Publication statusPublished - Aug 19 2015

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pulses
pumps
rectification
far fields
near fields
divergence
fluence
profiles
geometry
interactions

Keywords

  • lithium niobate
  • nonlinear optics
  • optical rectification
  • terahertz pulses
  • tilted-pulse-front pumping

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nonlinear distortion of intense THz beams. / Lombosi, Cs; Polónyi, Gy; Mechler, M.; Ollmann, Z.; Hebling, J.; Fülöp, J.

In: New Journal of Physics, Vol. 17, No. 8, 083041, 19.08.2015.

Research output: Contribution to journalArticle

Lombosi, Cs ; Polónyi, Gy ; Mechler, M. ; Ollmann, Z. ; Hebling, J. ; Fülöp, J. / Nonlinear distortion of intense THz beams. In: New Journal of Physics. 2015 ; Vol. 17, No. 8.
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