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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 2 — Jan. 19, 2009
  • pp: 592–597

Tuning and focusing THz pulses by shaping the pump laser beam profile in a nonlinear crystal

Ciro D’Amico, Marc Tondusson, Jérome Degert, and Eric Freysz  »View Author Affiliations

Optics Express, Vol. 17, Issue 2, pp. 592-597 (2009)

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Spatially shaped femtosecond laser pulses are used to generate and to focus tunable terahertz (THz) pulses by Optical Rectification in a Zinc Telluride (ZnTe) crystal. It is shown analytically and experimentally that the focusing position and spectrum of the emitted THz pulse can be changed, in the intermediate field zone, by controlling the spatial shape of the near-infrared (NIR) femtosecond (fs) laser pump. In particular, if the pump consists of concentric circles, the emitted THz radiation is confined around the propagation axis, producing a THz pulse train, and focusing position and spectrum can be controlled by changing the number of circles and their diameter.

© 2009 Optical Society of America

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.5540) Ultrafast optics : Pulse shaping

ToC Category:
Ultrafast Optics

Original Manuscript: November 3, 2008
Revised Manuscript: December 3, 2008
Manuscript Accepted: December 5, 2008
Published: January 7, 2009

Ciro D'Amico, Marc Tondusson, Jérome Degert, and Eric Freysz, "Tuning and focusing THz pulses by shaping the pump laser beam profile in a nonlinear crystal," Opt. Express 17, 592-597 (2009)

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