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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9251–9257

Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna

M. Beck, H. Schäfer, G. Klatt, J. Demsar, S. Winnerl, M. Helm, and T. Dekorsy  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9251-9257 (2010)

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We report on the generation of impulsive terahertz (THz) radiation with 36 kV/cm vacuum electric field (1.5 mW average thermal power) at 250 kHz repetition rate and a high NIR-to-THz conversion efficiency of 2 × 10-3. This is achieved by photoexciting biased large-area photoconductive emitter with NIR fs pulses of μJ pulse energy. We demonstrate focussing of the THz beam by tailoring the pulse front of the exciting laser beam without any focussing element for the THz beam. A high dynamic range of 104 signal-to-noise is obtained with an amplifier based system.

© 2010 Optical Society of America

OCIS Codes
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Ultrafast Optics

Original Manuscript: March 8, 2010
Revised Manuscript: April 8, 2010
Manuscript Accepted: April 8, 2010
Published: April 19, 2010

M. Beck, H. Schäfer, G. Klatt, J. Demsar, S. Winnerl, M. Helm, and T. Dekorsy, "Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna," Opt. Express 18, 9251-9257 (2010)

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