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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21969–21976

Simultaneous reference and differential waveform acquisition in time-resolved terahertz spectroscopy

Krzysztof Iwaszczuk, David G. Cooke, Masazumi Fujiwara, Hideki Hashimoto, and Peter Uhd Jepsen  »View Author Affiliations

Optics Express, Vol. 17, Issue 24, pp. 21969-21976 (2009)

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We present a new method for data acquisition in time-resolved terahertz spectroscopy experiments. Our approach is based on simultaneous collection of reference and differential THz scans. Both the optical THz generation beam and the pump beam are modulated at two different frequencies that are not harmonic with respect to each other. Our method allows not only twice as fast data acquisition but also minimization of noise connected to slowly varying laser power fluctuations and timing instabilities. Our use of the nonlinear crystal N-benzyl-2-methyl-4-nitroaniline (BNA) enables time-resolved THz spectroscopy to beyond 5 THz, thereby highlighting that the presented method is especially valuable at higher frequencies where phase errors in the data acquisition become increasingly important.

© 2009 Optical Society of America

OCIS Codes
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: October 14, 2009
Revised Manuscript: November 13, 2009
Manuscript Accepted: November 13, 2009
Published: November 16, 2009

Krzysztof Iwaszczuk, David G. Cooke, Masazumi Fujiwara, Hideki Hashimoto, and Peter Uhd Jepsen, "Simultaneous reference and differential waveform acquisition in time-resolved terahertz spectroscopy," Opt. Express 17, 21969-21976 (2009)

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