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

Krzysztof Iwaszczuk, David Cooke, Masazumi Fujiwara, Hideki Hashimoto, Peter Uhd Jepsen

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    Abstract

    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.
    Original languageEnglish
    JournalOptics Express
    Volume17
    Issue number24
    Pages (from-to)21969-21976
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-17-24-21969. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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