Remote mid-infrared photoacoustic spectroscopy with a quantum cascade laser

Thomas Berer, Markus Brandstetter, Armin Hochreiner, Gregor Langer, Wolfgang Märzinger, Peter Burgholzer, Bernhard Lendl

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We demonstrate non-contact remote photoacoustic spectroscopy in the mid-infrared region. A room-temperatureoperated pulsed external-cavity quantum cascade laser is used to excite photoacoustic waves within a semitransparent sample. The ultrasonic waves are detected remotely on the opposite side of the sample using a fiber-optic Mach- Zehnder interferometer, thereby avoiding problems associated with acoustic attenuation in air. We present the theoretical background of the proposed technique and demonstrate measurements on a thin polystyrene film. The obtained absorption spectrum in the region of 1030-1230 cm-1 is compared to a spectrum obtained by attenuated total reflection, showing reasonable agreement.

Original languageEnglish
Pages (from-to)3476-3479
Number of pages4
JournalOptics Letters
Volume40
Issue number15
DOIs
Publication statusPublished - Jul 2015

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