T. Berer, M. Brandstetter, A. Hochreiner, G. Langer, W. Märzinger, P. Burgholzer, B. Lendl:
"Remote mid-infrared photoacoustic spectroscopy with a quantum cascade laser";
Optics Letters, 40 (2015), 15; S. 3476 - 3479.

Kurzfassung englisch:
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.

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