Indirect absorption spectroscopy using quantum cascade lasers: mid-infrared refractometry and photothermal spectroscopy | Zendy

Marcel Pfeifer | Zendy; A. Ruf | Zendy; Peer Fischer | Zendy

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Indirect absorption spectroscopy using quantum cascade lasers: mid-infrared refractometry and photothermal spectroscopy

Author(s) -

Marcel Pfeifer,

A. Ruf,

Peer Fischer

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.025643

Subject(s) - photothermal spectroscopy , refractometry , optics , spectroscopy , materials science , refractive index , quantum cascade laser , photothermal therapy , infrared spectroscopy , laser , absorption (acoustics) , absorption spectroscopy , infrared , total internal reflection , optoelectronics , chemistry , physics , organic chemistry , quantum mechanics

We record vibrational spectra with two indirect schemes that depend on the real part of the index of refraction: mid-infrared refractometry and photothermal spectroscopy. In the former, a quantum cascade laser (QCL) spot is imaged to determine the angles of total internal reflection, which yields the absorption line via a beam profile analysis. In the photothermal measurements, a tunable QCL excites vibrational resonances of a molecular monolayer, which heats the surrounding medium and changes its refractive index. This is observed with a probe laser in the visible. Sub-monolayer sensitivities are demonstrated.

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