Interferometric method for the observation in real time of some infrared photothermal effects

We present a numerical study of the behavior of the signal in a photothermal experiment combining the mirage effect and a Jamin interferometer. Our analysis is limited to a square-pulse excitation by a weakly absorbed Gaussian pump laser beam with a large radius. We investigate the influence of three parameters: the time of illumination of the sample, the time of extinction of the pump beam, and the height of the probe-beam arm of the Jamin interferometer above the sample. We show that the path difference, which induces the variation of intensity at the output of the Jamin interferometer, is caused by both probe-beam deflection and temperature variation of the refractive index of air above the sample. The first effect is dominant for short times, and interferometry is a sensitive tool to monitor it.

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Interferometric method for the observation in real time of some infrared photothermal effects

Cited by 3 publications

References 9 publications

Interferometric method for the observation of infrared photothermal effects

Interferometric method for the observation of infrared photothermal effects

A study of the photothermal effect induced by an ir laser impulse

Photothermal measurements with a Jamin interferometer

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