Ilhem Soyah

University of Sousse, Tunisia

Time investigation and enhancement of the photothermal lens effect in the modematched configuration

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Biography

Abstract

The geometrical configuration of the dual-beam photothermal lens (PTL) experiment has a major role in the PTL sensitivity. This work examines the mode-matched configuration in terms of temporal evolution of PTL signal amplitude. The main results concern the improvement of the PTL signal under specific conditions with the mode-matched arrangement considered in several previous works as less sensitive, but less influenced by the aberration effects. The amplitude of the obtained PTL signal is considerably increased to be of the same order of magnitude as that given by the modemismatched configuration. This has occurred by reducing the probe beam waist at the sample to probe a part of temperature gradient area having a photothermal thin lens behavior. Another important result concerns the application of the PTL experiment for the quantification of permanganate as a high absorbing medium. The measured PTL signal obtained with the mode-matched configuration becomes more important and increases linearly with the increase of permanganate concentration contrary to the mismatched configuration where the PTL signal reaches a limit value.