Abstract

A single-beam photothermal-lensing technique to study interfaces is presented. By analysis of the reflection from a quartz–solution interface with a low-power laser in a single-beam configuration, a photothermal signal is detected. The data were fitted with a conventional thermal lens model, and the results show that the optical element formed at the interface resembles an inverted thermal lens.

© 1999 Optical Society of America

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