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
Marcos Gugliotti, Mauricio S. Baptista, Luís G. Dias, and Mario J. Politi, "Single-Beam Interface Thermal Lensing," Appl. Opt. 38, 1213-1215 (1999)