Abstract
Pump-probe thermal lensing (TL) is a well known method for the measurement of small absorption coefficient with high sensitivity and versatility. When measuring the absorption of a complex system such as a solution composed by a high absorbing solvent and a low absorbing solute, the contribution of the solute is usually masked by the absorption of the solvent. To overcome the background contribution differential methods have been proposed [1]. However, these methods involved the focusing of the pump and probe beams onto the sample cell and independently onto the reference cell. Because of that these methods are only effective for short path-length samples. In this communication we present a new scheme for a pump-probe mode-mismatched TL experiment where the probe beam is focused in the presence of a nearly collimated pump beam. The scheme substantially simplifies the realization of a differential TL experiment allowing for the use of large path-length samples.
© 2003 Optical Society of America
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