Pump-probe photothermal lens experiment for measuring the thermal diffusivity coefficient of organic solvents

We report on a pump-probe photothermal lens experiment aimed for the measurement of thermal diffusivity coefficient of organic samples in the CW regime. We show that when the probe beam is collimated and the pump beam is focused the time dependence of the signal does not depend on the sample position. This effect allows simple determination of the thermal diffusivity coefficient and its effective calibration using reference samples. We use this method to determine the thermal diffusivity of distilled water, methanol, chloroform, nitrobenzene and other organic solvents.

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