Differential Thermal Lensing in Extended Samples

Abstract:

We present a new scheme for a pump-probe mode-mismatched thermal lensing experiment aimed at extracting the value of low-absorbing components in the presence of a high-absorbing background. The method allows for the use of large path-length samples. Changes in the background absorption of a column of ethanol of 20 cm of 1 % and a pollutant concentration detection limit of 0.04 ppm are obtained when using a pump light power of 34 mW.

Año de publicación:

2003

Keywords:

• Thermal lens
• absorption
• Z-scan

Fuente:

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scopus