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Differential Thermal Lensing in Extended Samples

Volume 57, Number 10 (Oct. 2003) Page 1278-1281

Marcano O., A.; Hung, J.; Rodríguez, L.; Borrero, L.


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.