Abstract

A recently developed dual-beam configuration that optimizes the thermal lens technique has been used to obtain the absorption spectrum of pure water from 350to528nm. Our results indicate the minimum linear absorption coefficient smaller than 2×105cm1 between 360 and 400nm. This value is lower than previous literature data, and it is blueshifted. Absorption coefficients as small as 2×107cm1 can be measured for water using 1W of excitation power. A detection limit of 6×109cm1 (P=1W) for CCl4 was estimated, which represents, to the best of our knowledge, the highest sensitivity obtained in small absorption measurements in liquids.

© 2009 Optical Society of America

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