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 . Our results indicate the minimum linear absorption coefficient smaller than between 360 and . This value is lower than previous literature data, and it is blueshifted. Absorption coefficients as small as can be measured for water using of excitation power. A detection limit of for 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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