Title: Absorption coefficient of nearly transparent liquids measured using thermal lens spectrometry
Author(s):

	H.Cabrera (Centro de Física, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Apartado 21827, Venezuela; Instituto de Ciencia y Tecnología de Materiales (ICTM), U.H, CP 10400, Ciudad Habana, Cuba) ,
	A.Marcano (Centro de Física, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Apartado 21827, Venezuela) ,
	Y.Castellanos (Universidad Central de Venezuela, Apartado Postal 20513, Caracas 1020 A, Venezuela)

We use an optimized pump-probe mode-mismatched thermal lens scheme to determine the optical absorption coefficient and thermal diffusivity of ethanol, benzene, acetone, methanol, toluene and chloroform. In this scheme the excitation beam is focused in the presence of a collimated probe beam. The agreement between experimentally obtained results and values reported in the literature is good.

Key words: thermal lens, absorption coefficient, transparent liquids, thermal diffusivity
PACS: 78.20.Nv, 78.20.Ci, 42.25.Bs, 42.62.Fi

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