J. Phys. IV France 125 (2005) 229-232
High-sensitivity absorption coefficients measurements using thermal lens spectrometryC. Jacinto and T. Catunda
Instituto de Física de São Carlos, Universidade de São Paulo - USP, CEP 13560 - 970, São Carlos, SP, Brazil
We report on measurements of absorption coefficients (Ae) with high-sensitivity (as small as 10-8 cm-1) in liquid and solid samples, using a simple pump-probe thermal lens experiment. Thermo-optical properties required for Ae determination, such as thermal conductivity K, thermal diffusivity D, and temperature coefficients of refractive index dn/dT and optical path length ds/dT, were also obtained. We measure an absorption coefficient at 457 nm of (5.3 ± 0.4)x10-3 cm-1 and at 514 nm of (2.50 ± 0.05)x10-4 cm-1 for undoped silica glass and Ethylene Glycol, respectively.
© EDP Sciences 2005