Time-resolved, photothermal-deflection spectrometry with step optical excitation: experiments

摘要

Recently a theoretical model for time-resolved photothermal-deflection spectrometry with step optical excitation was proposed on the basis of one-dimensional heat conduction treatment. We have experimentally investigated this technique. A fully automated experimental apparatus was built, and a least-squares curve-fitting process was developed to fit the time-resolved experimental data to the theoretical model. Consequently, thermal conductivity along the direction perpendicular to the sample surface and unit volume specific heat could be precisely determined simultaneously, even for highly anisotropic samples. Meanwhile for a transparent sample, the optical absorption coefficient could be also measured. The experimental results are in good agreement with literature values. (c) 2005 Optical Society of America.