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Thermal parameters of solids determination by the photodeflection method - theories and experiment comparison

Dorota Korte-Kobylińska D., Bukowski R.J., Bodzenta J., Kochowski S.

Optica Applicata

2008

Vol. 38, nr 2

445-458

This paper is concerned with the application of complex geometrical optics equations to sample thermal parameters determination by the photodeflection method. The thermal diffusivity of a sample is determined using the four parameters least-squares-fitting of theoretical dependence of normal photodeflection signal on angular modulation frequency to the experimental data. The calculation of the signal on the basis of complex geometrical optics is proved to be more accurate approach of determining the sample thermal diffusivity than that based on the geometrical and wave optics.

Deflective signal analysis in photothermal measurements in the frame of complex geometrical optics

Bukowski R. J., Korte D.

Optica Applicata

2005

Vol. 35, nr 1

77-97

The influence of one dimensional plane thermal wave on probing Gaussian beams phase and deflection by complex geometrical optics methods has been analyzed in the work. The probing beam detection by quadrant photodiode has been investigated. The dependence of photodiode current signal on the probing beam diameter, its waist, sample position, angular modulation frequency and the height of the beam over the sample has been studied.