Precision optical measurements and metrology

Accuracy and applicability of the standardized methods of processing the temperature data in laser and piezoelectric laser calorimetry

K. V. Zotov^a, A. Yu. Ostapiv^a, N. V. Tereshchenko^a, O. A. Ryabushkin<sup>b

a</sup> Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Russia
^b Kotelnikov Institute of Radioengineering and Electronics, Fryazino Branch, Russian Academy of Sciences

Abstract: Analytical expressions for the correction factors allowing to account for the finite thermal conductivity in the measuring optical absorption coeffcieint by laser calorimetry (LC) and piezoelectric resonance laser calorimetry (PRLC) methods were obtained. It was proven that the PRLC method compared to the LC method is far more resistant to the effects of the finite thermal conductivity of the sample. In practice, the main sources of error in measuring the absorption coefficient by the PRLC method turn out to be variations of the ambient temperature and of the heat transfer conditions. Modifications of the standardized methods are proposed that allows to partially account for the non-ideal experimental conditions. The correction factors that were obtained may broaden the scope of the PRLC and LC methods to the large samples or to the ones having the low heat conductivity.

Keywords: optical absorption, laser calorimetry, heat equation, piezoelectric laser calorimerty, piezoelectric resonance.

Received: 03.10.2024
Revised: 03.10.2024
Accepted: 14.11.2024

DOI: 10.61011/OS.2025.01.59882.7073-24

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