Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

Temperature calibrated piezoelectric resonances of internal acoustic vibration modes of a nonlinear-optical crystal during its heating by high-power laser radiation are used for noncontact measurements of both the non-uniform temperature distribution in the crystal volume and in the surrounding air....

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Veröffentlicht in:Journal of the European Optical Society. Rapid publications 2011, Vol.6, p.11032
Hauptverfasser: Ryabushkin, O. A., Myasnikov, D. V., Konyashkin, A. V., Tyrtyshnyy, V. A.
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Sprache:eng
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Zusammenfassung:Temperature calibrated piezoelectric resonances of internal acoustic vibration modes of a nonlinear-optical crystal during its heating by high-power laser radiation are used for noncontact measurements of both the non-uniform temperature distribution in the crystal volume and in the surrounding air. A novel notion of equivalent temperature of a crystal heated by laser radiation is introduced in laser physics. The true non-uniform crystal thermodynamic temperature at a given laser power is substituted by the measured equivalent crystal temperature, which is constant at that laser power. Using appropriate laser heating model the measured value of the equivalent crystal temperature allows one to calculate the unknown linear and nonlinear optical absorption coefficients as well as the heat transfer coefficient of the crystal with the surrounding air.
ISSN:1990-2573
1990-2573
DOI:10.2971/jeos.2011.11032