Acoustic resonance laser calorimetry for measurements of low optical absorption

A novel method of acoustic resonance laser calorimetry (ARLC) for the determination of low optical absorption coefficients of crystals and glasses is introduced. It is based on measurements of the kinetics of the equivalent temperature of the sample irradiated by the pulse laser radiation. The equiv...

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Bibliographic Details
Published in:Applied optics (2004) 2020-10, Vol.59 (28), p.8733
Main Authors: Konyashkin, Aleksey V., Molkov, Aleksey A., Ryabushkin, Oleg A.
Format: Article
Language:English
Subjects:
Absorptivity
Acoustic absorption
Acoustic resonance
Acoustics
Equivalence
Heat measurement
KDP crystals
Kinetics
Lasers
Potassium phosphates
Pulse repetition rate
Temperature probes
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Summary:A novel method of acoustic resonance laser calorimetry (ARLC) for the determination of low optical absorption coefficients of crystals and glasses is introduced. It is based on measurements of the kinetics of the equivalent temperature of the sample irradiated by the pulse laser radiation. The equivalent temperature of the sample is directly obtained by measuring the frequency changes of its temperature-calibrated acoustic resonances excited by the laser radiation with a corresponding pulse repetition rate. In contrast to the conventional resonant photoacoustic spectroscopy, where the resonance is used for the enhancement of the registered signal, in ARLC, the laser-excited acoustic resonance of the sample acts as a high-sensitivity temperature probe for measurements of its heating kinetics. The ARLC approach was verified by measuring the optical absorption coefficient of the potassium dihydrogen phosphate crystal ( α = 4.2 ⋅ 1 0 − 2 c m − 1 ) at 1064 nm wavelength.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.403164