Abstract

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 ($\alpha = {4.2}\cdot{{1}}{{{0}}^{- 2}}\;{\rm{c}}{{\rm{m}}^{- 1}}$) at 1064 nm wavelength.

© 2020 Optical Society of America

Precise measurements of the low optical absorption coefficients of massive lithium triborate crystal boules with untreated facets formed during the growth process

Georgii A. Aloyan, Dmitriy A. Denisov, Ivan V. Grishchenko, Aleksey V. Konyashkin, and Oleg A. Ryabushkin
Appl. Opt. 61(36) 10802-10806 (2022)

Measurement of Very Low Absorption Coefficients by Laser Calorimetry

Marvin Hass, James W. Davisson, Herbert B. Rosenstock, and Julius Babiskin
Appl. Opt. 14(5) 1128-1130 (1975)

RF oscillator circuit for absorption coefficient measurement of piezoelectric materials

K. V. Zotov, I. V. Grischenko, A. V. Konyashkin, and O. A. Ryabushkin
Appl. Opt. 62(15) 4047-4051 (2023)

Accurate measurements of longitudinal temperature distribution of PPLN crystal in the process of second-harmonic generation

Grigorii Yu. Ivanov, Pavel S. Cherpak, Aleksey V. Konyashkin, and Oleg A. Ryabushkin
Appl. Opt. 59(24) 7330-7337 (2020)

Combined laser calorimetry and photothermal technique for absorption measurement of optical coatings

Bincheng Li, Holger Blaschke, and Detlev Ristau
Appl. Opt. 45(23) 5827-5831 (2006)