T. H. Salikhov, Yu. P. Khodjaev, A. Makhmalatif, D. M. Sharifov
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Theory of Second-Harmonic Generation of a Nonlinear Photoacoustic Response Of Two-Layer Samples With Gas–Microphone Signal Recording
We have formulated a mathematical model for a nonlinear photoacoustic (PA) response of two-layer samples. The features of second-harmonic (SH) generation of a nonlinear PA signal by these samples are studied in detail. Simple expressions for the amplitude of this signal, which describe its dependence on the modulation frequency of the incident beam, as well as on the thermal coefficients of thermophysical parameters and emissivity of the samples, are obtained for the most interesting cases. It was found that only for the case where the first layer is highly absorbing and both layers are thermally thick the frequency dependence of the SH amplitude of the PA signal has the form ω−5/2 and is described by the function ω−3/2 in all other cases. Only for nontransparent layers does the thermal coefficient of emissivity of the corresponding layer contribute to the amplitude of this signal.
期刊介绍：
Radiophysics and Quantum Electronics contains the most recent and best Russian research on topics such as:
Radio astronomy;
Plasma astrophysics;
Ionospheric, atmospheric and oceanic physics;
Radiowave propagation;
Quantum radiophysics;
Pphysics of oscillations and waves;
Physics of plasmas;
Statistical radiophysics;
Electrodynamics;
Vacuum and plasma electronics;
Acoustics;
Solid-state electronics.
Radiophysics and Quantum Electronics is a translation of the Russian journal Izvestiya VUZ. Radiofizika, published by the Radiophysical Research Institute and N.I. Lobachevsky State University at Nizhnii Novgorod, Russia. The Russian volume-year is published in English beginning in April.
All articles are peer-reviewed.
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