Abstract
A theoretical study of parametric excitation of phonons involving impurities in cubic crystals with NaCl structures is presented. The proposed excitation mechanism which takes place via nonlinear processes involving localized modes is analogous to the first-order Suhl instability in ferromagnetic insulators. Sufficient excitation of impurity lattice vibration by infrared absorption can result in a sudden avalanche of optical and acoustic phonons due to anharmonic interaction. It is shown that the critical power of the laser source necessary to attain the instability threshold is experimentally feasible.
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