Abstract
The phase of electromagnetic wave in a deformable medium will be altered by applying mechanical disturbance. The relative phase change caused by static strain has been studied in the earlier paper by the authors. Adopting the similar procedure of derivation from deformable electrodynamic theory, we develop the case for dynamic perturbed strain in this paper. Phase change of electromagnetic wave, which is derived based on two different approaches, such as deformable electrodynamic theory and photoelastic theory, is calculated and compared to each other. Due to the dynamic nature of perturbed strain it is necessary to make some extension for both approaches, The linearizations of electromagnetic-mechanical equations and the relationships between electrostriction constants and elasto-optical coefficients are also needed for the comparison. It is worth to emphasize that the relative phase change, which has been expressed by three empirical formulas for different frequency range of mechanical disturbance by other investigators, is represented by a uniform formulation developed in this paper for various frequency range of mechanical disturbance.
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