Abstract

In this paper we address the phenomena of four-wave mixing and stimulated Brillouin scattering (SBS) in a medium containing free electric charges. Under SBS the hypersonic wave at the frequency of the Stokes shift Ω [1] gives rise to oscillation of the all particles of the medium near their equilibrium positions. In an electrically neutral medium equilibrium quantities of the positive and negative charged particles per unit volume are the same. However their mobilities are slightly different. Therefore, the magnitudes and phases of their oscillations near equilibrium positions are not equal to one another. This results in transient electric charge separation in acoustic field [2]. That is, under SBS the excitation of hypersonic wave in the medium with free electric charges leads to the generation of the electric charge density wave of the same frequency in the medium [3].

© 1996 Optical Society of America