Abstract
The Brillouin-enhanced four-wave mixing (BEFWM) technique for phase conjugation in high-power laser systems is presented. The technique represents a form of nearly degenerate four-wave mixing in which the four beams are coupled acoustically through Brillouin nonlinearity. Emphasis is placed on the case of the Brillouin geometry where the second pump beam is downshifted by the acoustic frequency from the first pump. A 1D steady-state model has been developed which takes into account the limitation of the reflectivity of the BEFWM process due to the presence of a small component of the second pump beam with the same polarization as the first pump beam. In addition, 3D wave optics code have been developed for calculating the conjugation fidelity under less than ideal conditions such as misalignment of the pump beams, the two pump beams not being perfect conjugates of each other, etc.
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