Abstract
The occurrence of optical phase conjugation via stimulated Brillouin scattering (OPC-SBS) in bulk semiconducting crystals under the off-resonant transition regime has been investigated theoretically, the crystal being immersed in a large magnetostatic field. The model is based upon the coupled-mode approach and incorporates the effect of pump absorption through the first-order (i.e., linear) induced polarization. The linear dispersion is found not to affect the reflectivity of the phase-conjugate Stokes-shifted Brillouin mode. The reflectivity of the image radiation is dependent upon the Brillouin susceptibility and can be significantly enhanced through n-type doping of the crystal and the simultaneous application of a large magnetostatic field. Moreover, the threshold of the pump intensity required for the occurrence of SBS in the crystal with finite optical attenuation can be considerably diminished through a suitable choice of the excess carrier concentration and the magnetic field. Consequently, OPC-SBS becomes a possible tool in phase-conjugate optics even under not-too-high-power laser excitation by using moderately doped n-type semiconductors kept under the influence of large magnetostatic field. Numerical estimates made for InSb crystal at 77 K duly irradiated by nanosecond pulsed 10.6-\ensuremath{\mu}m ${\mathrm{CO}}_{2}$ laser show that high OPC-SBS reflectivity can be achieved at pump intensities below the optical damage threshold if the crystal is used as an optical waveguide with relatively large interaction length (L\ensuremath{\sim}3 mm).
Published Version
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