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Definition of "optical phase conjugation" |
an optical process in which a time reversed replica of the incident wave is generated. The time-reversed replica is identical to the incident wave, except the direction of propagation. Optical phase conjugation can be achieved by using a deformable mirror whose mirror surface matches exactly thewavefront of the incident wave. For example, consider the reflection of a sphericalwave from a spherical mirror with an identical radius of curvature. The reflected wave is a time-reversed replica of the incident wave. Optical phase conjugation can also be obtained by using optical four-wave mixing, stimulated Brillouin scattering (SBS) in nonlinear media. In optical phase conjugation via four-wave mixing, the nonlinear medium is pumped by a pair of counter propagating beams. When a signal beam is incident into the medium, a phase conjugate beam is generated which is a time-reversed replica of the incident beam. |
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