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Photonics Dictionary

nonlinear optical phase conjugation

The coupling of laser or light beams via nonlinear optical techniques such as four-wave mixing to achieve spatial variation of the electrical field of the target beam. This technique is also referred to as time reversal, or wavefront reversal in which the phase conjugation results in the reverse propagation direction and phase variation of the incident beam of light. This reversed beam is called the conjugate beam.
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