Phase conjugation

Phase conjugation is a process where a wave, such as a light beam, is effectively reflected back with its properties reversed, as if it's a mirror image in time. Imagine a distorted wave traveling through a medium; phase conjugation creates a new wave that undoes those distortions, retracing the original path precisely. This technique is used to correct signal distortions, improve focus in imaging, and enhance communication systems by canceling out errors introduced by the environment, leading to clearer and more accurate wave propagation.