"Phase conjugate mirrors are capable of producing a time-reversed (TR) wave in direct response to a received ordinary wave. The mirror may be powerfully "pumped" with energy to produce a very large amplification of the time-reversed wave." [Bearden] https://billstclair.com/www.cheniere.org/books/excalibur/part4.htm
See Also
conjugate
Conjugate Variables
corner reflectors of radar
phase conjugate replica wave
phase conjugate gradient wave
phase conjugation
self-conjugate
phase conjugate
Scalar