Michelson interferometer


Two-beam nterference
Phase conjugation.

Look for reference:
N.G.Basov,I.G.Zubarev,A.B.Mironov,S.I.Michailov,A.Yu.Okulov
"Laser interferometer with wavefront reversing mirrors ", Sov.Phys.JETP,v.52(5),p.847(1980).