Features like efficiency and stability of the double phase conjugate mirror
(DPCM) in BaTiO3 obviously depend on the beam fanning (BF) experienced by
each incident beam. We propose here a new approach to DPCM optimization whi
ch consists in studying the BF phenomenon for each interacting beam. This a
llows one to choose the best angular configuration of the incident beams in
DPCM. The investigation is experimental, by recording the fanning patterns
, and also theoretical, by interpreting numerically these patterns on the b
asis of the coupling gain maximization in the two-wave mixing theory. We fo
cus on the influence of the incident beam width and incidence angle. (C) 20
01 Elsevier Science B.V. All rights reserved.