INVESTIGATION INTO SELF-PUMPED AND MUTUALLY PUMPED PHASE-CONJUGATION WITH BEAMS ENTERING THE NEGATIVE C-FACE OF DOPED (K0.5NA0.5)(0.2)(SR0.75BA0.25)(0.9)NB2O6 CRYSTALS

We investigated some novel geometries of self-pumped phase conjugation (SPPC) and mutually pumped phase conjugation (MPPC), relying on total internal reflection both from the a face and from corners, with beams entering the negative c face of doped (K0.5Na0.5)(0.2)(Sr0.75Ba0.25)( 0.9) Nb2O6 crystals. The different situations for internal light paths and their direct transformation at the same incident wavelength were observed. Similarities and differences between SPPC and MPPC are discu ssed. The dynamic features of SPPC and MPPC in different situations we re also observed. Three or more four-wave-mixing interaction regions' mere clearly observed inside the phase conjugators. influence on the r esponse rate and conjugation fidelity are analyzed. The large size of the samples necessary to ensure an optical path that is long enough fo r multistep bifurcation. The stability of the light channels is discus sed based on the fanning effect. (C) 1997 Optical Society of America.