The use of Cu-doped (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6 as self pumped phase conjugators with internal reflection is reported, The reflectivities as high as 63% at 514.5nm and 60% at 632.8nm were realized. It was found that the photorefractive response changes significantly at different dopping concentration. The responses of the crystals to the laser wavelength, incident angle and dopant concentration were studied.