The Mn doped potassium sodium strontium barium niobate crystals are grown

poled and polished and their two wave coupling

two wave coupling time response and self pumped phase conjugation at 632 8 nm are studied in the experiment. The two wave coupling gain are larger than 7 cm -1 and 9 cm -1 for 0 02% and 0 04% samples respectively and the two wave coupling time response of 0 04% sample is four times faster than that of 0 02% sample. Self-pumped phase conjugate reflectivity of 0 04% sample is as high as 70%. It is shown that Mn doipants can effectively increase absorption coefficient and enhance photorefractive properties of potassium soduim strontium barium niobate crystals at red wavelength.