GROWTH AND PHOTOREFRACTIVE PROPERTIES OF MN-DOPED (KNA)(0.1)(SR0.6BA0.4)(0.9)NB2O6 CRYSTALS

(KNa)(0.1)(Sr0.6Ba0.4)(0.9)Nb2O6, or KNSBN, crystals have been grown w ith two different Mn concentrations: 0.02 wt% and 0.03 wt%. Two-wave m ixing and self-pumped phase conjugation experiments were carried out o n these crystals at 632.8 nm wavelength. The measured two-wave couplin g gains for the 0.02 wt% and 0.04 wt% crystals are larger than 7 cm(-1 ) and 9 cm(-1), respectively, and the two-wave coupling time response is faster for the 0.4 wt% crystal. In addition, the self-pumped phase conjugation reflectivity of the 0.04 wt% crystal is measured to be as high as 70%. It is shown that the Mn dopant can increase effectively t he absorption coefficient and enhance the photorefractive properties o f KNSBN. (C) 1996 American Institute of Physics.