Effects of Anionic Impurities on the Light Scatter in KDP Crystal

Potassium sulphate, potassium nitrate and potassium chloride were chosen as additives. KDP crystals were grown from the aqueous solution by the traditional temperature-lowering method and a point seed rapid method. Scatter particles are an important parameter to evaluate the properties of KDP crystals. Light scatter was detected with an ultramicroscopic method. The effects of SO42-, NO3-and Cl- ions on light scatter in the crystals were studied. Results show that SO42- ions have a little effect on the light scatter of KDP crystals and the scatter particles are in a low density. With the increase of the dopant concentration, the density of scatter particles increases a little. For KDP crystals grown by the traditional temperature-lowering method, the existence of NO3- and Cl- ions aggravates the light scatter in KDP crystals severely. The effect on the light scatter of KDP crystals grown by point seed rapid method is not evident.