Study on the Growth and Quality of Potassium Dihydrogen Phosphate Grown from Acid-doped Solution

摘要

Potassium dihydrogen phosphate (KDP) single crystals have been grown respecti- vely at the rates of about 1 and 20 mm/day from the pure and acid-added solutions by temperature reduction method. The effects of acid and supersaturation on the shape and size of grown crystals were compared and discussed. Samples were cut from different parts of the as-grown crystals for investigating the optical quality, including transmissibility, scattering centers and laser damage threshold. It is found that the stability of KDP growth solution improves to some extent and the growth rates in x- and z-directions have great difference after adding acid. Moreover, the acid causes remarkable differences in optical quality between prismatic and pyramidal sectors.