A solution growth system has been built based on temperature reduction method [1]. A few KDP crystals were grown by the system up to 160×40×38 mm dimensions. Spectrophotometer transmission spectra from (100) planes of the grown crystals show about 86 % transmission in the visible region. XRD analysis, laser damage threshold, and microhardness of the crystals were determined. The etching behavior of surface features of grown KDP single crystals was studied in different etchants.

A few KDP (KH 2 PO 4) and KDP: La 3+ (LaCl 3) single crystals were grown being based on the temperature reduction method. Investigations show that the presence of three valent ions like La 3+ could be a cause of retarded growth rate and induced crystalline lattice defects. Here the pure KDP crystals are compared with KDP: LaCl 3 before and after their exposure to gamma irradiation. Both types of crystals also were studied in aspect of other structural and optical properties.

Abstract. A few KDP (KH 2 PO 4 ) and KDP:Ca 2+ (CaCl 2 ) single crystals were grown based on the temperature reduction method. Investigations show that the presence of bivalent ions like Ca 2+ could be a cause of retarded growth rate and induced crystalline lattice defects. Here the pure KDP crystals are compared with KDP:CaCl 2 . Crystals of both types were also studied in aspect of other structural and optical properties.

KDP single and twin (prepared from two-glued seeds) crystals have been grown by the method of temperature reduction. Then, the grown crystals were cut and polished in the (100) direction for optical characterization. The transmission spectra and XRD analysis of the crystals were determined and compared. The Vickers microhardness tests carried out on the two types showed that duplication of the crystal lattice did not reduce the hardness of it.