DCTA对KDP晶体的快速生长与光学性能的影响

Effect of DCTA on the Rapid Growth and Optical Characterization of KDP Crystal

环己二胺四乙酸（DCTA）作为一种新型添加剂被加入到KDP晶体生长溶液中。采用“点籽晶，，-决速生长技术，在掺杂100×10-6 DCTA的饱和溶液中，生长了KDP晶体，生长速度达20mm／d。研究了这种新型添加剂DCTA对快速生长的KDP晶体的生长习性和光学质量的影响，并与常用添加剂EDTA的影响效果进行了对比。研究发现，在KDP晶体生长溶液中添加100×10-6 DCTA使生长溶液的亚稳区宽度提高了约10℃，晶体（100）面的生长速度提高了3～10倍；生长出的晶体在紫外波段的透过率上升了2～8倍，晶体内部的光散射大大减轻，激光损伤阈值也有所提高。添加剂DCTA对KDP晶体生长及性能的改善作用比同等浓度的EDTA更加显著。

Cyclohexanediaminetetraacetic acid （DCTA） as a new additive was added into the KDP growth solution. The KDP crystal was grown from aqueous solution with 100×10-6 DCTA by the ＂point seed＂ rapid growth technique, at growth rate of about 20 mm/d. Effects of the new additive DCTA on growth habit and optical quality of the rapidly grown KDP crystal were investigated and compared with those of EDTA which was a common additive used in the rapid growth of KDP crystal. With 100×10-6 DCTA added in growth solution, the metastable temperature zone width of solution increased about 10℃ and the growth rate of （100） faces of KDP crystal accelerated by 3-10 times. Further- more, the optical quality of crystal doped with DCTA was improved significantly： such as 2-8 times rise of UV trans- mittance, great mitigation of light scattering and a few exaltation of laser damage threshold. Additionally, the benefi- cial effects of DCTA on growth habit and optical quality of the rapidly grown KDP crystal were more significant than those of EDTA with the same concentration.