DCTA对KDP晶体的快速生长与光学性能的影响

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”快速生长技术, 在掺杂100×10^-6 DCTA的饱和溶液中, 生长了KDP晶体, 生长速度达20 mm/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。

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

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. Furthermore, the optical quality of crystal doped with DCTA was improved significantly: such as 2–8 times rise of UV transmittance, great mitigation of light scattering and a few exaltation of laser damage threshold. Additionally, the beneficial 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.