不同生长方式和籽晶切向KDP晶体的生长及性能

磷酸二氢钾(KDP)晶体是一种经典的电光材料,是目前唯一可用于惯性约束核聚变的非线性光学材料。鉴于籽晶和生长方法对KDP晶体的生长和质量具有重要的影响,本文采用传统法生长法和点籽晶快速生长法生长KDP晶体,通过改变籽晶的种类及切向,不仅减少了晶体的恢复区,同时缩短了晶体的生长周期,生长出高透明度的单晶。对晶体的透过、结晶完整性及损伤等性能进行测试,结果表明,晶体在红外和可见光波段具有较高的透过率;晶体(001)面的衍射强度较强,峰形比较尖锐;相比于1-on-1方式,R-on-1处理使KDP的损伤阈值提高了1.7～2.1倍,晶体的抗损伤均匀性很高。生长的晶体具有优良的光学性能,籽晶对晶体的生长具有重要的影响。

Growth and performance of KDP crystals grown from different methods and seeds

Potassium dihydrogen phosphate (KDP) crystal is a classic electro-optical material and is the only nolinear optical material used in the Inertial Confinement Fusion (ICF) program. The growth method and seed have significant influence to the quality of KDP crystal. In this paper, KDP crystals were grown by conventional method and point seed rapid growth method, by changing directions of seeds, the regeneration sector and growth period were decreased and the grown crystals were high transparent and have no visible defect. Optical transmittance measuring performance, crystalline perfection and laser damage threshold were measured, the result showed that the grown crystals have excellent optical performance and seeds have significant effect on the growth and quality of KDP crystal.