点籽晶降温法快速生长大尺寸磷酸二氢钾晶体
Rapid growth of large size KDP crystal by temperature reduction method
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摘要: 大尺寸磷酸二氢钾(KDP)晶体在惯性约束聚变系统中主要用于制作变频及开关光学元件。在传统生长技术基础上，开展了点籽晶降温法大尺寸KDP晶体的快速生长技术研究，设计制作大型培养槽及载晶架，采用过热注种方式试验点籽晶生长，培育出尺寸50 cm×50 cm×41 cm的KDP大单晶，其（100）面生长速度稳定为15 mm/d。晶体在300~1 100 nm波段的透过光谱与常规生长的等同，影响晶体生长及光学品质的主要的金属杂质离子Fe3+，Cr3+，Al3+等含量少于10-6，晶体激光损伤基频阈值30 J/cm2，三倍频阈值达到8.6 J/cm2。Abstract: Potassium dihydrogen phosphate (KDP) and its deuterated analog are the crystals primarily selected for Pockel’s cells or frequency conversion plates in inertial confinement fusion systems. Crystals rapidly grown from point seed by temperature reduction method are presented. The growth of large size crystals including the designation of big vessel, crystal holder and seed-planting under over-heating systems are introduced. Crystals with size up to 50 cm×50 cm×41 cm were obtained successfully. It is shown that crystals grown at rapid growth rate,15 mm/day the average, possess the optimal transmission properties as those grown by conventional method. The content of impurity ions, such as Fe3+, Cr3+, Al3+ that affect the prismatic faces of KDP are determined
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Key words:
- kdp crystal /
- transmittance spectra /
- laser-induced damage /
- rapid growth /
- temperature reduction method
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