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Ｎｂ：ＫＴＰ晶体（简称ＫＴＮＰ），为一种新型蓝光倍频晶体，在激光频率转换、光学数据存储和医疗诊断等方面具有广阔的应用前景［１］。本文以ＫＨ２ＰＯ４，Ｋ２ＨＰＯ４·３ＨＯ２，ＴｉＯ２和Ｎｂ２Ｏ５（光谱纯）为起始原料，采用高温溶液顶部籽晶缓冷法生长了ＫＴＮＰ晶体。原料中的铌含量用Ｎｂ５＋与Ｔｉ４＋的摩尔百分比来表示。所生长的ＫＴＮＰ晶体为无色透明片状晶体，当原料中的铌含量较大时，晶体略呈淡黄色。与纯ＫＴＰ晶体相比，ＫＴＮＰ晶体无论在生长、形态和缺陷方面，还是在结构和性能方面，都表现出一定的差异，值得深入研究。尤其是该晶体的生长形态和缺陷发生了很大的变化，给其应用带来了较大的困难。因此，对ＫＴＮＰ晶体的生长形态和缺陷的研究具有更加重要的实用价值。１ＫＴＮＰ晶体生长形态的研究ＫＴＮＰ晶体与纯ＫＴＰ晶体相似，都是有六个四种类型的单形：［１００］、［０１１］、［２０１］、［０１１］和［１１０］聚合而成［２］。其晶体外形如图１所示。但是，与纯ＫＴＰ不同的是，ＫＴＮＰ晶体沿［１００］方向的生长极为缓慢，从而形成该方向较薄的片状外形。由于ＫＴＮＰ晶体的主要应用为直接产生蓝光和９０℃非临界位相匹配，都需要［１００］方向较厚的晶?
Nb: KTP crystal (referred to as KTNP) is a new type of blue-light doubling crystal, which has broad application prospects in laser frequency conversion, optical data storage and medical diagnosis [1]. In this paper, KH2PO4, K2HPO4 · 3HO2, TiO2 and Nb2O5 (pure spectrum) as the starting material, high temperature solution top seedling KTNP crystal growth. The niobium content in the feedstock is expressed as the molar percentage of Nb5 + to Ti4 +. The growth of KTNP crystal colorless transparent crystal plate, when the niobium content of raw materials larger, the crystal slightly pale yellow. Compared with pure KTP crystal, KTNP crystal shows some differences in terms of growth, morphology and defects, as well as its structure and properties, which deserves further study. In particular, the crystal growth morphology and defects have undergone great changes, bringing great difficulties to its application. Therefore, the study on the growth morphology and defects of KTNP crystals has more important practical value. 1 KTNP Crystal Growth KTNP crystals are similar to pure KTP crystals in that there are six types of singletons: [100], [011], [201], [011] and [110] ]. The crystal shape shown in Figure 1. However, unlike pure KTP, KTNP crystals grow very slowly in the [100] direction, resulting in a thinner profile in this direction. Since the main application of KTNP crystals is the direct generation of blue light and noncritical phase matching at 90 ° C, thicker crystals in the [100] direction are required.