共查询到19条相似文献,搜索用时 171 毫秒
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利用X射线衍射和显微激光拉曼光谱研究熔盐法自发结晶的KTP晶体、顶部籽晶熔盐法KTP晶体和水热法KTP晶体的晶胞参数和拉曼光谱特征,分析和比较不同方法生长的KTP晶体的晶体结构与化学键特征峰.研究表明:KTP晶体的晶胞参数与晶体生长方法有关,熔盐法自发结晶的KTP晶体生长过程中降温速率较快,晶胞体积相对较小;熔盐法和水热法KTP晶体中部分拉曼特征峰的位置因生长方法不同呈现一定的差异,水热法KTP晶体在782 cm-1、744 cm-1和515 cm-1处出现的特征峰可视为水热法KTP晶体的标志峰,借此可将其与熔盐法晶体相区分. 相似文献
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通过研究晶体生长工艺参数对Nb∶KTiOPO4(Nb∶KTP)晶体生长的影响,用熔盐顶部籽晶法获得尺寸为55mm×25mm×5mm的Nb∶KTP透明单晶.研究中发现熔体的温度梯度、籽晶和降温速率将严重影响Nb∶KTP晶体的生长.Nb离子的引入不利于Nb∶KTP晶体的生长,尤其是造成晶体易开裂,且沿a轴方向生长速度非常缓慢.同时,Nb的引入大大改变Nb∶KTP晶体的倍频性能.掺杂Nb浓度的摩尔分数为13;时,Nb∶KTP晶体的倍频的Ⅱ型相位匹配的截止波长缩短至937nm,且有效产生469nm倍频蓝光;掺杂Nb浓度的摩尔分数为3;时,Nb∶KTP晶体对Nd∶YAG的1.0642μm激光倍频的最佳相位匹配角为θ=88.32°,()=0°,非常接近90°非临界相位匹配方向. 相似文献
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Nb:KTiOPO4晶体的生长和倍频性能 总被引:3,自引:0,他引:3
通过研究晶体生长工艺参数对Nb∶KTiOPO4(Nb∶KTP)晶体生长的影响,用熔盐顶部籽晶法获得尺寸为55mm×25mm×5mm的Nb∶KTP透明单晶.研究中发现熔体的温度梯度、籽晶和降温速率将严重影响Nb∶KTP晶体的生长.Nb离子的引入不利于Nb∶KTP晶体的生长,尤其是造成晶体易开裂,且沿a轴方向生长速度非常缓慢.同时,Nb的引入大大改变Nb∶KTP晶体的倍频性能.掺杂Nb浓度的摩尔分数为13%时,Nb∶KTP晶体的倍频的Ⅱ型相位匹配的截止波长缩短至937nm,且有效产生469nm倍频蓝光;掺杂Nb浓度的摩尔分数为3%时,Nb∶KTP晶体对Nd∶YAG的1.0642μm激光倍频的最佳相位匹配角为θ=88.32°,()=0°,非常接近90°非临界相位匹配方向. 相似文献
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KTP晶体的电光研究进展 总被引:11,自引:6,他引:5
本文简述了KTP晶体的电光性能并与KD*P、LN晶体进行了比较。概括了KTP晶体电光器件研究的主要进展。对水热法生长的KTP晶体和熔剂法生长的KTP晶体在电光应用中的优缺点进行了分析。最后介绍了熔剂法生长的低电导率KTP晶体在电光领域的应用研究。 相似文献
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Tianye Lu Zhanggui Hu Xiaomao Li Yinchao Yue Xuesong Yu Zhenxiong Wu 《Crystal Research and Technology》2012,47(8):882-887
Using the solution‐reacted materials, potassium titanyl phosphate (KTiOPO4, KTP) crystal was grown by the top‐seeded solution growth (TSSG) method. The solution‐reacted precursor was characterized by scanning electron microscope, and the solubility of KTP in K8P6O19 was measured. The crystals were investigated by synchrotron radiation X‐ray topography, scattering centers measurement, weak absorption test and damage threshold test. The results showed that dispersion was better and solubility was higher than those by solid‐reacted method. Compared with the conventional crystal, KTP crystal grown from the solution‐reacted precursor had fewer defects, fewer scattering centers, lower weak absorption and higher damage threshold. 相似文献
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Gallium orthophosphate (GaPO4) single crystals were grown by the reverse temperature gradient method from phosphoric acid solutions under hydrothermal conditions. Twins after (110) were studied by etching faces having been cut perpendicular to one of the twofold axes. Based on the determination of the twin boundary position as well as on the knowledge of the growth rates of different crystallographic forms, a few faces have been chosen to be quite promising for growing high‐quality GaPO4 single crystals if they are offered at the referring seed crystal. From the characterization of the grown crystals conditions have been found, which may lead to the reduction of the inversion twin number during the growth process. 相似文献
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E. I. Orlova N. E. Novikova A. Gagor I. A. Verin A. Pietraszko D. A. Belov V. I. Voronkova 《Crystallography Reports》2010,55(4):594-601
A series of potassium titanyl phosphate single crystals doped with zinc (KTP: Zn) is grown by spontaneous flux crystallization.
Their properties and the way the additive is implanted in the crystal lattice are studied. The inclusion of zinc atoms in
the KTP structure is evidenced by the data of chemical analysis and the results of studies of electrophysical properties (the
growth of conductivity and increase of relaxation anomalies). Precision X-ray diffraction studies of KTP: Zn single crystals
reveal changes in the channel of the structure which correlate with the physical properties of this crystal series. No substitution
of zinc atoms for titanium, phosphorus, or potassium atoms is found in the structure. Zinc atoms can be located at structural
defects, domain walls, and the crystal surface. 相似文献
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Jiyang Wang Jinggian Wei Yaogan Liu Xin Yin Xiaobo Hu Zongsu Shao Minhua Jiang 《Progress in Crystal Growth and Characterization of Materials》2000,40(1-4):3-15
This paper reviews the growth and properties of KTiOPOP4 (KTP) and its analogue crystals including its isomorphous crystals and doped crystals. Based on the calculation of the refractive indices and phase matching of KTP crystals, it is shown that non-critical phase matching can be achieved theoretically. In a 4%Nb-doped KTP crystal, non-critical phase matching was obtained with a pulsed Nd:YAG laser in an efficiency of ca. 4%. Most of the isomorphous and doped KTP crystals possess similar physical, optical and nonlinear optical properties as those of KTP.RbTiOPO4, KTiOASO4 and RbTiOASO4 crystals have better electrooptical figure of merit and RbTiOPO4 crystals have a fast ion conductor character. Some doped KTP crystals have shown high second harmonic generation efficiencies and damage thresholds. But the homogeneity of KTP analogue crystals is poorer than that of KTP. On the base of damage threshold tests using a CW Argon laser, it is concluded that the best second harmonic generation crystal among all the KTP analogue crystals is still KTP itself. Special care must be taken to eliminate impurity centers to avoid the formation of gray track and photorefractive centers. 相似文献
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Wang Jiyang Liu Yaogang Wei Jingqian Jiang Minghua Shao Zongshu Liu Wenjun Jiang Shusheng 《Crystal Research and Technology》1997,32(2):319-327
A series of niobium doped KTP (Nb: KTP) crystals has been grown. XRD and DTA experiments show that the Nb: KTP crystal structures do not differ from that of KTP (within experimental error) and that the melting points of the crystals increase with increasing Nb content. Synchrotron radiation topography revealed that the main defects of the crystals were growth sector boundaries, growth striations, inclusions and dislocations. Second harmonic generation experiments were performed using a 12.2% Nb:KTP and the d15 and d24 values of csystal were determined to be (3.7 ± 0.4) and (8.3 ± 0.8) × 10−9 esu, respectively. The relationship between phase-matching angle and Nb content for a 1.064 μm laser was determined and in the case of a 4.0% Nb:KTP crystal, non-critical phase matching was realized. 相似文献
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Zhong De‐Gao Teng Bing Yu Zheng‐He He Lin‐Xiang Wang Shu‐Hua Jiang Xue‐Jun Ma Jiang‐Tao Zhuang Shu‐Jie Huang Wan‐Xia 《Crystal Research and Technology》2012,47(10):1083-1087
Potassium dihydrogen phosphate (KDP) crystals were restrained to grow in two dimensions only, using a specially designed platform. This enables us to grow the blanks of frequency conversion elements that satisfy type‐II phase matching direction out of a type‐II phase‐matched seed crystal. Synchrotron radiation topography was used to study the growth mechanism of these profiling grown KDP crystals. It is found that both dislocation growth mechanism and layer growth mechanism were involved in the growing process. Inclusions, growth striations and dislocations were the main defects that influenced the crystalline quality of these crystals. High‐resolution X‐ray diffraction was employed to study the lattice integrality of the crystal. 相似文献