共查询到20条相似文献,搜索用时 46 毫秒
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利用传统的融熔-淬冷技术制备了70GeS2-15Ga2S3-15Ag2S硫系玻璃,并通过析晶处理成功地制得了含优异非线性光学晶体AgGaGeS4的硫系微晶玻璃。线性光学性能和维氏硬度研究表明该材料适于作为中红外光学材料应用。麦克条纹测试(Maker fringe)表明该微晶玻璃有着良好的二阶非线性光学性能。该硫系微晶玻璃是一种新型的中红外光学频率变换用候选材料。 相似文献
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以BaCO3、H3BO3为原料,经高温熔触及控制热处理,获得了BaO·B2O3透明玻璃陶瓷.利用XRD、SEM等手段研究了该材料的结构特征及表面形貌.结果表明,在玻璃表面得到了含有单一β-BaB2O4(BBO)晶相结构的析晶薄膜层,薄膜表面均匀,单股厚度约2μm,晶粒平均尺寸约0.2μm,且微晶粒沿a轴方向优先生长;析晶优先从玻璃表面开始向内部进行,形成晶化层—玻璃—晶化层的三元“夹心”结构.该玻璃陶瓷具有良好的光学性能,在1.064μm调QNd:YAG强激光作用下观察到了样品倍频信号的产生(SHG). 相似文献
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分析了锗酸盐微品玻璃表面析晶过程中离子的运动与迁移方式,对长时间晶化后微晶玻璃中形成的孔洞和气孔的成因进行了分析.认为锗酸盐微晶玻璃中孔洞的形成是由于在表面析晶过程中,随晶化时间的延长,内部离子不断向表面迁移,以致在内部出现离子耗空层,最终形成孔洞.而析晶过程中玻璃中气孔的不断长大是由于气孔等缺陷部位本身能量较高,在晶化过程中离子将优先从气孔位置不断迁移至表面析晶层,所以在析晶过程中气孔将不断扩大. 相似文献
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Pure and 7% MgO-doped lithium niobate (LiNbO3) single crystals were grown by the Czochralski technique. The shift of optical absorption edge in 7% MgO-doped crystal in direction of shorter wavelength compared to undoped crystal was observed. The second harmonic generation measurements of 7% MgO-doped LiNbO3 crystal were performed at room temperature by means of the rotational Maker fringe technique using Nd:YAG laser generating at 1064 nm in picoseconds regime. Experimentally obtained value of nonlinear optical coefficient d33 for 7% MgO-doped LiNbO3 was found to be less than for undoped crystal but higher than for 5% MgO-doped. I-type phase-matched second harmonic generation was achieved and the value of phase-matched angle was calculated. High quadratic nonlinearity together with tolerance to intensive laser irradiation makes 7% MgO-doped LiNbO3 crystal interesting for application in optoelectronics. 相似文献
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二阶非线性光学玻璃的研究在现代信息技术的发展中占有重要地位 ,己成为光电子技术领域中最尖端的课题之一。本文重点评述了近年来国内外在二阶非线性光学玻璃领域的研究进展 ,分别从各种玻璃系统中诱导二次谐波发生 (SHG)的激光诱导极化、电场 /温度场极化和电子束辐射极化等方法。讨论了SHG的理论模型和实验研究。最后展望了未来二阶非线性光学玻璃的研究方向和应用前景。 相似文献
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Deming Tan Benjamin Kirbus Michael Rüsing Tobias Pietsch Michael Ruck Lukas M. Eng 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(23)
Optically nonlinear Pb2B5O9X (X = Cl, Br) borate halides are an important group of materials for second harmonic generation (SHG). Additionally, they also possess excellent photocatalytic activity and stability in the process of dechlorination of chlorophenols, which are typical persistent organic pollutants. It would be of great interest to conduct in situ (photo‐) catalysis investigations during the whole photocatalytic process by SHG when considering them as photocatalytic materials. In order to get superior photocatalytic efficiency and maximum surface information, small particles are highly desired. Here, a low‐cost and fast synthesis route that allows growing microcrystalline optically nonlinear Pb2B5O9X borate halides at large quantities is introduced. When applying the ionothermal growth process at temperatures between 130 and 170 °C, microcrystallites with an average size of about 1 µm precipitate with an orthorhombic hilgardite‐like borate halide structure. Thorough examinations using powder X‐ray diffraction and scanning electron microscopy, the Pb2B5O9X microcrystals are indicated to be chemically pure and single‐phased. Besides, the Pb2B5O9X borate halides' SHG efficiencies are confirmed using confocal SHG microscopy. The low‐temperature synthesis route thus makes these borate halides a highly desirable material for surface studies such as monitoring chemical reactions with picosecond time resolution and in situ (photo‐) catalysis investigations. 相似文献
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生物活性陶瓷活动义眼座的研制及动物实验研究 总被引:3,自引:0,他引:3
用含有氧氟磷灰石和硅灰石微晶的生物活性陶瓷制成了用于义眼镶配的可活动的义眼座,其物理性能一物相容性优良。用DTA、XRD、SEM及EDS方法分析了其结构,动物实验结果表明,其活动性令人满意。 相似文献
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稀土掺杂上转换发光玻璃陶瓷的制备及性能 总被引:1,自引:0,他引:1
实验制备了一类含有SrF2∶Yb3+,Tm3+及SrF2∶Yb3+,Er3+的透明发光玻璃和玻璃陶瓷,对比研究了热处理工艺对玻璃陶瓷相组成、微观结构和光谱性能的影响规律。研究表明,玻璃陶瓷具有立方SrF2纳米晶相均匀分布于玻璃基体的复相结构,利用HRTEM可观测到SrF2纳米晶相的(111)晶面,其晶粒尺度在10~30nm之间,且该析晶相中富集有Yb3+/Tm3+和Yb3+/Er3+。基于此,玻璃陶瓷在980nm LD激光激发下的上转换发光强度较玻璃样品有较大提高。其上转换发光机制分别主要为Yb3+-Yb3+之间的合作上转换,Yb3+-Tm3+和Tm3+-Tm3+之间的交叉弛豫能量传递过程,以及Yb3+-Er3+之间的能量传递上转换。 相似文献
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In order to investigate the influence of different heavy metal ions on the formation of the oxyfluoride glasses and glass ceramics, samples with different Pb F2/Cd F2 ratios have been prepared by the melting quenching and thermal treatment method. The different effects of Pb2 tand Cd2ton the glass network structure are investigated by FTIR and Raman spectra. During the formation of glass network structure, Pb2 tprefers to break the Sie Oe Si bond and subsequently bond to F for charge compensation, and Cd2 tprefers to break the SieO eA l bond and is surrounded by O2. Pb2 tand F gather together and form the fluoride nanocrystals,while Cd2 tremains in oxide matrix after thermal treatment. Introduction of proper Cd F2 is important to adjust and control the glass network structure and crystallization process in the fabrication of the transparent glass ceramics. 相似文献
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采用高温熔融法制备了Bi2O3-SiO2玻璃及玻璃陶瓷, 测试了样品的近红外光区及可见光区的发射谱、激发谱及荧光寿命。在808 nm波长光的激发下, Bi2O3-SiO2玻璃及玻璃陶瓷中均发现了近红外发光。当Bi2O3含量较低时(30mol%、40mol%、50mol%), 发光中心位于1336 nm(或1300 nm), 为宽带发光; 随Bi2O3含量的增加, 1070 nm左右出现了窄带近红外发光峰, 且逐渐成为最强发光峰, 与此同时, 1336 nm(或1300 nm)的宽带发光转变为窄带发光。1336 nm (或1300 nm)与1070 nm发射峰的荧光寿命及激发谱均存在较大的区别, 初步分析认为这两个发射峰归属于不同的发光中心, 1336 nm(或1300 nm)发射峰源于低价态Bi离子。 相似文献