PYN-PLZT陶瓷光学特性及温度对其发光特性的影响

发布时间：2018-05-04 08:03

本文选题：PYN-PLZT陶瓷 + 温度效应　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：PYN-PLZT电光陶瓷材料由PYN与PLZT混合烧制而成,在保证材料透明度的情况下提高了Yb3+离子的浓度。高浓度的Yb3+离子使其在发光材料方面表现出较大潜力。Yb3+离子只存在两个4f能级使得材料不会受到诸如浓度猝灭等情况的影响。同时Yb3+离子较长的能级寿命能够极大的满足高能激光器的需求,这也推动了近年来Yb3+离子增益介质的发展。Yb3+离子的准三能级结构使得材料的性能随外界温度的变化而变化。针对这一问题,本课题对PYN-PLZT陶瓷发光特性随温度的变化进行探究,目的为寻求不同温度下合适工作波长的激光器和放大器提供指导作用,并为提高Yb3+离子掺杂材料性能提供方向。为了了解PYN-PLZT材料在开发多功能光源(激光器与光学放大器)的潜能,我们研究了材料相关的光学、电学、热学与发光特性,也探讨了温度变化的相关影响。课题首先对材料的基本性能进行研究,完成了PYN-PLZT材料透射谱的测量,确定了材料的通光范围和通光能力;随后对材料的介电温谱进行测量,得到材料的介电常数和居里温度;最后测量了材料的二次电光系数及其随温度的变化,对材料的温度稳定性进行了分析。材料在所关注的波段通光良好,适于作为发光基质材料。宽广的介电温谱使得相关的多功能电路温度控制显著放松。在较宽的温度范围内的优良的二次电光系数可以显著降低控制电压。在对PYN-PLZT陶瓷材料相关光谱的测试中,完成了对材料的拉曼光谱测量,了解了材料内部晶格振动能级情况。这对认识该材料作为发光基质的热学特性至关重要。吸收谱的测量帮助我们确定合适的泵浦光波长。为了充分了解其作为发光材料的潜能,我们还利用扩展的J-O理论计算了材料的受激发射截面等相关发光参数随温度的变化,对材料发光特性随温度的变化进行了理论分析。为了认识该材料开发光源的适用波段与温度特性,我们对材料发光光谱随温度的变化进行了测量,直接研究材料发光特性与材料温度之间的关系,并利用系统能级理论计算了材料准三能级系统性能随温度的变化,与实验结果相结合讨论了材料发光特性随温度的变化及其原因。确定了开发光源的最佳波段,以及不同波段适合的工作温度。
[Abstract]:The PYN-PLZT electrooptic ceramic material is made of PYN and PLZT, which increases the concentration of Yb3 ion under the condition of ensuring the transparency of the material. The high concentration of Yb3 ion makes it show great potential in luminescent material. Yb3 ion only has two 4f energy levels so that the material will not be affected by such conditions as concentration quenching. At the same time, the longer energy level lifetime of Yb3 ion can greatly meet the needs of high-energy lasers, which also promotes the development of Yb3 ion gain medium in recent years. The quasi-three-level structure of Yb3 ion makes the material performance change with the change of external temperature. To solve this problem, this paper explores the variation of luminescence characteristics of PYN-PLZT ceramics with temperature, in order to provide guidance for laser and amplifier with suitable operating wavelength at different temperatures. It also provides the direction for improving the properties of Yb3 ion doped materials. In order to understand the potential of PYN-PLZT materials in the development of multifunctional light sources (lasers and optical amplifiers), we have studied the optical, electrical, thermal and luminescent properties of materials, and discussed the effects of temperature changes. Firstly, the basic properties of the material are studied, the transmission spectrum of PYN-PLZT material is measured, and the range and ability of transmitting light are determined, then the dielectric constant and Curie temperature of the material are obtained by measuring the dielectric temperature spectrum of the material. Finally, the secondary electro-optic coefficient and its variation with temperature are measured, and the temperature stability of the material is analyzed. The material has a good light flux in the band concerned and is suitable as a luminous substrate. The wide dielectric temperature spectrum significantly relaxes the temperature control of the related multifunctional circuits. The high secondary electro-optic coefficient in a wide temperature range can significantly reduce the control voltage. In the measurement of the correlation spectra of PYN-PLZT ceramic materials, the Raman spectra of the materials were measured, and the vibrational energy levels of the lattice in the materials were investigated. This is important to understand the thermal properties of the material as a luminescent substrate. The measurement of absorption spectra helps us determine the appropriate pump wavelength. In order to fully understand its potential as a luminescent material, we also use the extended J-O theory to calculate the dependence of temperature on the luminescence parameters such as the excited emission cross section of the material, and analyze the luminescence characteristics of the material with temperature. In order to understand the suitable band and temperature characteristics of the light source developed by the material, we have measured the luminescence spectrum of the material with the change of temperature, and studied directly the relationship between the luminescence characteristic of the material and the temperature of the material. Based on the system energy level theory, the temperature dependence of material quasi-three-level system performance is calculated, and the variation of material luminescence characteristics with temperature and its reasons are discussed in combination with the experimental results. The optimum band of light source and the suitable operating temperature of different band are determined.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.1

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