CLBO晶体潮解机理研究

发布时间：2018-06-07 19:11

  本文选题：非线性光学晶体 + CLBO　； 参考：《东南大学》2015年硕士论文

【摘要】：无机非线性(Nonlinear Optical,简称NLO)光学晶体材料能够扩展现有激光器的输出频率,在光通讯、信号传输等领域得到广泛的应用。硼酸锂铯(CsLiB6O10,简称CLBO)晶体作为非线性光学晶体,具有非线性系数大、双折射适中、离散角小、激光损伤阈值高、接收角范围和温度带宽,且易生长大尺寸高质量的单晶等优点,在1064nm激光器的四倍频和五倍频应用方面表现出了卓越的性能。然而,CLBO晶体易潮解的问题极大地限制了其应用。本文针对晶体的潮解问题,研究了CLBO晶体稳定生长的条件,通过改善晶体的生长条件来减少缺陷,提高晶体的质量；探讨了CLBO晶体的潮解机理以及提高晶体抗潮解能力的有效途径。主要工作如下：采用水溶液法合成CLBO粉料的手段,获得了分散均匀的CLBO原料,这一方法降低了CLBO的熔料温度,消除了配料过程中的原料挥发损失。采用顶部籽晶法生长CLBO单晶体,并且改变籽晶的形状,采用尖端籽晶降低了晶体生长过程中缺陷产生的概率,提高CLBO晶体的质量,生长出了大尺寸高质量的CLBO单晶体。设计水溶液与CLBO晶体粉末在不同温度条件下的反应,并通过XRD和TG两种分析手段对反应产物进行分析,发现其潮解反应产物为α-CsB5O6(OH)4(H2O)2、 β-CsB5O6(OH)4(H2O)2并且潮解产物的组分随反应温度变化而变化。通过对CLBO晶体进行渗氢处理,提高晶体的抗潮解能力。实验发现,经过渗氢处理的晶体透过率下降了近10%,紫外吸收边蓝移了1nm,晶体的机械性能有所增强,具体表现为硬度和模量的增加,同时晶体的二倍频转换效率明显提高,抗潮解能力有所增强。这主要与氢气在400-℃的条件下与晶体发生一系列的反应有关,改变了晶体的微观结构,从而使晶体的性能得以改善。
[Abstract]:Inorganic nonlinear optical (NLOO) optical crystal materials can extend the output frequency of existing lasers and are widely used in the fields of optical communication and signal transmission. As a nonlinear optical crystal, CsLiB6O10 crystal has many advantages, such as large nonlinear coefficient, moderate birefringence, small dispersion angle, high laser damage threshold, wide range of receiving angle and temperature bandwidth, and easy to grow large size and high quality single crystal. It has shown excellent performance in the application of 1064nm laser in four times frequency and five times frequency. However, its application is greatly limited by the problem of easy moisture solution of CLBO crystal. In this paper, the conditions for the stable growth of CLBO crystals are studied in order to reduce the defects and improve the quality of the crystals by improving the growth conditions of the CLBO crystals. The mechanism of moisture degradation of CLBO crystal and the effective way to improve the ability of moisture resistance of CLBO crystal are discussed. The main work is as follows: the CLBO powder was synthesized by aqueous solution method, and the uniformly dispersed CLBO material was obtained, which reduced the melting temperature of CLBO and eliminated the loss of raw material volatilization in the process of mixing. CLBO single crystal was grown by top seed method and the shape of seed was changed. The probability of defects in crystal growth was reduced and the quality of CLBO crystal was improved by using tip seed crystal. The large size and high quality single crystal of CLBO was grown. The reaction of aqueous solution with CLBO crystal powder at different temperatures was designed. The products were analyzed by XRD and TG. It was found that the products of the reaction were 伪 -CsB 5O 6, 尾 -CsB 5O 6, OHN 4H 2O 2, 尾 -CsB 5O 6, O H 2O 4 H 2O 2 and the composition of the hydrolysates varied with the reaction temperature. The moisture resistance of CLBO crystal was improved by hydrogen permeation treatment. The experimental results show that the transmission rate of the crystal treated by hydrogen permeation has decreased by nearly 10%, the ultraviolet absorption edge has shifted blue by 1 nm, the mechanical properties of the crystal have been enhanced, the hardness and modulus of the crystal have been increased, and the conversion efficiency of the double frequency conversion of the crystal has been improved obviously. The ability to resist moisture has been improved. This is mainly related to a series of reactions between hydrogen and the crystal at 400 鈩，

本文编号：1992464