本文選題：非線性光學(xué)晶體 + CLBO�。� 參考：《東南大學(xué)》2015年碩士論文

【摘要】：無機非線性(Nonlinear Optical,簡稱NLO)光學(xué)晶體材料能夠擴展現(xiàn)有激光器的輸出頻率,在光通訊、信號傳輸?shù)阮I(lǐng)域得到廣泛的應(yīng)用。硼酸鋰銫(CsLiB6O10,簡稱CLBO)晶體作為非線性光學(xué)晶體,具有非線性系數(shù)大、雙折射適中、離散角小、激光損傷閾值高、接收角范圍和溫度帶寬,且易生長大尺寸高質(zhì)量的單晶等優(yōu)點,在1064nm激光器的四倍頻和五倍頻應(yīng)用方面表現(xiàn)出了卓越的性能。然而,CLBO晶體易潮解的問題極大地限制了其應(yīng)用。本文針對晶體的潮解問題,研究了CLBO晶體穩(wěn)定生長的條件,通過改善晶體的生長條件來減少缺陷,提高晶體的質(zhì)量；探討了CLBO晶體的潮解機理以及提高晶體抗潮解能力的有效途徑。主要工作如下：采用水溶液法合成CLBO粉料的手段,獲得了分散均勻的CLBO原料,這一方法降低了CLBO的熔料溫度,消除了配料過程中的原料揮發(fā)損失。采用頂部籽晶法生長CLBO單晶體,并且改變籽晶的形狀,采用尖端籽晶降低了晶體生長過程中缺陷產(chǎn)生的概率,提高CLBO晶體的質(zhì)量,生長出了大尺寸高質(zhì)量的CLBO單晶體。設(shè)計水溶液與CLBO晶體粉末在不同溫度條件下的反應(yīng),并通過XRD和TG兩種分析手段對反應(yīng)產(chǎn)物進行分析,發(fā)現(xiàn)其潮解反應(yīng)產(chǎn)物為α-CsB5O6(OH)4(H2O)2、 β-CsB5O6(OH)4(H2O)2并且潮解產(chǎn)物的組分隨反應(yīng)溫度變化而變化。通過對CLBO晶體進行滲氫處理,提高晶體的抗潮解能力。實驗發(fā)現(xiàn),經(jīng)過滲氫處理的晶體透過率下降了近10%,紫外吸收邊藍移了1nm,晶體的機械性能有所增強,具體表現(xiàn)為硬度和模量的增加,同時晶體的二倍頻轉(zhuǎn)換效率明顯提高,抗潮解能力有所增強。這主要與氫氣在400-℃的條件下與晶體發(fā)生一系列的反應(yīng)有關(guān),改變了晶體的微觀結(jié)構(gòu),從而使晶體的性能得以改善。
[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 偽 -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，

本文編號：1992464