https://scholars.lib.ntu.edu.tw/handle/123456789/64949
標題: | 可視化水平區融法生長非線性光學晶體之應用研究(2/2) | 作者: | 藍崇文 | 關鍵字: | 凹凸生長界面;沈入式加熱器;可視化水平區熔系統;溢流現象 | 公開日期: | 31-十月-2005 | 出版社: | 臺北市:國立臺灣大學化學工程學系暨研究所 | 摘要: | 鈮酸鋰(LiNbO3)在光學工業應用上是一種重要的材料。典型上,鈮酸鋰是由共熔組成 所生長,也就是Li/Nb= 48.4/51.6 ,而其中由於包含了大的鋰缺陷,因而導致了晶體內部嚴重 的本質缺陷,因此吾人發展出一套新穎的製程生長等計量比鈮酸鋰(SLN )晶體,是為水 平式配合沈入式加熱器的區熔法。加熱器是由白金板所製成,而生長坩堝是由白金箔所製 成。由於區熔式的局部加熱,因此大大降低使用功率,經由小心的控制熱環境,可得到凸 的生長界面,且生長所得晶體已有大晶粒的產生,就組成和光學性質方面是相當好的。由 於熔湯和坩堝的潤濕現象,額外的晶粒容易從坩堝壁上生長出來,所以使得單晶生長依然困 難。不過,吾人可利用系統上方的視窗清楚的觀察晶體生長的情形,且提供了有用的資訊 可作為製程改善之用。 Lithium niobate (LiNbO3) is an important material in the optics industry for various applications. Typically, the lithium niobate (CLN) crystal grown from its congruent melt, i.e., Li/Nb= 48.4/51.6, contains a large Li-deficiency, which introduces significant intrinsic defects. A novel horizontal immersed- heater zone-leveling process was developed to grow near stoichiometric lithium niobate (SLN) crystals. The heater was made of a platinum plate and crucible was made of a pla tinum foil. Due to the localized heating, the power consumption was also low. Through a careful control of the thermal environment, a convex growth interface was obtained, and the grown crystal, having large grains, was reasonably good in terms of its composition and optical properties. Due to the wetting of the solution and the crucible, secondary grains were easily induced from the crucible wall, so that the growth of a single crystal was still difficult. Nevertheless, crystal growth could be observed clearly through the top window, and this provided useful information for process improvement. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/9419 | 其他識別: | 932214E002021 | Rights: | 國立臺灣大學化學工程學系暨研究所 |
顯示於: | 化學工程學系 |
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932214E002021.pdf | 403.19 kB | Adobe PDF | 檢視/開啟 |
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