Observation of the growth mechanisms of lithium niobate single crystal during a LHPG process

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題名:	Observation of the growth mechanisms of lithium niobate single crystal during a LHPG process
作者:	Chen,JC;Lee,YC;Hu,C
貢獻者:	機械工程研究所
關鍵詞:	ANGLE;MELT
日期:	1997
上傳時間:	2010-06-29 18:05:19 (UTC+8)
出版者:	中央大學
摘要:	In this study, we use a thermal radiometer to detect the thermal radiation of lithium niobate in a 3-5 mu m, and a 10.6 mu m spectrum for the laser heated pedestal growth (LHPG) system. A measurement technique developed according to the different radiation characteristics in each spectrum is employed to find the physical parameters during the growth of a lithium niobate crystal. The meniscus angle (phi(0)) for growing a constant diameter crystal is measured. The value of phi(0) at the facet tri-junction along the a-axis growth is - 4.3 degrees +/- 0.5 degrees, while phi(s) - 5.7 degrees +/- 0.5 degrees is found at the a-face of the c-axis growth. In addition, the temperature distribution is monitored during the growth. The maximum surface temperature gradient, which occurs at the growth interface, is extremely high, i.e. around several hundred degree per millimeter. The gradient decreases when the diameter of the grown crystal decreases.
關聯:	JOURNAL OF CRYSTAL GROWTH
顯示於類別:	[機械工程研究所] 期刊論文

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