MEASUREMENT OF THE FLOAT-ZONE INTERFACE SHAPE FOR LITHIUM-NIOBATE

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > journal & Dissertation > Item 987654321/27071

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27071

Title:	MEASUREMENT OF THE FLOAT-ZONE INTERFACE SHAPE FOR LITHIUM-NIOBATE
Authors:	CHEN,JC;HU,C
Contributors:	機械工程學系
Keywords:	CRYSTAL-MELT INTERFACE;SINGLE-CRYSTAL;OPTICAL FIBERS;GROWTH;RESOLUTION
Date:	1995
Issue Date:	2010-06-29 18:06:59 (UTC+8)
Publisher:	中央大學
Abstract:	A new technique has been developed to locate the interface shape in the floating zone of lithium niobate materials. The floating zone is formed and uniformly heated by a CO2 laser with an axisymmetric ring-shaped beam generated by an axicon optical system. The emitted thermal radiation from the hot object has been measured by an imaging radiometer. The interference of the CO2 laser with the measurement of the radiometer is avoided by setting the spectral bandpass of radiation to 3-5 mu m. The location of the gas-solid or gas-melt interface is determined through the significant difference of the emitted radiation between the solid or melt and the background. Since the lithium niobate is viewed as a semitransparent material and the emittances of the solid and melt are significantly different, the locations of the melt-solid and gas-melt-solid interfaces are determined according to the change of the emitted radiation intensity. The floating zone is resolidified, and the interior of the resultant solid is observed by SEM (scanning electron microscopy) to identify the location and shape of the melt-solid interface. The results predicted by the variation of radiation intensity are consistent with those observed from the SEM.
Relation:	JOURNAL OF CRYSTAL GROWTH
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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