Temperature dependence of the emittance of LiF and LiNbO3 in the near-infrared spectra

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Title:	Temperature dependence of the emittance of LiF and LiNbO3 in the near-infrared spectra
Authors:	Chen,JC;Hu,C;Lee,YC
Contributors:	機械工程研究所
Keywords:	FLOAT-ZONE;LITHIUM-NIOBATE
Date:	1998
Issue Date:	2010-06-29 18:04:41 (UTC+8)
Publisher:	中央大學
Abstract:	This study investigates the temperature dependence of the normal emittance in 3-5, 5, 10.6 and 8-12 mu m spectral ranee for LiNbO3 and LiF rods with both crystal and polycrystalline structures. According to the results, the normal emittance in the near-infrared spectra increases with increasing wavelength. The normal emittances at 10.6 and 8-12 mu m are not only invariant with temperature, but also exceed 0.9. When the temperature increases. the normal emittances at 3-5 and 5 mu m for the LiF single-crystal rod continuously increase regardless of the phase change from the solid state to the liquid state. Before the temperature reaches the Curie point, the normal emittances at 3-5 and 5 mu m for the LiNbO3 single-crystal I od increase with increasing temperature. The normal emittances at 3-5 and 5 mu m then decrease as the temperature further increases. A significant decrease in the normal emittance at 3-5 and 5 mu m occurs when the emission is only from the melt. In addition. the magnitudes of the normal emittance at 3-5 and 5 mu m are enhanced by the scattering effect due to the porous structure of the solid.
Relation:	JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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