Measurements of optical properties of some molten oxides

A method based on a fine-focussed optical laser has been developed to measure the spectral reflectance and the transmittance of small ( ∽ 1 mm) liquid or single crystal materials. The measured normal spectral emittance for 633 nm light is about 0.9 for several molten refractory oxides, 0.8 for lithi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of crystal growth 1990-11, Vol.106 (2), p.221-226
Main Authors: Nason, D.O., Yen, C.T., Tiller, W.A.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Holography
Optics
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A method based on a fine-focussed optical laser has been developed to measure the spectral reflectance and the transmittance of small ( ∽ 1 mm) liquid or single crystal materials. The measured normal spectral emittance for 633 nm light is about 0.9 for several molten refractory oxides, 0.8 for lithium niobate and 0.7 for molten sapphire. Sapphire and YAG experience a several-fold increase in emittance on melting. The absorption coefficient and the thickness for opaqueness are calculated and some consequences of the partial transparency of small hot materials, when their temperatures are measured by optical pyrometry, are discussed.
ISSN:0022-0248
1873-5002
DOI:10.1016/0022-0248(90)90067-U