Laser-fused refractory oxides for optical coatings

Swarnalatha, M and Stewart, AF and Guenther, AH and Carnigli, CK (1991) Laser-fused refractory oxides for optical coatings. In: Materials Science and Engineering: B, 10 (3). pp. 241-246.

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Abstract

Laser sintering was carried out using a high power continuous-wave CO2 laser to prepare pellets of zirconia (ZrO2), hafnia (HfO2) and yttria (Y2O3) mixed oxides as starting materials in the deposition of optical coatings. Hardened recrystallized pellets appeared to have been formed during laser treatment. X-ray diffraction analysis revealed a monoclinic-to-tetragonal phase transformation in the binary system while the ternary system was found to have a mixture of two crystalline phases. Cross-sectional scanning electron microscopy showed two isothermal crystalline regions in the ternary system. The optical inhomogeneity was low in the films deposited from the laser-fused pellets, but the absorption at a wavelength of 351 nm increased with increasing HfO2 content. The films deposited from laser-fused pellets were analysed by electron spectroscopy for chemical analysis and found to be stoichiometric and homogeneous.

Item Type:	Journal Article
Publication:	Materials Science and Engineering: B
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	23 Nov 2010 10:25
Last Modified:	23 Nov 2010 10:25
URI:	http://eprints.iisc.ac.in/id/eprint/33928

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