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Increase in Optical Transparency by Reduction in Pb Content of LPE Garnet Films

IP.com Disclosure Number: IPCOM000080877D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Cronemeyer, DC: AUTHOR [+3]

Abstract

An increased sensitivity in the optical sensing of bubble domains is obtained, by reducing the optical masking effect of Pb through growth at relatively high temperatures.

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Increase in Optical Transparency by Reduction in Pb Content of LPE Garnet Films

An increased sensitivity in the optical sensing of bubble domains is obtained, by reducing the optical masking effect of Pb through growth at relatively high temperatures.

According to electron microprobe measurements, the lead content of films grown by liquid phase epitaxy (LPE) from PbO:B(2)O(3) flux varies considerably with growth temperature. The optical absorption of a set of Eu(2.3)Y(0.7)Fe(5)O(12) garnet films on (100) Sm(3)Ga(5)O(12) garnet substrates has been measured by a differential technique, utilizing a 1 wt. % Pb content garnet film in the reference beam of a CARY 14 (Applied Physics Corp.) spectrophotometer. The presence of up to 5 wt. % Pb causes a broad absorption maximum which peaks at about 4800 angstroms. At this wavelength, the added absorption coefficient is 2200 cm-1 per wt. % Pb for the above composition. The differential optical absorption coefficient characteristic is shown by the graph.

The increased optical transparency near 5000 Angstroms obtainable by high- temperature growth in the PbO flux system is useful for optical sensing of magnetic bubbles. The laser wavelengths 4880 Angstroms and 6328 A are in the range of interest. PbO flux is suitable for the growth of high quality LPE garnet films.

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