Schott Glass Technologies, Inc.

Julia M Ward

Joseph S Hayden

David L Sapak

A low- or no-silica phosphate glass useful as a high average power laser medium and having a high thermal conductivity, K.sub.90.degree. C. &gt;0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-300.degree. C. &lt;90.times.10.sup.-7 /.degree.C., consisting essentially of (on a batch composition basis):

Phosphate glass useful in high power lasers

A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K.sub.90.degree. C. &gt;0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-40.degree. C. &lt;80.times.10.sup.-7 /.degree.C., consists essentially of (on a batch composition basis):

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Hollidaysburg, PA, United States of America

Julia M Ward