Phosphate glass useful in high power lasers

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867409

Hayden, Joseph S ^[1]; Sapak, David L ^[2]; Ward, Julia M ^[3]

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1. South Abington Township, Lackawana County, PA
2. Avoca, PA
3. Hollidaysburg, PA

A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K.sub.90.degree. C. >0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., consists essentially of (on a batch composition basis): the amounts of Li.sub.2 O and Na.sub.2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K.sub.90.degree. C. >0.8 W/mK and .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., and wherein, when the batch composition is melted in contact with a silica-containing surface, the final glass composition contains at most about 3.5 mole % of additional silica derived from such contact during melting. The Nd.sub.2 O.sub.3 can be replaced by other lasing species.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• Assignee: Schott Glass Technologies, Inc. (Duryea, PA)
• Patent Number(s): US 4929387
• OSTI ID: 867409
• Country of Publication: United States
• Language: English

Related Subjects

phosphate
glass
useful
power
lasers
low-
no-silica
laser
medium
thermal
conductivity
90
degree
mk
coefficient
expansion
alpha
20
-40
80
times
10
-7
consists
essentially
batch
composition
basis
mole
45-70
15-35
na
0-10
10-15
01-6
0-6
sio
0-8
mgo
0-18
cao
0-15
sro
0-9
bao
zno
amounts
providing
average
alkali
metal
ionic
radius
sufficiently
whereby
melted
contact
silica-containing
surface
final
contains
additional
silica
derived
melting
replaced
lasing
species
power lasers
composition contains
thermal conductivity
thermal expansion
alkali metal
glass composition
consists essentially
power laser
laser medium
phosphate glass
composition basis
glass useful
ionic radius
batch composition
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