Phosphate glass useful in high power lasers
First Claim
1. A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K90°
- C. >
0.8 W/mK, and a low coefficient of thermal expansion, α
20°
-40°
C. <
80×
10-7 /°
C., consisting essentially of (on a batch composition basis);
space="preserve" listing-type="tabular">______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 15-35 Na.sub.2 O 0-10 Al.sub.2 O.sub.3 10-15 K.sub.2 O 0-3 lasable ion 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 Bao 0-9 ZnO 0-15 ______________________________________ the amounts of Li2 O and Na2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K90°
C. >
0.8 W/mK and α
20°
-40°
C. <
80×
10-7 /°
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K90° C. >0.8 W/mK, and a low coefficient of thermal expansion, α20°-40° C. <80×10-7 /°C., consists essentially of (on a batch composition basis):
______________________________________
Mole % ______________________________________ P2 O5 45-70 Li2 O 15-35 Na2 O 0-10 Al2 O3 10-15 Nd2 O3 0.01-6 La2 O3 0-6 SiO2 0-8 B2 O3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 ______________________________________
the amounts of Li2 O and Na2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K90° C. >0.8 W/mK and α20°-40° C. <80×10-7 /°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 Nd2 O3 can be replaced by other lasing species.
-
Citations
23 Claims
-
1. A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K90°
- C. >
0.8 W/mK, and a low coefficient of thermal expansion, α
20°
-40°
C. <
80×
10-7 /°
C., consisting essentially of (on a batch composition basis);
space="preserve" listing-type="tabular">______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 15-35 Na.sub.2 O 0-10 Al.sub.2 O.sub.3 10-15 K.sub.2 O 0-3 lasable ion 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 Bao 0-9 ZnO 0-15 ______________________________________the amounts of Li2 O and Na2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K90°
C. >
0.8 W/mK and α
20°
-40°
C. <
80×
10-7 /°
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23)
- 6. A class of claim 4, consisting essentially of (on a batch composition basis)
- space="preserve" listing-type="tabular">______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 50-65 Li.sub.2 O 15-30 Na.sub.2 O 0-5 K.sub.2 O 0 Al.sub.2 O.sub.3 10-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0 B.sub.2 O.sub.3 0-5 MgO 0-12 CaO 0-12 SrO 0-6 BaO 0-6 ZnO 0-12. ______________________________________
- C. >
- 7. A glass of claim 4, consisting essentially of (on a batch composition basis)
- space="preserve" listing-type="tabular">______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 55-65 Li.sub.2 O 18-30 Na.sub.2 O 0 K.sub.2 O 0 Al.sub.2 O.sub.3 10-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0 B.sub.2 O.sub.3 0 MgO 0-9 CaO 0-9 SrO 0-4 BaO 0-4 ZnO 0-9. ______________________________________
- C. ≧
0.85 and α
20°
-40°
C. <
77.
space="preserve" listing-type="tabular">______________________________________ Damaging inclusions per liter essentially zero Strengthenability ≧
4 x Young'"'"'s Modulus (E) <
72 ×
10.sup.3 N/mm.sup.2 Poisson'"'"'s Ratio (ν
) <
0.230 Cross section (σ
) >
3.5 ×
10.sup.-20 cm.sup.2 Fluorescence lifetime (5% Nd) >
250 μ
sec. ______________________________________
-
19. A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K90°
- C. >
0.8 W/mK, and a low coefficient of thermal expansion, α
20°
-40°
C. <
80×
10-7 /°
C., consisting essentially of (on a batch composition basis);
space="preserve" listing-type="tabular">______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 15-35 Na.sub.2 O 0-10 K.sub.2 O 0 Al.sub.2 O.sub.3 10-15 lasing ion 0-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0 B.sub.2 O.sub.3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 ______________________________________the amounts of Li2 O and Na2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K90°
C. >
0.8 W/mK and α
20°
-40°
C. <
80×
10-7 /°
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.
- C. >
Specification