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US4661284A
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Silica and boron-containing ultraphosphate laser glass with low concentration quenching and improved thermal shock resistance
Assignee: United States Department of Energy
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Filing: 1985-09-25
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Granted: 1987-04-28
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Expires: 2005-09-25
Abstract
Abstract Neodymium-doped phosphate glasses having a refractive index, nd>1.520; an Abbe number, Vd, <60; a density <3.0 g/cm3, a thermal expansion coefficient, alpha , </=110x10-7 DEG C.-1; a Young's Modulus, E, <70x103 N/mm2; a Poisson's Ratio, nu , <0.28; a thermal conductivity, K, >0.5 W/mxK, a thermal FOM=(1- nu )xK/ alpha E>0.7, consisting essentially of, in mol. %: P2O5: 40-70% SiO2: 0-20% B2O3: 5-20% Sum SiO2+B2O3: 5-35% Sum Li2O+Na2O+K2O: 5-20% Sum La2O3+Nd2O3: 3-10% Sum MgO+CaO+SrO+BaO+ZnO: 0-10% and preferably containing an amount of Nd2O3 effective for laser activity having an emission cross-section, sigma , >3.5x10-20 cm2; a fluorescence linewidth ( DELTA lambda f1)<23.5 nm; a first e-folding time of the Nd3+ fluorescence at 0.5 wt. % Nd2O3>375 mu sec, and a first e-folding time of the Nd3+ fluorescence at 10 wt. % >175 mu sec at 10 wt. %, have very low self-concentration quenching rates.
Inventors
- 👤 Lee M. Cook
- 👤 Stanley E. Stokowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:26
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C4/00; C03C4/0071; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
141 words
An optical glass having a refractive index, nd>1.520; an Abbe number, Vd, >60; a density <3.0 g/cm 3 , a thermal expansion coefficient, α, ≦110×10 -7 °C. -1 ; a Young's Modulus, E, <70×10 3 N/mm 2 ; a Poisson's Ratio, ν, 0.28; a thermal conductivity, K, >0.5 W/m K; a thermal FOM=(1-ν)·K/αE>0.7, a first e-folding time of the Nd 3+ fluoresence at 0.5 wt % Nd 2 O 3 >375 μsec, and a first e-folding time of the Nd 3+ fluorescence at 10 wt. %>175 μsec. consisting essentially of, in mol. %: P 2 O 5 : 40-70% SiO 2 : 0-20% B 2 O 3 : 5-20% Sum SiO 2 +B 2 O 3 : 5-35% Sum Li 2 O+Na 2 O+K 2 O: 5-20% Sum La 2 O 3 +Nd 2 O 3 : 3-10% Sum MgO+CaO+SrO+BaO+ZnO: 0-10%.
Claim 2
Dependent Claim
141 words
An optical glass having a refractive index, nd>1.520; an Abbe number, Vd, >60; a density <3.0 g/cm 3 , a thermal expansion coefficient, α, ≦110×10 -7 °C. -1 ; a Young's Modulus, E, <70×10 3 N/mm 2 ; a Poisson's Ratio, ν, 0.28; a thermal conductivity, K, >0.5 W/m K; a thermal FOM=(1-ν)·K/αE>0.7, a first e-folding time of the Nd 3+ fluoresence at 0.5 wt % Nd 2 O 3 >375 μsec, and a first e-folding time of the Nd 3+ fluorescence at 10 wt. %>175 μsec. consisting essentially of, in mol. %: P 2 O 5 : 40-70% SiO 2 : 0-20% B 2 O 3 : 5-20% Sum SiO 2 +B 2 O 3 : 5-35% Sum Li 2 O+Na 2 O+K 2 O: 5-20% Sum La 2 O 3 +Nd 2 O 3 : 3-10% Sum MgO+CaO+SrO+BaO+ZnO: 0-10%.
Claim 3
Dependent Claim
36 words
An optical glass of claim 1 having the following properties: nd: 1.525-1.537 Vd: 63-67 density: 2.6-2.8 g/cm 3 α: 80-100×10 -7 °C. -1 E: 45-55×10 3 N/mm 2 ν: 0.20-0.25 K: 0.6-0.8 W/mK Thermal FOM: 0.9-1.2.
Claim 4
Dependent Claim
36 words
An optical glass of claim 1 containing an amount of Nd 2 O 3 effective for laser activity having an emission cross-section, σ, >3.5×10 -20 cm 2 , and a fluorescence linewidth (Δλ f1 )<23.5 nm.
Claim 5
Dependent Claim
48 words
An optical glass of claim 3 having the following properties: σ: 3.8-4.5×10 20 cm 2 Δλ f1 : 21-23 nm first e-folding time at 0.5 wt. % Nd 2 O 3 : 385-400 μsec first e-folding time at 10 wt. % Nd 2 O 3 : 180-185 μsec.
Claim 6
Dependent Claim
35 words
An optical glass of claim 2 containing an amount of Nd 2 O 3 effective for laser activity, having an emission cross-section, σ, >3.5×10 -20 cm 2 ; a fluorescence linewidth (Δλ f1 )<23.5 nm.
Claim 7
Dependent Claim
48 words
An optical glass of claim 2 having the following properties: σ: 3.87-4.5×10 20 cm 2 Δλ f1 : 21-23 nm first e-folding time at 0.5 wt. % Nd 2 O 3 : 385-400 μsec first e-folding time at 10 wt. % Nd 2 O 3 : 180-185 μsec.
Claim 8
Dependent Claim
13 words
An optical glass of claim 1 wherein the only alkali metal is K.
Claim 9
Dependent Claim
60 words
An optical glass of claim 1 consisting essentially of in mol. %: P 2 O 5 : 50-60% SiO 2 : 10-20% B 2 O 3 : 10-15% Sum SiO 2 +B 2 O 3 : 15-35% Sum Li 2 O+Na 2 O+K 2 O: 5-10% Sum La 2 O 3 +Nd 2 O 3 : 5-8% Sum MgO+CaO+SrO+BaO+ZnO: 5-10%.
Claim 10
Dependent Claim
61 words
An optical glass of claim 1 consisting essentially of: 50-60 mol. % P 2 O 5 10-20 mol. % SiO 2 10-15 mol. % B 2 O 3 5-10 mol. % K 2 O 0-10 mol. % ZnO 4.5-5.5 mol. % sum La 2 O 3 +Nd 2 O 3 1- 35mol. % sum SiO 2 +B 2 O 3 .
Claim 11
Dependent Claim
24 words
An optical glass of claim 9 wherein the sum of La 2 O 3 and Nd 2 O 3 is about 5 mol. %.
Claim 12
Dependent Claim
47 words
An optical glass of claim 1 consisting essentially of, in mol. %: P 2 O 5 : about 60% SiO 2 : about 10% B 2 O 3 : about 15% K 2 O: about 10% Nd 2 O 3 +La 2 O 3 : about 5%.
Claim 13
Dependent Claim
47 words
An optical glass of claim 1 consisting essentially of, in mol. %: P 2 O 5 : about 55% SiO 2 : about 15% B 2 O 3 : about 20% K 2 O: about 5% Nd 2 O 3 +La 2 O 3 : about 5%.
Claim 14
Dependent Claim
50 words
An optical glass of claim 1 consisting essentially of, in mol. %: P 2 O 5 : about 55% SiO 2 : about 20% B 2 O 3 : about 5% K 2 O: about 5% ZnO: about 10% La 2 O 3 +Nd 2 O 3 : about 5%.
Claim 15
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 1.
Claim 16
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 3.
Claim 17
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 4.
Claim 18
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 6.
Claim 19
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 8.
Claim 20
Dependent Claim
21 words
In a laser device comprising a glass active medium, the improvement wherein the active medium is a glass of claim 9.
Claim 21
Dependent Claim
134 words
In a laser device comprising a glass active medium, the improvement wherein the active medium consists essentially of, in mol. %, about 60% P 2 O 5 , about 10% SiO 2 , about 15% B 2 O 3 , about 10% K 2 O and about 5% (Nd 2 O 3 +La 2 O 3 ); or about 55% P 2 O 5 , about 15% SiO 2 , about 20% B 2 O 3 , about 5% K 2 O, and about 5% (Nd 2 O 3 +La 2 O 3 ); or about 55% P 2 O 5 , about 20% SiO 2 , about 5% B 2 O 3 , about 5% K 2 O; about 10% ZnO, and about 5% (La 2 O 3 +Nd 2 O 3 ).
Claim 22
Dependent Claim
134 words
In a laser device comprising a glass active medium, the improvement wherein the active medium consists essentially of, in mol. %, about 60% P 2 O 5 , about 10% SiO 2 , about 15% B 2 O 3 , about 10% K 2 O and about 5% (Nd 2 O 3 +La 2 O 3 ); or about 55% P 2 O 5 , about 15% SiO 2 , about 20% B 2 O 3 , about 5% K 2 O, and about 5% (Nd 2 O 3 +La 2 O 3 ); or about 55% P 2 O 5 , about 20% SiO 2 , about 5% B 2 O 3 , about 5% K 2 O; about 10% ZnO, and about 5% (La 2 O 3 +Nd 2 O 3 ).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |