US2017362115A1PendingUtilityA1
Method of making halogen doped optical element
Est. expiryNov 26, 2034(~8.3 yrs left)· nominal 20-yr term from priority
C03C 3/06C03B 2201/12C03B 19/1453C03B 19/066C03B 19/1461C03B 2201/42C03B 2201/20C03B 2201/075C03B 37/01282C03B 37/01453C03B 25/02G02B 6/036C03B 37/014C03B 37/01853C03B 37/01446
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Claims
Abstract
A method of forming an optical element is provided. The method includes producing silica-based soot particles using chemical vapor deposition, the silica-based soot particles having an average particle size of between about 0.05 μm and about 0.25 μm. The method also includes forming a soot compact from the silica-based soot particles and doping the soot compact with a halogen in a closed system by contacting the silica-based soot compact with a halogencontaining gas in the closed system at a temperature of less than about 1200° C.
Claims
exact text as granted — not AI-modified1 . A method of forming an optical element, the method comprising:
producing silica-based soot particles using chemical vapor deposition, the silica-based soot particles having an average particle size of between about 0.05 μm and about 0.25 μm; forming a soot compact from the silica-based soot particles; and doping the soot compact with a halogen in a closed system by contacting the silica-based soot compact with a halogen-containing gas in the closed system at a temperature of less than about 1200° C.
2 . The method of claim 1 , wherein forming a soot compact comprises depositing the silica-based soot particles onto a bait rod.
3 . The method of claim 1 , wherein forming a soot compact comprises pressing the silica-based soot particles at a pressure of between about 100 psi and about 1000 psi.
4 . The method of claim 3 , wherein pressing the silica-based soot particles comprises axially pressing the silica-based soot particles to form a disc shaped soot compact.
5 . The method of claim 1 , further comprising maintaining a predetermined halogen-containing gas composition in the closed system.
6 . The method of claim 5 , wherein maintaining a predetermined halogen-containing gas composition in the closed system comprises bleeding halogen-containing gas into the closed system.
7 . The method of claim 1 , wherein doping the soot compact comprises maintaining a halogen composition in the closed system of greater than about 90% of the total gas composition of the closed system.
8 . The method of claim 1 , further comprising maintaining a predetermined halogen-containing gas partial pressure in the closed system.
9 . The method of claim 8 , wherein the predetermined halogen-containing gas partial pressure in the closed system is between about 0.10 atm and about 0.90 atm.
10 . The method of claim 1 , wherein the halogen-containing gas is a fluorine-containing gas.
11 . The method of claim 1 , wherein the halogen-containing gas is a chlorine-containing gas.
12 . The method of claim 1 , further comprising consolidating the soot compact in the closed system to form a glass article.
13 . The method of claim 12 , wherein consolidating the soot compact is sufficient to form a glass article comprising a variation of halogen concentration of less than about 0.20 wt. %.
14 . The method of claim 1 , wherein the silica-based soot particles comprise silica and titania.
15 . The method of claim 1 , wherein the silica-based soot particles have a surface area of greater than about 10 m 2 /gram.
16 . A method of forming an optical element, the method comprising:
producing silica-based soot particles using chemical vapor deposition, the silica-based soot particles having an average particle size of between about 0.05 μm and about 0.25 μm; forming a soot compact from the silica-based soot particles; doping the soot compact with a halogen in a closed system by contacting the soot compact with a halogen-containing gas in the closed system at a temperature of less than about 1200° C.; and consolidating the soot compact in the closed system to form a glass article by simultaneously increasing the temperature in the closed system and decreasing the concentration of the halogen-containing gas in the closed system.
17 . The method of claim 16 , wherein forming a soot compact comprises depositing the silica-based soot particles onto a bait rod.
18 . The method of claim 16 , wherein forming a soot compact comprises pressing the silica-based soot particles at a pressure of between about 100 psi and about 1000 psi.
19 . The method of claim 18 , wherein pressing the silica-based soot particles comprises axially pressing the silica-based soot particles to form a disc shaped soot compact.
20 . The method of claim 16 , wherein decreasing the concentration of the halogen-containing gas in the closed system comprises decreasing the concentration of the halogen-containing gas according to the following equation:
y
II
=
y
I
,
dop
Exp
[
-
21741
(
(
1
T
I
,
dop
)
-
(
1
T
II
)
)
]
,
wherein: T I,dop is the temperature in the closed system when doping the soot compact with halogen;
T II is the temperature in the closed system when consolidating the soot compact;
y I,dop is the concentration in mole fraction of the halogen-containing gas in the closed system when doping the soot compact with halogen; and
y II is the maximum concentration in mole fraction of the halogen-containing gas in the closed system when consolidating the soot compact at T II .
21 . The method of claim 16 , further comprising annealing the glass article by cooling the glass article in the closed system at a temperature of between about 900° C. and about 1100° C. and maintaining the temperature between about 900° C. and about 1100° C. for less than about 10 hours.
22 . The method of claim 21 , wherein annealing the glass article is sufficient to form a glass article having a fictive temperature of less than about 1100° C.
23 . The method of claim 16 , further comprising decreasing the temperature of the closed system to between about 700° C. and about 850° C. at a rate of less than about 10° C. per hour.
24 . The method of claim 16 , wherein doping the soot compact further comprises maintaining a predetermined halogen-containing gas composition in the closed system.
25 . The method of claim 16 , wherein doping the soot compact comprises maintaining a halogen composition in the closed system of greater than about 90% of the total gas composition of the closed system.
26 . The method of claim 16 , wherein doping the soot compact further comprises maintaining a predetermined halogen-containing gas partial pressure in the closed system.
27 . The method of claim 26 , wherein the predetermined halogen-containing gas partial pressure in the closed system is between about 0.10 atm and about 0.90 atm.
28 . The method of claim 16 , wherein the halogen-containing gas is a fluorine-containing gas.
29 . The method of claim 16 , wherein the halogen-containing gas is a chlorine-containing gas.
30 . The method of claim 16 , wherein consolidating the soot compact is sufficient to form a glass article comprising a variation of halogen concentration of less than about 0.20 wt. %.
31 . The method of claim 16 , wherein the silica-based soot particles comprise silica and titania.
32 . The method of claim 16 , wherein the silica-based soot particles have a surface area of greater than about 10 m 2 /gram.Join the waitlist — get patent alerts
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