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US 12,741,901 B2Granted
Athermal glasses and athermal systems for infrared optics
AssigneeSchott AG
InventorMark J. Davis
Life of this patent
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Abstract
Athermal glasses and athermal systems for infrared optical components and systems are disclosed.
Claims2
An optical lens system, the system comprising:
- one or more lenses,
- wherein at least one of the one or more lenses comprises a chalcogenide glass composition,
- wherein the chalcogenide glass composition is represented by the formula:
- yAs
- +
- (
- 1
-
- 0
-
- 0
- -
- y
- )
- [
- x
-
- S
- +
- (
- 1
-
- 0
-
- 0
- -
- x
- )
-
- S
-
- e
- ]
- where 10≤y≤40 and 0≤x≤100 in atomic %,
- wherein the chalcogenide glass composition has a figure-of-merit (FOM) calculated as:
- FOM
- =
- (
- 1
- n
- g
- -
- n
- m
- )
- [
- dn
- g
- dT
- -
- n
- g
- n
- m
-
- dn
- m
- dT
- ]
- -
- α
- where α is a linear thermal expansion of the lens comprising the chalcogenide glass composition,
- T is a temperature,
- ng is a refractive index of the lens, and
- nm is a refractive index of the surrounding medium, and
- wherein
- -
- (
- FOM
- )
- ≥
- 30
-
- ppm
- °
-
- C
- .
- .
76 more elements
Dependencies are inferred from the claim text.