	US 12,012,360 B2
	Athermal glasses and athermal systems for infrared optics
Mark J. Davis, Clarks Summitt, PA (US)
Assigned to SCHOTT CORPORATION, Elmsford, NY (US)
Filed by SCHOTT CORPORATION, Elmsford, NY (US)
Filed on Jun. 11, 2020, as Appl. No. 16/898,985.
Application 16/898,985 is a continuation of application No. PCT/US2018/064873, filed on Dec. 11, 2018.
Claims priority of provisional application 62/596,932, filed on Dec. 11, 2017.
Prior Publication US 2020/0299182 A1, Sep. 24, 2020
Int. Cl. C03C 3/32 (2006.01); C03C 13/04 (2006.01); G01L 1/24 (2006.01); G02B 6/02 (2006.01); H01S 3/17 (2006.01)

CPC C03C 3/321 (2013.01) [C03C 13/048 (2013.01); G01L 1/242 (2013.01); G02B 6/0219 (2013.01); H01S 3/171 (2013.01); C03C 2213/00 (2013.01)]

5 Claims

1. A system, the system comprising:

an etalon or a fiber-based strain sensor, the etalon or the fiber-based strain sensor having a chalcogenide glass composition,

wherein the chalcogenide glass composition is represented by:

y As+(100−y)[x S+(100−x)Se]

wherein 10≤y≤40, and 0≤x≤100 in atomic %,

wherein the chalcogenide glass composition has a figure-of-merit (FOM) calculated as:

where α is a linear thermal expansion of the etalon or a fiber-based strain sensor,

T is a temperature,

n is a refractive index, and

n_absis an absolute change in refractive index with respect to the temperature, and

wherein