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Compositional effects on the optical and thermal properties of potassium aluminophosphate glasses

Compositional effects on the optical and thermal properties of potassium aluminophosphate glasses
Compositional effects on the optical and thermal properties of potassium aluminophosphate glasses
The K2O–Al2O3–P2O5 glass system has been examined and various compositions have been melted. Their optical and thermal properties have been measured to assess their potential for athermalisation. The addition of alumina (Al2O3) increases the refractive index (n) and glass transition temperature (Tg) and decreases the thermal expansion coefficient (α), consequently leading to positive thermo-optic coefficient (dn/dT). In addition to thermal expansion, polarisability of the glass also affects dn/dT. Generally, glasses must exhibit negative dn/dT to counter thermal expansion, in order to have potential application in athermalisation.
athermal, thermal expansion coefficient, thermo-optic coefficient, phosphate glasses
323-330
Lee, E.T.Y.
c687873a-9418-4b42-a083-487f993b4ed4
Taylor, E.R.M.
cc92e3b4-87b4-42dd-ae10-4c6a4a849d71
Lee, E.T.Y.
c687873a-9418-4b42-a083-487f993b4ed4
Taylor, E.R.M.
cc92e3b4-87b4-42dd-ae10-4c6a4a849d71

Lee, E.T.Y. and Taylor, E.R.M. (2004) Compositional effects on the optical and thermal properties of potassium aluminophosphate glasses. Optical Materials, 27 (2), 323-330. (doi:10.1016/j.optmat.2004.02.029).

Record type: Article

Abstract

The K2O–Al2O3–P2O5 glass system has been examined and various compositions have been melted. Their optical and thermal properties have been measured to assess their potential for athermalisation. The addition of alumina (Al2O3) increases the refractive index (n) and glass transition temperature (Tg) and decreases the thermal expansion coefficient (α), consequently leading to positive thermo-optic coefficient (dn/dT). In addition to thermal expansion, polarisability of the glass also affects dn/dT. Generally, glasses must exhibit negative dn/dT to counter thermal expansion, in order to have potential application in athermalisation.

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Published date: November 2004
Keywords: athermal, thermal expansion coefficient, thermo-optic coefficient, phosphate glasses

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Local EPrints ID: 21016
URI: http://eprints.soton.ac.uk/id/eprint/21016
PURE UUID: 550b5095-311c-4d12-bb47-93485f7e424d

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Date deposited: 07 Mar 2006
Last modified: 07 Apr 2020 16:37

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