On the thermo-optic coefficient of P2O5 in SiO2

P. Dragic, M. Cavillon, J. Ballato

Research output: Contribution to journalArticlepeer-review


Measurements of the thermo-optic coefficient (dn/dT) are made on a binary phosphosilicate core glass optical fiber. Using these results, dn/dT for the P2O5 constituent is found to be -13.3 × 10-6 ± 8.0% K-1, a value much lower in magnitude than reported in the literature for this system. Its accurate elucidation is especially useful in guiding the design of low- or negative-thermo-optic glasses and optical fibers. The phosphosilicate core also has a coefficient of thermal expansion that is higher than that of the pure silica cladding. As a result, the clad fiber geometry slightly lessens the effectiveness of the negative-valued contribution to dn/dT by P2O5 relative to bulk glass.

Original languageEnglish (US)
Article number304211
JournalOptical Materials Express
Issue number10
StatePublished - 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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