Bibliographic Details
| Title: |
Thermo-optic coefficient in some hybrid organic/inorganic fast sol–gel glasses |
| Authors: |
Pokrass, M.1, Burshtein, Z.2, Gvishi, R.1 rgvishi@soreq.gov.il |
| Source: |
Optical Materials. Jul2010, Vol. 32 Issue 9, p975-981. 7p. |
| Subjects: |
Organic compounds, Thermal properties, Optical properties, Glass-ceramics, Methyl groups, Silica, Reflectance, Temperature effect, Thermal expansion |
| Abstract: |
Abstract: We have investigated the effect of organic content in hybrid organic/inorganic glasses prepared by the sol–gel process on the thermo-optic coefficient dn/dT. The organic phase consisted of homogeneously dispersed methyl groups within an inorganic silica matrix. Analysis of Fresnel reflectance temperature dependence of an optically polished sample-surface yielded the desired value, with an accuracy of 10−5/°C. A negative linear dependence of the thermo-optic coefficient on the volumetric thermal expansion coefficient β was obtained, dn/dT[10−4/°C]=−1.1–0.45β[10−4/°C]. Using Prod’homme’s model, a negative value was derived for the electronic polarizability coefficient Φ =(−1.8±0.3)×10−4/°C. The negative sign of Φ is attributed to isolation of the silica matrix sections by the methyl groups, causing the sections to distance upon increase in temperature. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
