The photoelastic constants of the alumina component in aluminosilicate optical fibers are evaluated and determined to be $p_{11}=-0.237\pm 0.020$ and $p_{12}=-0.027\pm 0.012$, thus confirming that the low and negative $p_{ij}$ characteristics of bulk alumina are conserved as part of a binary aluminosilicate glass system in optical fiber form. In order to enumerate these values, the strain- and stress-optic coefficients of two fibers (one with an aluminosilicate core and one with a pure silica core) were measured by applying mechanical tension or twist, respectively, to the fibers and measuring changes to an optical system as a function of the mechanical deformation. In the former, the strain-optic coefficient ($\epsilon \mathrm{OC}$) is measured directly by recording changes to the free spectral range of a ring fiber laser. In the latter, the stress-optic coefficient ($\sigma \mathrm{OC}$) is found by measuring the change in polarization angle after linearly polarized light propagates through a segment of twisted test fiber. To the best of our knowledge, this is the first such measurement of its type, i.e., the retrieval of the component photoelastic constants, with their signs, of a multicomponent glass. Binary glass compositions wherein the constituents have opposite signs of the photoelastic constant (such as the aluminosilicates) have the potential to give rise to extremely low values of the Brillouin gain coefficient.

© 2013 Optical Society of America

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