The stress-optical coefficients of binary and ternary borate glasses were measured and the factor ( p -q ) , wherep and q are the Neumann strain-optical coefficients, was determined. As a modifier oxide was added to B2O3 glass, the stress-optical coefficient decreased monotonically. It was found that the stressoptical coefficient is determined mainly by the elastic modulus, but the factor ( p -q ) becomes significant when the content and polarizability of the modifier cation are high. It was also found that the factor ( p -q ) decreases when the content and polarizability of the modifier cation increase. The ( p -q ) was divided into the lattice effect and the atomic effect, and their compositional dependences were discussed.
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