Photoelastic Properties of SnO-P₂O₅ Glasses

Abstract

The photoelasticity of SnO-P₂O₅ (SP) glasses was studied using the photoelastic method which is the most practical way to know the stress of materials. Transparent SnO-P2O5 glasses were prepared by melting at over 880 ^oC with carbon crucibles. The photoelastic constant (PEC) was measured with the difference of retardation using frequency stabilized transverse Zeeman laser. In the case of SnO-P₂O₅ glasses with 62 - 72 mol% SnO, the PEC is about 0.94 - 1.90 x 10^-12 Pa^-1 at 633nm and increases with increasing SnO concentration.