抄録
When glass or isotropic solid are acted upon by stress, they show birefringence called photoelasticity. These stresses in optical devices such as glass fiber, sensor, waveguide and display panel and so on reduce optical properties, so photoelasticity becomes one of the important properties of optical materials. There are several methods for the analysis of photoelasticity. However, those methods bring the different photoelastic constant (PEC), because the retardation includes the strain and residual stress.
In this work, the photoelasticity of RO-P2O5 glasses (R: Zn and Sn etc.) are studied by the retardation with road using frequency stabilized transverse Zeeman laser. This method is possible a precision measurement because of considering the stress as a vector factor. In the case of SnO-P2O5 glasses with 47 ~ 72 mol% SnO, the PEC is about 0.63 ~ 1.90 x 10-12 Pa-1 at 633nm and increases with increasing SnO concentration. The variation of PEC with SnO concentration is considered as the role of SnO in glass networks. The effects of the characteristics of constituent ions on photoelasticity are discussed.
