Estimation of Photo-Elastic Coefficients in Ion-Exchanged Borosilicate Glass Cavities Through Whispering Gallery Mode Resonation

Whispering gallery mode (WGM) resonation has been used for tracing modal distribution in thermally poled glass hetero-cavities {Korakas, 2022 #7516}, or for measuring the photo-elasticity (Pockels' coefficients) in cylindrical glass [2], or polystyrene [3] cavities. Photo-elasticity is a significant physical quantity correlating the molecular refractivity of a material with its mechanical properties (Poisson ratio and Young modulus), which can shed light on its molecular structure.