2:30 PM - 2:45 PM [11p-N104-5] Doping effect of fluorine to Bi2O3-containing oxide glasses with small photoelasticity (2): Comparison of silicate and borate glasses in optical and mechanical properties 〇(D)Katsuki Hayashi1, Tatsuki Shimizu1, Akira Saitoh1 (1.Ehime Univ.)