Influence of $${\hbox {Bi}}_{2} {\hbox {O}}_{3}$$Bi2O3, $${\hbox {Sb}}_{2} \hbox {O}_{3}$$Sb2O3 and $${\hbox {Y}}_{2} {\hbox {O}}_{3}$$Y2O3 on optical properties of $${\hbox {Er}}_{2} {\hbox {O}}_{3}$$Er2O3-doped $$\hbox {CaO}$$CaO–$${\hbox {P}}_{2} {\hbox {O}}_{5} $$P2O5–$$ {\hbox {B}}_{2} {\hbox {O}}_{3}$$B2O3 glasses

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