Investigation on relationship between platinum inclusion density and platinum redox equilibrium in phosphate laser glass

With absorptance spectra of platinum ions, relationship between platinum inclusion density and platinum redox equilibrium in R2O-BaO-P2O3 system phosphate laser glass was investigated. The results show that platinum inclusion density reduces as the equilibrium PtO?Pt2+?Pt4+ shifts towards right. With the melting temperature or O2 partial pressure of melting atmosphere increased, the equilibrium Pt0?Pt2+?Pt4+ shift towards right. When [Pt4+]/[Pt2+] is large enough, platinum inclusions can not be formed.