Alkaline metal dopants and photodarkening in colored filter glass

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Abstract
It is clearly shown for the first time that alkaline metal ions assist the photodarkening effect in colored filter glass. Time responses of samples vary depending on the kind of alkaline metal dopants involved as additive compounds for improving glass quality. Energy relaxation times of photoexcited carriers after laser beam irradiation change following weight quotients of potassium oxides from sodium oxides. The fastest response after irradiation can be obtained when the quotient is approximately two. This quotient corresponds to compositions showing conspicuous mixed-alkali effects from potassium and sodium.