Abstract
Laser action together with upconversion processes which produce green, orange, and red emissions in Nd3+-doped lead–niobium–germanate bulk glass (60GeO2–25PbO–15Nb2O5) have been investigated. The upconversion processes were conducted in such a way that the dynamics of the visible fluorescence was analyzed under lasing and non-lasing conditions. The features present in the time resolved upconverted emission show the existence of excited state absorption of both pump radiation and laser emission.
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