This work reports the intense emission at in a -codoped fluorophosphate (FP) host glass. This FP glass shows good thermal stability and high transmittance around . The emission characteristic and energy transfer upon excitation of a conventional laser diode are investigated. The prepared glass possesses higher spontaneous transition probability () along with a larger calculated emission cross section corresponding to the laser transition . In addition, the effect of codoping on the photoluminescence in FP glass is demonstrated. Hence, the advantageous spectroscopic characteristics of -codoped FP glass together with the outstanding thermal property indicate that this kind of glass may become an attractive host for developing solid-state lasers at around .
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