Synthesis and infrared photoluminescence around 2.9 μm from Dy 3 + /Tm 3 + codoped fluorophosphate glass

Abstract

Fluorophosphate glasses co-doped with Dy 3 + and Tm 3 + ions have been synthesized with low OH content. Photoluminescence around 2.9 μm is successfully obtained in present glass excited by a conventional 808 nm laser diode. The luminescence characteristics and energy transfer mechanism are investigated. Based on the absorption, fluorescence spectra and lifetime measurements, Tm 3 + ions can effectively absorb excitation energy and then play an important role in getting 2.9 μm emission. Besides, it is found that Tm 3 + ions can transfer their energy to Dy 3 + ions with high efficiency. Hence, the results indicate that Dy 3 + /Tm 3 + co-doped fluorophosphate glass possessing advantageous spectroscopic characteristics is a potential cost-effective host for the mid-infrared solid state lasers.