Abstract
In the present Letter, a high-emission intensity of 2.0 μm is reported for co-doped fluoride glass sensitized by ions under 1550 nm excitation. The measured absorption spectra do not show clustering in the local ligand field, which also demonstrates that ions are efficiently excited by pumping and energy transfer (ET) to and ions. The enhanced emission has a maximum emission cross section (). An ET mechanism based on the enhanced 2.0 μm emission and other reduced near-infrared emissions is discussed. Results show that the addition of ions populates the level through the channel at the level between and ions. The spectroscopic characteristics and thermal property of tri-doped ZBYA glass reveal that the material is an attractive host for 2.0 μm lasers.
© 2015 Optical Society of America
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