Abstract

In the present Letter, a high-emission intensity of 2.0 μm is reported for Ho3+/Er3+ co-doped fluoride glass sensitized by Tm3+ ions under 1550 nm excitation. The measured absorption spectra do not show clustering in the local ligand field, which also demonstrates that Er3+ ions are efficiently excited by pumping and energy transfer (ET) to Ho3+ and Tm3+ ions. The enhanced Ho3+:2.0μm emission has a maximum emission cross section (4.8×1021cm2). 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 Tm3+ ions populates the Ho3+:I75 level through the channel at the Tm3+:F43 level between Er3+ and Ho3+ ions. The spectroscopic characteristics and thermal property of Er3+/Ho3+/Tm3+ 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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