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Enhanced 2.7- and 2.84-μm emissions from diode-pumped Ho3+/Er3+-doped fluoride glass

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Abstract

This work reports the intense emissions at 2.7 and 2.84 μm in a Ho3+/Er3+-codoped fluoride glass (ZrF4-BaF2-YF3-AlF3). An extensive transmission spectrum and the absence of strong OH absorption guarantee the observation of mid-infrared (IR) emissions. For the Ho3+/Er3+-codoped sample, the 2.7- and 2.84-μm emissions are 5.8 and 3.8 times higher with larger emission cross-sections (10.2×1021 and 9.8×1021cm2), respectively. Meanwhile, other near to middle infrared emissions (1200, 2045 nm emissions from Ho3+ and 980, and 1535 nm emissions from Er3+ ions) are all enhanced. The collective enhanced effect originates from the disappearance of nonradiative decay processes after codping Er3+ and Ho3+ ions. Hence, the advantageous spectroscopic characteristics of Ho3+/Er3+-codoped ZBYA glass indicate that this kind of fluoride glass may be an attractive host to develop solid-state lasers for 3 μm.

© 2014 Optical Society of America

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