Triple-wavelength lasing at 1.50 µm, 1.84 µm and 2.08 µm in a Ho³⁺/Tm³⁺ co-doped fluorozirconate glass microsphere

Zhao, H., Yi, Y., Wang, X., Li, A., Yang, A., Yang, Z., Fan, Y., Jia, S., Lewis, E., Brambilla, G., Wang, S. and Wang, P. (2020) Triple-wavelength lasing at 1.50 µm, 1.84 µm and 2.08 µm in a Ho³⁺/Tm³⁺ co-doped fluorozirconate glass microsphere. Journal of Luminescence, 219, [116889]. (doi:10.1016/j.jlumin.2019.116889).

Abstract

Simultaneous 1.50 µm, 1.84 µm and 2.08 µm laser emission is observed in a Ho³⁺/Tm³⁺ co-doped ZrF₄–BaF₂–YF₃–AlF₃ (ZBYA) fluoride glass microsphere when pumped using a 793 nm laser diode. The ZBYA fluoride glass microsphere was prepared using a CO₂ laser heating method and whispering-gallery modes (WGM) were excited when the pump light was coupled using a tapered fiber. The introduction of Ho³⁺ ions reduced the population of the long-lived Tm³⁺:³F₄ level and removed the ³H₄ - ³F₄ self-termination effect, resulting in the population of the Ho³⁺:⁵I₇ level through a resonant energy transfer process. As the 793 nm laser pump power grows, lasing occurs initially at 2.08 µm, followed by the cascade outputs at 1.50 µm and 1.84 µm.

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Contributors

Author: G. Brambilla

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