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23 results on '"Lai, Shengying"'

15. 3.1 μm mid-infrared luminescence in Er3+doped ZnF2modified aluminum fluoride glass

Author

Zhang, Chuncheng, Zhang, Chaomin, Yun, Chao, and Lai, Shengying

Abstract

Herein, melt-quenching and Er3+doping were used to synthesize fluoride glass specimens with low phonon energies (582 cm−1). These glass specimens exhibit intense 3.1 μm mid-infrared band emission when they are excited by a 980 nm laser diode, achieving a full width at half maximum (FWHM) of about 166 nm. This 3.1 μm emission intensity is enhanced by the introduction of ZnF2to the AlF3-based fluoride glass. Up-conversion emission, strong near-infrared emission, and fluorescence lifetime are enhanced to different degrees by increasing the ZnF2content. Moreover, the spectroscopic characteristics of the glass specimens and the highly efficient Er3+: 4S3/2 → 4F9/2transition's energy transfer mechanism were investigated. The absorption spectra and emission spectra of these aluminum fluoride glass specimens were used to calculate their gain coefficients and maximum cross sections at 1.5 and 3.1 μm. Overall, the spectral properties of these prepared aluminum fluoride glass specimens demonstrate their high potential for use as infrared laser host materials.

Published
2023
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18. Effective improvement of 2.0-µm and 4.1-µm mid-infrared emission in Tm3+/Ho3+-co-doped tellurite glasses.

Author

Zhang, Chuncheng, Zhang, Chaomin, and Lai, Shengying

Subjects
GLASS, X-ray diffractometers, THERMAL stability, FLUORESCENCE, ENERGY transfer, PHOTOLUMINESCENCE
Abstract

Tm3+/Ho3+-co-doped tellurite glasses were fabricated by employing the high-temperature melting technology to achieve intense mid-infrared emission. X-ray diffractometer (XRD) figure proved the amorphous structure of the prepared specimens. The measured parameter ΔT (136 °C) > 120 °C indicates that the prepared tellurite glass specimen held the better thermal stability and crystallization resistance. By the 808-nm LD pumping, intense 1.8-µm fluorescence were obtained in Tm3+-single-doped tellurite glasses and strong 2.0-µm and 4.1-µm mid-infrared emission were also obtained in Tm3+/Ho3+-co-doped tellurite glasses, besides broadband mid-infrared fluorescence intensity was evidently enhanced with the appropriate Ho3+ concentration. For further research mid-infrared fluorescence properties of the prepared glasses, the energy transfer process between Ho3+ and Tm3+ ions were in detail discussed according to the suppression and enhancement of the fluorescence intensity under the different Ho3+ ion-doped concentration. Results indicated that the Tm3+/Ho3+-co-doped tellurite glasses had brilliant fluorescence performance, which might be ideal host material for ultra-broadband mid-infrared laser. [ABSTRACT FROM AUTHOR]

Published
2022
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