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The Sm 3+ doped SrO-Nb 2 O 5 -Al 2 O 3 -Ga 2 O 3 -SiO 2 glasses in this work were prepared using the conventional melt quenching method. The effects of Al 2 O 3 /Ga 2 O 3 ratio on the structure and orange light emission properties were studied by XRD, Raman spectroscopy, spectrophotometer and J-O theory, respectively. With the increase of Al 2 O 3 content, the absorption coefficient of the glass sample gradually increases, which might be attributed to an increase in non-bridged oxygen bonds caused by a change in the glass network structure. Under 403 nm excitation, the emission spectra show clear peaks at 602 nm and 649 nm, representing the 4 G 5/2  →  6 H 7/2 , and 4 G 5/2  →  6 H 9/2 transitions, respectively. When the Al 2 O 3 /Ga 2 O 3 ratio is 0.25, the sample luminescence intensity is the highest, and the emission cross section of A2 glass sample is 4.34 × 10 -22  cm 2 . The CIE color coordinates, color purity, and color temperature values of all samples were determined, and they were all located in the orange-red light region. The experiments results reveal that the prepared silica-aluminum-gallium glasses has a potential application prospect in orange-red LEDs, solid state lasers and other fields., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Er 3+ -doped glasses and fibers with broadband near infrared (NIR) emission have been widely applied in EDFA. Limited by optical gain band of Er 3+ -doped glasses and fibers, it was hardly meet to the demands of broadband amplification in the C + L band. In this work, six glass matrixes were employed for discussing the influence of glass matrix on the Stark splitting of Er 3+ and the wavelength of laser output and amplification. The larger scalar crystal-field parameter N J induce larger Stark splitting of Er 3+ -doped tellurite, germanate, and fluorophosphate glasses, which resulted in larger Δλ eff . The Stark splitting of Er 3+ -doped tellurite, germanate, silicate, and phosphate glasses was mainly derived from homogeneous broadening, which be favor to obtain longer wavelength amplification and laser output. While that of Er 3+ -doped fluorophosphate and aluminate glasses was mainly derived from the inhomogeneous broadening, the amplification and laser output of Er 3+ tend to operate in the shorter wavelength., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

The YAG single crystals doped with 10 at.%, 20 at.% and 50 at.% Er 3+ were successfully grown by the micro-pulling down method and spectroscopic properties of the crystals were investigated. The main interest was focus on the relation between the Er 3+ concentration and ∼3.5 μm emission of Er 3+ :YAG crystals. Room temperature absorption spectra were analyzed by the Judd-Ofelt theory. The stimulated emission cross-sections were calculated by the Füchtbauer-Ladenburg equation. The fluorescence intensities and peak emission cross-sections of the crystals at ∼3.5 μm are slightly decreasing with the increase of Er 3+ concentration. The trend of the emission properties in NIR and visible region with the Er 3+ concentration was also discussed and compared. The results indicate that the highly doped Er 3+ concentration is beneficial to realize the ∼3.5 µm laser output., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021. Published by Elsevier B.V.)