Energy transfer and 1.8μm emission in Tm3+/Yb3+ codoped lanthanum tungsten tellurite glasses

Li, Kefeng; Zhang, Qiang; Bai, Guangfu; Fan, Shuzhen; Zhang, Junjie; Hu, Lili

doi:10.1016/j.jallcom.2010.05.162

Cited by 55 publications

(15 citation statements)

References 32 publications

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“…It is well know that˝2 is the most sensitive to the covalent bonding [23], so we can reasonable deduce that the covalent degree of the present BGN is stronger than fluoride and tellurite glasses. On the other hand, the˝4/˝6 determines the spectroscopy quality of the host materials [27], it is clear that the present BGN glass has a value of˝4/˝6 comparable with other glasses listed in Table 1, which suggests that BGN glass is a good matrix for infrared emission. Fig.…”

Section: The Absorption/ir Transmittance Spectra and Judd-ofelt Analysissupporting

confidence: 64%

Broadband near-infrared emission in Er3+–Tm3+ co-doped bismuthate glasses

Fan

Zhang

et al. 2011

Journal of Alloys and Compounds

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Section: The Absorption/ir Transmittance Spectra and Judd-ofelt Analysissupporting

confidence: 64%

Broadband near-infrared emission in Er3+–Tm3+ co-doped bismuthate glasses

Fan

Zhang

et al. 2011

Journal of Alloys and Compounds

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“…The small absorption band around 3 250 cm −1 is assigned to the stretching vibration of free OH − groups. Its absorption coefficient α OH is 0.46 cm −1 , which is lower than those of other reports [11,16] . The good infrared transmission of this bismuth germanate glass will benefit its spectroscopic properties in MIR range.…”

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confidence: 67%

Ef f icient 2.7-\mu m emission in Er3+-doped bismuth germanate glass pumped by 980-nm laser diode

et al. 2012

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An Er3+ -doped lead-free bismuth germanate glass is synthesized. Its 2.7-µm emission property is analyzed, and the efficient 2.7-µm emission from the glass is observed under 980-nm laser diode excitation. The prepared glass possesses high spontaneous transition probability (64.8 s −1 ) and a large calculated emission cross section (6.61×10 −21 cm 2 ) corresponding to the 4 I 11/2 → 4 I 13/2 transition. The multiphonon relaxation rate for the excited state 4 I 11/2 is only 236 s −1 . Therefore, the excellent spectroscopic properties and outstanding thermal stability suggest that this glass is a suitable host for developing solid-state lasers operating in the mid-infrared.OCIS codes: 160.2750, 160.4760, 160.5690. doi: 10.3788/COL201210.091601.Over the past several decades, compact solid-state lasers operating in the wavelength region around 2.7 µm have been actively developed because of their applicability in various fields, such as remote sensing, atmosphere pollution monitoring, eye-safe laser radar, and medical surgery [1−4] . Much effort has been directed to the search for new laser materials in the mid-infrared (MIR) range. Host glass and active ion are two important factors in achieving efficient and high-quality optical devices based on rare-earth ions. Er 3+ -doped non-oxide glass (such as fluoride and chalcogenide glasses), which is a compact and efficient source of 2.7-µm radiation, has been researched extensively [5−9] . However, fluoride and chalcogenide glasses have fussy preparation processes and poor thermal stability, chemical durability, and physical and mechanical performance. These disadvantages restrain their wider application in 2.7-µm fibers [10] . Therefore, MIR laser materials from oxide glass are necessary.To improve the emission feature of the Er 3+ : 4 I 11/2 excited state, the oxide glass host should have low phonon energy. Among various oxide glasses, bismuth glass shows many significant advantages over other oxide glasses in terms of the fluorescent properties of rare earth. A previous study has shown that bismuth glass has significantly lower phonon energy (MPE of ∼440 nm −1 ) than germanate and tellurite glasses. This property is helpful in reducing the multiphonon relaxation rate for Er 3+ : 4 I 11/2 → 4 I 13/2 transition [11] . The large refractive index (∼2.1) is favorable for obtaining large absorption and emission cross sections. Moreover, bismuth glass exhibits better thermal stability and chemical durability than fluoride and chalcogenide glasses. These characteristics make bismuth glass a suitable host for MIR solidstate lasers. This work aims to investigate the spectroscopic performance of 2.7-µm emission in Er 3+ -doped bismuth glass, as well as the radiative properties and emission cross section.The investigated host bismuth glass had the following composition in cation%: 55BiO 1.5 -30 GeO 2 -15NaO 0.5 (BGNE). The single doping concentration of Er 3+ in the form of ErF 3 was 2 mol%. Using ErF 3 will induce a positive effect on MIR emission properties of rare earth (RE) ...

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“…The peak values of absorption and emission cross-sections are 1.941 Â 10 À20 and 1.852 Â 10 À20 cm 2 at 976 and 977 nm wavelengths, respectively. And the large cross-section profiles of Yb 3+ are beneficial in absorbing sufficient pump energy and transferring energy to Tm 3+ ions in co-doped LYAS glass system [47].…”

Section: Resultsmentioning

confidence: 99%