Spectroscopic and lasing performance of Tm^3+-doped bulk TZN and TZNG tellurite glasses operating around 19 μm

Fusari, F.; Lagatsky, A.A.; Richards, Billy; Jha, A.; Sibbett, W.; Brown, C.T.A.

doi:10.1364/oe.16.019146

Cited by 39 publications

(27 citation statements)

References 16 publications

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“…(10) and (11), the values of the peak absorption and emission cross-sections for BGN-1-6 samples decrease gradually with increasing Tm 3+ concentration. [18], tellurite [26] and germanate glasses [27], but is smaller than phosphate [28], ZBLAN [19,29] glasses, and oxyfluoride glass-ceramics [30]. The large value of r e Â s R indicates that the BGN glass is promising material for optical amplification.…”

Section: Absorption and Stimulated Emission Cross-sectionmentioning

confidence: 99%

Tm3+ doped Bi2O3–GeO2–Na2O glasses for 1.8μm fluorescence

et al. 2010

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Section: Absorption and Stimulated Emission Cross-sectionmentioning

confidence: 99%

Tm3+ doped Bi2O3–GeO2–Na2O glasses for 1.8μm fluorescence

et al. 2010

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“…Recently, lasing and mode-locked operation from bulk thulium-doped tellurite glasses were reported [20,[26][27][28]. Since Tm 3+ -doped tellurite glasses offer a great potential for the development of 2-µm laser sources in bulk as well as fiber configurations, there is interest in further exploring the spectroscopic properties of the tellurite glass hosts doped with thulium.…”

Section: Introductionmentioning

confidence: 99%

Comparative Spectroscopic Investigation of Tm3+:Tellurite Glasses for 2-μm Lasing Applications

et al. 2018

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Abstract:We performed a comparative spectroscopic analysis on three novel Tm 3+ :tellurite-based glasses with the following compositions Tm 2 O 3 :TeO 2 -ZnO (TeZnTm), Tm 2 O 3 :TeO 2 -Nb 2 O 5 (TeNbTm), and Tm 3+ :TeO 2 -K 2 O-Nb 2 O 5 (TeNbKTm), primarily for 2-µm laser applications. Tellurite glasses were prepared at different doping concentrations in order to investigate the effect of Tm 3+ ion concentration as well as host composition on the stimulated emission cross sections and the luminescence quantum efficiencies. By performing Judd-Ofelt analysis, we determined the average radiative lifetimes of the 3 H 4 level to be 2.55 ± 0.07 ms, 2.76 ± 0.03 ms and 2.57 ± 0.20 ms for the TeZnTm, TeNbTm and TeNbKTm samples, respectively. We clearly observed the effect of the cross-relaxation, which becomes significant at higher Tm 2 O 3 concentrations, leading to the quenching of 1460-nm emission and enhancement of 1860-nm emission. Furthermore, with increasing Tm 2 O 3 concentrations, we observed a decrease in the fluorescence lifetimes as a result of the onset of non-radiative decay. For the 3 H 4 level, the highest obtained quantum efficiency was 32% for the samples with the lowest Tm 2 O 3 ion concentration. For the 1860-nm emission band, the average emission cross section was determined to measure around 6.33 ± 0.34 × 10 −21 cm 2 , revealing the potential of thulium-doped tellurite gain media for 2-µm laser applications in bulk and fiber configurations.

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“…The opportunity to access the mid-IR range using GeS2-based glass optical fibres is quite tempting which might open much greater potential for using 2µm CW and mode-locked lasers [6], and the lasers based on Dy 3+ [7] and Pr 3+ [8] doped fluoride, fluoro-tellurite and chalcogenide glasses. By integrating a rare-earth ion doped laser device, for example, with a passive chalcogenide optical fibres and waveguides [9] and mid-IR detectors will aid the development of sensors and imaging system in mid-IR.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of low-OH GeS<inf>2</inf> glasses and multimode fibres for mid-IR applications

Hill

Jha

2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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The fabrication properties of ternary and quaternary GeS2-based chalcogenide glasses are discussed in view of the removal impurities and control of crystallization by controlling the starting composition, raw materials purification and fabrication steps. The two specific compositions discussed for glass and fibre fabrication are: GeS2-Ga 2S3-Cs I and GeS2-Ga 2S3-Cs I-SnS which were optimised for multimode fibre fabrication by investigating the thermal and viscosity properties. For chemical process control in food, pharmaceutical and petrochemical industry, optical fibre sensors operating above 200 o C in chemical process environment are required. For food and pharmaceutical it is also safer to use materials which are non-toxic. With these aims in mind we focussed on designing the glass structure by raising the Tg from 350 o C in ternary glass composition to 450 o C. By modifying the glass structure with the addition of SnS, the probability of near-Tg and sub-Tg structural relaxation in optical fibres, derived from quaternary compositions.For the analysis of structural modification in glass, we have systematically carried out Raman spectroscopy using 514 and 633 nm sources. We report changes in the structure as a function of composition. The Raman spectroscopic analysis is also complemented by the IR reflection and transmission spectroscopy for a more comprehensive characterisation the vibrational structures. The glass compositions were also analysed for their devitrification and near Tg relaxation behaviour. On the basis of the devitrification characteristics we have also characterised the thermal stabilities of various compositions under thermal cyclic loading in the transformation region. Th e structural relaxation behaviour above Tg was also characterised by using a differential mechanical analyser by measuring the viscosity. INTRODUCTIONGermanium disulphide (GeS2) based glasses are modelled on the structure of [SiO4] 4-structure in silicates. The main structural building block is [GeS4] 4-tetrahedron unit which forms the 3D-random network. In such a structure, the cation-anion bond length (R,Å) due to Ge 4+ (0.53Å)-S 2-(1.84Å) pair (2.37Å) is larger than that in [SiO4] 4-(R= 1.74Å). The glass formation ability and composition in GeS2 system has been very well known, as an extended IR material. However, little is known about the glass-forming system for fibre fabrication and its transmission properties. The larger bond length and lower value of electronegativity of sulphur atoms than that for oxygen in [SiO4] 4-and heavier Ge and S atoms than Si and O, makes GeS2 based glass an ideal material for engineering extended mid -IR fibres. The structural approach, discussed above, is consistent with the linear harmonic oscillator model equation 1 for calculating the fundamental frequency (o) of molecular vibration and estimation of IR absorption edge. In equation 1:

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Spectroscopic and lasing performance of Tm^3+-doped bulk TZN and TZNG tellurite glasses operating around 19 μm

Cited by 39 publications

References 16 publications

Tm3+ doped Bi2O3–GeO2–Na2O glasses for 1.8μm fluorescence

Tm3+ doped Bi2O3–GeO2–Na2O glasses for 1.8μm fluorescence

Comparative Spectroscopic Investigation of Tm3+:Tellurite Glasses for 2-μm Lasing Applications

Fabrication of low-OH GeS<inf>2</inf> glasses and multimode fibres for mid-IR applications

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