Upconversion Lasers

Lenth, W.; Macfarlane, R. M.

doi:10.1364/opn.3.3.000008

Cited by 122 publications

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“…Furthermore, they have high thermal conductivity, hardness, and chemical stability [9]. Also, they are interesting for upconversion phenomena: the generation of visible or UV light from lower energy radiation, usually NIR or IR, through the use of transition metal, lanthanide or actinide ions doping a solid state host [10,11]. All rare earth ions have demonstrated upconversion and are particularly suited to undergo this process as they show several excited states with long lifetimes that are well matched to the emission wavelengths of several efficient pump laser sources.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Krsmanović¹,

Polizzi²,

Canton³

2005

Materials Science Forum

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Abstract. In the present work we study the nanocrystalline powders of lanthanide-doped Gd 3 Ga 5 O 12 (GGG, gadolinium gallium garnet) prepared using propellant synthesis. A series of GGG samples containing a number of different trivalent lanthanide ions (Tm, Er, Ho, Eu, Sm, Nd, and Pr) in different quantities (1%, 5%, 10%) were produced. Samples were characterized by X-ray diffraction (pre-and post calcination) for phase identification and line-broadening analysis, and by electron microscopy (SEM and TEM) for morphological and nanostructural investigation. Thermal behavior of the powder was investigated by thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). The samples have a polycrystalline porous structure. Elemental microanalysis made by energy dispersive X-ray spectroscopy (EDX) detector attached to TEM and XRD unit-cell determinations confirmed that the lanthanides ions entered the structure of GGG. Crystallites have a high degree of disorder.

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Section: Introductionmentioning

confidence: 99%

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Krsmanović¹,

Polizzi²,

Canton³

2005

Materials Science Forum

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“…These potential applications are in the areas of lighting, lasers, displays, and imaging systems as well as NIR photon counters. [3][4][5] Most of this work is based on lanthanide-doped crystals and glasses. f-f excited states of lanthanides are often metastable because of the shielding of the f-electrons and the resulting small electron-phonon coupling.…”

Section: Introductionmentioning

confidence: 99%

Exchange-Induced Upconversion in Rb₂MnCl₄:Yb³⁺

2002

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Crystals of Yb 3+ doped Rb 2 MnCl 4 exhibit very intense yellow-orange Mn 2+ 4 T 1g f 6 A 1g upconversion luminescence under near-infrared 2 F 7/2 f 2 F 5/2 Yb 3+ excitation around 1 µm at 15 K. Excitation with 10 ns pulses indicates that the upconversion process consists of a sequence of ground-state and excited-state absorption steps. The upconversion mechanism is cooperative, involving both Yb 3+ and Mn 2+ ions in the crystal, and we postulate an exchange mechanism between adjacent Yb 3+ and Mn 2+ ions to account for the unusually high efficiency of the process. The efficiency of the upconversion process is dependent on the nature of the Yb 3+ -Mn 2+ connectivity. The upconversion in Rb 2 MnCl 4 :Yb 3+ , with a linear Yb 3+ -Cl --Mn 2+ arrangement, is 3 orders of magnitude more efficient than in the Yb 3+ -(Br -) 3 -Mn 2+ arrangement of face-sharing octahedra in CsMnBr 3 :Yb 3+ .

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“…These glasses show wide transmission in the 0.4-5.0-μm range, high linear and nonlinear refractive index, good corrosion resistance, thermal and chemical stability, and they are capable of incorporating large concentrations of rare earth ions into the matrix [27,28]. Tellurite glasses represent a compromise between the desire for a low phonon energy host (800cm -1 ) coupled with the need to retain mechanical strength and low-processing temperatures [29].…”

Section: Results Of the Photoacoustic And Photoluminescence Spectra Omentioning

confidence: 99%

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

Cornejo¹

2016

Luminescence - An Outlook on the Phenomena and Their Applications

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This chapter focuses on the study on luminescent materials, which consist of oxide compounds (host material) and rare earth ions (as the activator) in the valence state, mostly 3+. The first part begins with a background study about the luminescence phenomenon, its stages, and the configurational coordinate diagram. Then, we review the notation often used for rare earth ions, such as the term symbols associated with the energy levels of the ground state. Lastly on the first part, we establish a relationship between the configurational coordinate model and the electronic transitions of such ions. The second part shows the photoluminescence results in some oxide compound materials doped with rare earth ions that have been reported in research articles with potential applications.

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Upconversion Lasers

Cited by 122 publications

References 0 publications

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Exchange-Induced Upconversion in Rb₂MnCl₄:Yb³⁺

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

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Upconversion Lasers

Cited by 122 publications

References 0 publications

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Exchange-Induced Upconversion in Rb2MnCl4:Yb3+

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

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Exchange-Induced Upconversion in Rb₂MnCl₄:Yb³⁺