Fluoride glass research in France: fundamentals and applications

Optical transitions and upconversion mechanisms in Er3+-doped heavy metal oxyfluoride germanate glass

“…Layne et al [34] have discussed the multiphonon relaxation of rare-earth ions in oxide glasses. The approximate frequencies of the high-energy phonons in each glass are: borate, 1350 cm −1 ; phosphate, 1100 cm −1 ; silicate, 1000 cm −1 ; germanate, 900 cm −1 ; tellurite, 800 cm −1 ; fluoride, 350-500 cm −1 [33,35] glasses. From the above result we can deduce that fluoride ions have an important influence on the formation of glass network.…”

Rare-Earth-Activated Fluorophosphate Glasses: Local Environment of the Activator and Capture Volume Model

“…The great interest in rare-earth-activated fluoride and fluorophosphate glasses is motivated by the new possibilities that are offered by these materials for midand near-IR optical fiber communication systems [1,2]. Since the spectroscopic properties of rare-earth ions depend on their local environment, many attempts have been made to date to study the nearest neighbor environment of rare-earth activators in phosphate, fluorophosphate, and fluoroaluminate hosts [3][4][5].…”

A model of the capture volume of free carriers in fluorophosphate glasses doped with terbium

“…In our opinion, investigation into the properties of fluorophosphate and fluoride glasses doped with rare-earth ions holds the greatest interest today. This is associated with the unique spectroscopic properties exhibited by rare-earth ions in these matrices (specifically with the high efficiency of excitation energy transfer from Yb 3+ ions to Er 3+ ions as compared to silicate and borate matrices [6,7]), on the one hand, and with the low energy of phonons in the fluoride matrix (which makes it promising for use in fabricating fibers with low losses in the IR range [1,2]), on the other hand.…”

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INTRODUCTIONThe particular interest expressed by researchers in the study of the behavior of rare-earth ions in glassforming matrices has stemmed, to a large extent, from new possibilities offered by optical fiber amplifiers based on Er 3+ , Pr 3+ , and Nd 3+ ions [1,2]. Until recently, many attempts have been made to elucidate the nearest environment of dopant ions and to determine their spatial distribution in different matrices [3][4][5].

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“…(1) EPR spectrum of the irradiated glass of the secDependences of the intensity of the EPR absorption signals from(1,2,3) and (1', 2', 3') paramagnetic centers on the dopant concentration C 3 in glasses of (1, 1') the first, (2, 2') second, and (3, 3') third series. Solid lines indicate the experimental data, and dashed lines correspond to the results of calculations according to expression(3).…”