Control of nonlinear absorption and amplification of light in Er^3+-doped fluoroindate glass

Maciel, Glauco S.; Rakov, Nikifor; Araújo, Cid B. de; Messaddeq, Younès

doi:10.1364/josab.16.001995

Cited by 9 publications

(5 citation statements)

References 22 publications

(20 reference statements)

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“…The results demonstrate the large potential of FIG for photonic applications such as upconverters, lasers, optical amplifiers and thermal sensors. For example, we have demonstrated the potential of Nd 3+ -doped FIG for blue lasing [39], and Er 3+ -doped FIG for temperature sensing [40] and optical modulation [41]. Other authors demonstrate the use of FIG as laser host [42,43].…”

Section: Introductionmentioning

confidence: 93%

Frequency upconversion in rare-earth doped fluoroindate glasses

Araújo

Maciel

Menezes

et al. 2002

Comptes Rendus. Chimie

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We present recent results on frequency upconversion (UPC) obtained in fluoroindate glasses (FIG) doped with Ho 3+ , Tm 3+ and Nd 3+ ions and codoped with Pr 3+ /Nd 3+ and Yb 3+ /Tb 3+ ions. The results for the Ho 3+ -doped samples show strong evidence of energy transfer (ET) between Ho 3+ ions resonantly excited at 640 nm. The origin of the blue-green upconverted fluorescence observed was identified and the dynamics of the signals revealed the pathways involved in the UPC process. In the case of Tm 3+ -doped FIG, the samples were resonantly excited at 650 nm and the main mechanism that contributes for the red-to-blue upconversion is excited-state absorption (ESA). The FIG samples codoped with Pr 3+ /Nd 3+ were excited at 588 nm in resonance with transitions starting from the ground state of the Nd 3+ and the Pr 3+ ions. It was observed that the presence of Nd 3+ ions enhanced the Pr 3+ emission at 480 nm by two orders of magnitude. Multiphonon (MP)-assisted upconversion is also discussed for Nd 3+ -doped FIG pumped at 866 nm. Emission at 750 nm with a peculiar linear dependence with the laser intensity was observed and explained. A rate-equation model that includes MP absorption via thermally coupled electronic excited states of Nd 3+ was developed and describes well the experimental results. The role played by effective phonon modes is clearly demonstrated. MP-assisted UPC process was also studied in Yb 3+ /Tb 3+ -codoped FIG samples excited at 1064 nm, which is off-resonance with electronic transitions starting from the ground state. It was determined that the mechanism leading to Tb 3+ emission in the blue is due to ET from a pair of excited Yb 3+ ions followed by ESA in the Tb 3+ ions. To cite this article: Cid B. de Araújo et al., C. R. Chimie 5 (2002) 885-898 © 2002 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS frequency upconversion / fluoroindate glass / rare-earth ionsRésumé -Des résultats récents relatifs à la conversion ascendante de fréquence dans le verre fluoroindate (FIG) dopé avec ions Ho 3+ , Tm 3+ et Nd 3+ ou codopé avec Pr 3+/ Nd 3+ et Yb 3+ /Tb 3+ sont présentés. Les expériences réalisées sur Ho 3+ mettent clairement en évidence un transfert d'énergie entre les ions Ho 3+ excités à la longueur d'onde 640 nm. L'origine des fluorescences bleue et verte a été identifiée ; la dynamique des signaux permet de mettre en évidence les chemins d'excitation dans les processus de conversion ascendants. Les échantillons contenant Tm 3+ étaient excités par un laser émettant à 650 nm : le processus dominant pour la conversion ascendante rouge-bleu est l'absorption, pour les états excités d'un même ion. Les verres codopés Pr 3+ /Nd 3+ étaient excités à 588 nm. La présence du Nd 3+ a augmenté l'émission à 480 nm par le Pr 3+ de deux ordres de grandeur. L'émission visible assistée par un processus de multiphonons est présentée pour Nd 3+ pompé à 866 nm. Une émission à 750 nm avec dépendance linéaire en puissance de pompage a aussi été observée et expliquée. Un modèle faisant interveni...

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Section: Introductionmentioning

confidence: 93%

Frequency upconversion in rare-earth doped fluoroindate glasses

Araújo

Maciel

Menezes

et al. 2002

Comptes Rendus. Chimie

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“…We choose a proper energy gap, which is at least 5 000 cm −1 . Furthermore, there is an appropriate energy gap in Ho 3+ or Er 3+ [15] or Dy 3+ ions, which may be used to realize the laser cooling of new solid materials [16,17] . In addition, the cooling power is calculated.…”

Section: -3mentioning

confidence: 99%

Mechanism of refrigeration cycle on laser cooling of solids

You-Hua¹,

Zhong²,

Yin³

2012

中国光学快报

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A simple model is developed to study the laser cooling of solids. The condition of laser cooling of a solid is developed. By using some parameters of the Yb 3+ ion, which is most widely used in laser cooling, we then calculate the cooling power and the cooling efficiency. In order to make a more precise analysis, the effect of fluorescent reabsorption, which is unavoidable in the cooling process, is discussed using the random walk model. Taking Tm 3+ ion as an example, we derive the average number of absorption events and determine the change in quantum efficiency due to reabsorption. Finally, we obtain the red-shift of the fluorescent wavelength and the requirement of sample dimension.OCIS codes: 140.3320, 160.2540, 300.2530. doi: 10.3788/COL201210.031401.As early as 1929, Pringsheim proposed an idea to cool a solid material by using anti-Stokes fluorescence. In this process, the material absorbs a pumping photon with a longer wavelength and soon afterwards emits a fluorescence photon with a shorter wavelength; the energy difference between the two photons, which results from the internal energy of the material, is removed by the fluorescence radiation, and the material is cooled. Many researchers have initially opposed this idea as they cannot relate laser to refrigeration. However, in 1995, the first demonstration of net laser cooling of a solid was reported [1] , and a Yb 3+ -doped fluorozirconate glass ZBLANP was cooled to 0.3 K below room temperature. Thereafter, people have carried out a series of theoretical and experimental studies for laser cooling of solids and obtained great progress [2−12] . Since anti-Stokes fluorescence cooling has been successfully achieved, explanations about the experimental result have been continually explored. Lamouche et al. found a theoretical model [12] and derived the cooling efficiency in arbitrary temperature by evaluating the experimental spectroscopy. The relationship between the mean fluorescent wavelength and the temperature was also determined. As the model of Lamouche is very complex, we propose a simple two-level system to analyze the micro course of laser cooling and then calculate the cooling power and cooling efficiency. We then discuss several main parameters that influence cooling power and determine the relationship between temperature and time.In order to obtain efficient laser cooling of solids, the key is to choose the proper fluorescent center and its level structure, as well as the appropriate energy gap. Taking Tm 3+ ions as example, their energy manifolds are shown in Fig.

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“…Rare earth-doped fluoride glasses are desirable materials for upconversion lasers, optical amplification and display devices due to their low phonon energy environment for rare earth (RE) ions [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Influence of structural evolution on fluorescence properties of transparent glass ceramics containing LaF3 nanocrystals

Wang

et al. 2006

Journal of Luminescence

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Control of nonlinear absorption and amplification of light in Er^3+-doped fluoroindate glass

Cited by 9 publications

References 22 publications

Frequency upconversion in rare-earth doped fluoroindate glasses

Frequency upconversion in rare-earth doped fluoroindate glasses

Mechanism of refrigeration cycle on laser cooling of solids

Influence of structural evolution on fluorescence properties of transparent glass ceramics containing LaF3 nanocrystals

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