Role of pump duration on temperature and efficiency of up-conversion in fluoride crystals co-doped with ytterbium and thulium

Rapaport, Alexandra; Milliez, Janet; Bass, Michael; Cassanho, A.; Jenssen, H. P.

doi:10.1364/opex.12.005215

Cited by 17 publications

(9 citation statements)

References 12 publications

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“…The upconversion mechanism was by photon avalanche. [8][9][10][11][12] In this paper, YLF doped with thulium ͑Tm 3+ ͒ ions that are sensitized by neodymium ͑Nd 3+ ͒ and ytterbium ͑Yb 3+ ͒ was studied, and the multiples processes of energy transfer that occurs when this material is excited around 800 and near 960 nm were inspected, and the transfer rates constants were determined. In light of potential directly diode pumped Tm 3+ -doped YLF:Yb:Nd crystal lasers, we numerically solved the rate equations for Yb͑20 mol %͒ : Tm͑0.5 mol %͒ : YLF and Yb͑20 mol %͒ :Nd͑1 mol %͒ : Tm͑0.5 mol %͒ : YLF crystals under cw pumping at 797 nm to determine the population inversion and its dependence on the Nd 3+ codoping.…”

Section: Crystal I Introductionmentioning

confidence: 99%

Population inversion of G14 excited state of Tm3+ investigated by means of numerical solutions of the rate equations system in Yb:Tm:Nd:LiYF4 crystal

Librantz

Gomes

Courrol

et al. 2009

Journal of Applied Physics

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Energy transfer rates and population inversion of I 4 11 / 2 excited state of Er 3 + investigated by means of numerical solutions of the rate equations system in Er : LiYF 4 crystal In this work we present the spectroscopic properties of LiYF 4 ͑YLF͒ single crystals activated with thulium and codoped with ytterbium and neodymium ions. The most important processes that lead to the thulium upconversion emissions in the blue region were identified. A time-resolved luminescence spectroscopy technique was employed to measure the luminescence decays and to determine the most important mechanisms involved in the upconversion process that populates 1 G 4 ͑Tm 3+ ͒ excited state. Analysis of the energy transfer processes dynamics using selective pulsed laser excitations in Yb:Tm:Nd, Tm:Nd, and Tm:Yb YLF crystals shows that the energy transfer from Nd 3+ to Yb 3+ ions is the mechanism responsible for the enhancement in the blue upconversion efficiency in the Yb:Tm:Nd:YLF when compared with the Yb:Tm system. A study of the energy transfer processes in YLF:Yb:Tm:Nd crystal showed that the 1 G 4 excited level is mainly populated by a sequence of two nonradiative energy transfers that start well after the Nd 3+ and Tm 3+ excitations at 797 nm according to NdResults of numerical simulation of the rate equations system showed that a population inversion for 481.4 nm laser emission line is attained for a pumping rate threshold of 26 s −1 , which is equivalent to an intensity of 880 W cm −2 for a continuous laser pumping at 797 nm. On the other hand, a population inversion was not observed for the case of 960 nm ͑Yb 3+ ͒ pumping.

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Section: Crystal I Introductionmentioning

confidence: 99%

Population inversion of G14 excited state of Tm3+ investigated by means of numerical solutions of the rate equations system in Yb:Tm:Nd:LiYF4 crystal

Librantz

Gomes

Courrol

et al. 2009

Journal of Applied Physics

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“…Additionally, bright blue up conversion emission through sensitization of thulium ions in lead and cadmium germanate glass triply doped with Nd-Tm-Yb under excitation around 800 nm demonstrated that for the same excitation power, the triply -cooped sample generated ten times more 475 nm blue up conversion fluorescence than the Yb 3+ -sensitized Tm 3+ -doped samples 10 . YLiF 4 (YLF) crystals doped with thulium (Tm 3+ ) and also co-doped with ytterbium (Yb 3+ ) 11,12 are well-known as active media that generate stimulated radiation on a number of lines over a wide spectral range from 450 nm to 2350 nm, upon selective laser, laser diode, and flash lamp pumping 13,14,15,16 .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of blue thulium emission on Nd:Yb:Tm-doped YLF crystals

et al. 2006

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In this paper we present the spectroscopic properties of YLF:Yb:Tm:Nd system identifying the most important processes that lead to the thulium blue up conversion emission, under excitation around 792 nm. Analysis of the 475 nm emission for the samples with different concentrations of Nd 3+ ions showed that energy transfer between Nd 3+ and Yb 3+ is the main mechanism and responsible for an enhancement in up conversion.

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“…Finally our recent investigation [16][17][18][19][20][21] of those materials has enabled us to understand the optimal conditions for operation (excitation conditions, screen preparation, choice of materials) as are discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Materials and Modulators for True 3-Dimensional Displays

Bass¹

2005

Self Cite

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We review the properties of up-conversion materials and assess their potential for a new display technology. Up-conversion materials absorb near infrared light and reemit in the visible. Some of their most appealing characteristics for displays are: a wide color gamut with very saturated colors, very high brightness operation without damage to the emitters, long lifetimes and efficiencies comparable to those of existing technologies.Other advantages include simplicity of fabrication, versatility of operation modes, and the potential for greatly reduced display weight and depth.

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Role of pump duration on temperature and efficiency of up-conversion in fluoride crystals co-doped with ytterbium and thulium

Cited by 17 publications

References 12 publications

Population inversion of G14 excited state of Tm3+ investigated by means of numerical solutions of the rate equations system in Yb:Tm:Nd:LiYF4 crystal

Population inversion of G14 excited state of Tm3+ investigated by means of numerical solutions of the rate equations system in Yb:Tm:Nd:LiYF4 crystal

Enhancement of blue thulium emission on Nd:Yb:Tm-doped YLF crystals

Materials and Modulators for True 3-Dimensional Displays

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