Spectral and kinetic peculiarities of the radiation trapping effect in doped materials

Babajanyan, V. G.; Kostanyan, R. B.; Muzhikyan, P. H.

doi:10.1016/j.optmat.2015.03.040

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…The stimulated emission cross-sectional spectra of the Er 3+ :GdPO 4 crystal for E // Y polarization and Er 3+ :YPO 4 crystal for π polarization at 1450–1650 nm calculated by the two methods are shown in Figure a,b, respectively. σ em (λ) values obtained from the F–L equation are different from those based on the RM method for both crystals due to the distortion of the measured fluorescence spectra caused by the effect of radiation trapping. − The largest difference happens at 1506 nm for the Er 3+ :YPO 4 crystal because the absorption cross section at this wavelength is large to cause a serious radiation trapping effect.…”

Section: Resultsmentioning

confidence: 90%

Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application

Han,

Lin,

Huang

et al. 2024

Crystal Growth & Design

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Using the top-seeded flux method, monoclinic Er 3+ :GdPO 4 and tetragonal Er 3+ :YPO 4 crystals were grown. Polarized spectral properties of these two crystals with different structures were investigated at room temperature and compared. Peak absorption cross sections of the Er 3+ :GdPO 4 crystal for E//Y polarization and Er 3+ :YPO 4 crystal for π polarization are 1.02 × 10 −20 cm 2 at 1525 nm and 4.11 × 10 −20 cm 2 at 1506 nm, respectively. Peak emission cross sections of the Er 3+ :GdPO 4 crystal for E//Y polarization and Er 3+ :YPO 4 crystal for π polarization are 0.88 × 10 −20 cm 2 at 1525 nm and 2.28 × 10 −20 cm 2 at 1506 nm, respectively. For the 4 I 13/2 multiplet of the Er 3+ :GdPO 4 and Er 3+ :YPO 4 crystals, the fluorescence lifetimes are 5.32 and 4.49 ms, and the fluorescence quantum efficiencies are 81 and 95%, respectively. The full widths at half-maximum of the gain spectra of the Er 3+ :GdPO 4 crystal for E//Z polarization and Er 3+ :YPO 4 crystal for π polarization are 60 and 8 nm, respectively, when the inversion parameter is 0.5. Experimental results indicate that the Er 3+ :YPO 4 crystal is a good gain medium of the highly efficient, high-power, and low-threshold 1.55 μm laser, while the Er 3+ :GdPO 4 crystal is a promising gain medium used in broadband tunable and ultrashort pulse 1.55 μm lasers.

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Section: Resultsmentioning

confidence: 90%

Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application

Han,

Lin,

Huang

et al. 2024

Crystal Growth & Design

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Further studies of radiation trapping in Er3+ doped chalcogenide glasses

et al. 2019

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Absorption and emission bands in trivalent erbium ions Er 3+ are known to strongly overlap, which means that in heavily doped samples, it is possible to observe the effects of sequential radiation absorption and re-emission processes that involve the Er 3+ ions. In particular, this effect of "radiation trapping" (RT) or "radiation/ excitation diffusion" is responsible for the dependence of the measured photoluminescence (PL) lifetime and PL spectrum shape in Er 3+ chalcogenide glasses on the rareearth doping concentration and sample size. [1,2]. It is worth mentioning here that the original name "excitation diffusion" originates from Milne's paper where he pointed out the formal similarity of equations describing the effect with those for normal diffusion [3].In present paper we present the results of experiments which are design to maximize the effect of RT by passing the light along the bulk of a chalcogenide glass sample as shown in Figure 1 (b-d). We carry out experiments on samples having regular cylindrical shape, which allows us to do some simple calculations predicting the shape and lifetime of PL (see Equations (1-3) in Figure 1). The results of these predictions appear to be in a very good agreement with experimental data as shown in Figure 1(a). These results show that RT effectively "stirs" the excitation inside of sample, evenly distributing it throughout the whole volume of the sample. Figure 1. The design of experiment is shown in (d). The excitation light interacts with a fine powder of material and PL of the powder is filtered by a long-pass filter allowing only 4 I13/2 4 I15/2 emission to reach the bulk sample. The PL coming out from the other side of the bulk sample (blue line in (a)) is a combination of emission of powder partially absorbed by bulk (green line in (a)) and radiation trapped inside of bulk sample (maroon line in (a)). The spectra of both contributors () and u() are calculated using Equations (1) and (2) where ion()is the emission spectrum of isolated Er 3+ ion, () is the absorption coefficient and L is the length of the bulk cylindrical sample. The results of calculations using Equation (3), shown in (a) by open red circles, demonstrate a very good agreement with experimental data.It is worth noting that the results in Figure 1(a) refer to the 4 I13/2 4 I15/2 emission band. In the present paper, we also investigate the effect of RT on the PL of the upper 4 I11/2 4 I13/2 emission band and demonstrate the effect of competition of RT with non-radiative relaxation. We build a Monte Carlo model of the effect and discuss how RT can be used to extract useful information concerning the material properties.

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Electronic excitation energy transfer processes in Er:YAG under variable pump duration

et al. 2018

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Spectral and kinetic peculiarities of the radiation trapping effect in doped materials

Cited by 6 publications

References 18 publications

Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application

Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application

Further studies of radiation trapping in Er3+ doped chalcogenide glasses

Electronic excitation energy transfer processes in Er:YAG under variable pump duration

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Spectral and kinetic peculiarities of the radiation trapping effect in doped materials

Cited by 6 publications

References 18 publications

Growth and Spectroscopic Comparison of Monoclinic Er3+:GdPO4 and Tetragonal Er3+:YPO4 Crystals for 1.55 μm Laser Application

Growth and Spectroscopic Comparison of Monoclinic Er3+:GdPO4 and Tetragonal Er3+:YPO4 Crystals for 1.55 μm Laser Application

Further studies of radiation trapping in Er3+ doped chalcogenide glasses

Electronic excitation energy transfer processes in Er:YAG under variable pump duration

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Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application

Growth and Spectroscopic Comparison of Monoclinic Er³⁺:GdPO₄ and Tetragonal Er³⁺:YPO₄ Crystals for 1.55 μm Laser Application