Polarization of the fluorescence excited in erbium-doped fibers in 1490–1570nm spectral range

Martínez-Martínez, Liliana O.; Hernández-Hernández, Eliseo; Stepanov, S.

doi:10.1016/j.optcom.2013.06.003

Cited by 1 publication

(4 citation statements)

References 17 publications

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“…The excitation intensity dependences for the collinearly and for the orthogonally polarized fluorescence components obtained for similar model of randomly oriented dipoles were reported earlier-see e.g. [17,21]. Normalized to the maximum (i.…”

Section: Randomly Oriented Dipolessupporting

confidence: 56%

“…This trend is, obviously, quite predictable: the less anisotropic are the centers, the less important is their orientation, and this effect goes down to 0 in case of centers with the spherical symmetry (β = 1). From the reported experiments on PHB [15,16] and on polarization of the fluorescence [17] in EDF, the anisotropy factor β was evaluated to be in the range 0.5-0.7. As one can see from figure 6(a), the random orientation of the centers with such anisotropy does not change practically the expected maximal grating amplitude; the increase of the FWHM width of the maximum when it is measured in the units of the effective saturation power is also insignificant.…”

Section: Discussionmentioning

confidence: 99%

“…On the opposite, as it was mentioned above, their experimentally observed values are rather small. To reduce the discrepancy between the theory and experiment, the phenomenological model of active centers with the reduced anisotropy (as compared with the dipole) was proposed in [15,16] and utilized for explanation of the PHB effect and later of the polarization of the fluorescence [17,21] in EDF.…”

Section: Active Ions With Reduced Anisotropymentioning

confidence: 99%

“…Later we consider the more complicated presentation of the rareearth ions as the optical centers with the reduced anisotropy. Earlier, the latter phenomenological approach was successfully utilized to explain the polarization hole burning (PHB) [15,16] and the polarization of the fluorescence [17], experimental data reported for EDFs.…”

Section: Introductionmentioning

confidence: 99%

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Population gratings in saturable optical fibers with randomly oriented rare-earth ions

Stepanov

Martínez

Hernández

et al. 2015

J. Opt.

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Formation of the dynamic population gratings in optical fibers with randomly oriented rare-earth ions is analyzed with a special interest to the grating component for readout with the orthogonal light polarization. It is shown that as compared with a simple model case of the collinearly oriented dipole-like centers their random orientation leads to approximately 2-times growth of the effective saturation power P sat when it is estimated from the incident power dependence of the fiber absorption or from that of the fluorescence intensity. An optimal incident power, for which the maximum of the dynamic population grating amplitude for collinear light polarization is observed, also follows this change in P sat , while formation of the grating for orthogonal polarization needs essentially higher light power. The reduced anisotropy of the active centers, which is in charge of the experimentally observed weakening of the polarization hole burning (PHB) and of the fluorescence polarization, compensates in some way the effect of random ion orientation. The ratio between the maximum conventional (i.e. for the interacting waves collinear polarizations) two-wave mixing (TWM) amplitude and the initial not saturable fiber optical density proves to be, however, nearly the same as in the model case of collinearly oriented dipoles. The ratio between the PHB effect and the amplitude of the anisotropic grating, which is responsible for TWM of the orthogonally polarized waves, is also not influenced significantly by the reduced anisotropy of ions.

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Section: Randomly Oriented Dipolessupporting

confidence: 56%