Journal of the Optical Society of America

Some Studies of Relaxation Processes in Tb^3+ Using Pulsed Excitation

GEORGE E. PETERSON, Paul M. Bridenbaugh

Published Oct 1, 1963• 57 citations

Abstract

In this paper the relaxation paths of Tb3+ in two hosts, SrMoO4 and Na0.5Eu0.5WO4, are studied using pulsed and continuous illumination. In the molybdate structure we find that resonance coupling between the host lattice and the rare earths strongly influences the energy levels excited. The doping of Na0.5Eu0.5WO4 with Tb results in a rare-earth-ion–rare-earth-ion resonance-coupled system in which the Eu may be excited by pumping the Tb.

DOI: 10.1364/josa.53.001129

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Journal of the Optical Society of America

Some Studies of Relaxation Processes in Tb^3+ Using Pulsed Excitation

GEORGE E. PETERSON, Paul M. Bridenbaugh

Published Oct 1, 1963• 57 citations

Publisher

Abstract

DOI: 10.1364/josa.53.001129

Related papers

Study of Relaxation Processes in Nd Using Pulsed Excitation

GEORGE E. PETERSON, Paul M. Bridenbaugh

Journal of the Optical Society of AmericaMay 1, 196467 citations

Luminescence in rare-earth-doped thiospinels

M. Brown, W. A. Shand

Narrow line optical absorption and emission spectra have been observed in Nd3+- and Er3+-doped In2S3, CdIn2S4, and ZnIn2S4. All three spectra show essentially the same structure, and this indicates that the rare-earth ions occupy the same type of environment in the three lattices. The sites most probably have octohedral symmetry, since electron spin resonance results show that the site for CdIn2S4is octohedral. Fluorescence has been observed from all the Er3+- levels almost up to the host lattice band-gap energy above the ions ground state, under both X-ray and ultraviolet excitation. This fluorescence shows the same dependance on rare-earth concentration, method of excitation, and intensity for all three doped host lattices, provided the emission frequency is well removed from the band-gap frequency. The temperature dependance of the fluorescence, however, increases as the emission frequency approaches the host lattice band-gap frequency, and this indicates that a relationship may exist between the extent of the temperature dependance and the magnitude of the band-gap frequency.Narrow line optical absorption and emission spectra have been observed in Nd3+- and Er3+-doped In2S3, CdIn2S4, and ZnIn2S4. All three spectra show essentially the same structure, and this indicates that the rare-earth ions occupy the same type of environment in the three lattices. The sites most probably have octohedral symmetry, since electron spin resonance results show that the site for CdIn2S4is octohedral. Fluorescence has been observed from all the Er3+- levels almost up to the host lattice band-gap energy above the ions ground state, under both X-ray and ultraviolet excitation. This fluorescence shows the same dependance on rare-earth concentration, method of excitation, and intensity for all three doped host lattices, provided the emission frequency is well removed from the band-gap frequency. The temperature dependance of the fluorescence, however, increases as the emission frequency approaches the host lattice band-gap frequency, and this indicates that a relationship may exist between the extent of the temperature dependance and the magnitude of the band-gap frequency.

IEEE Journal of Quantum ElectronicsNov 1, 19681 citation

Anisotropic Optical-Response of Eu-doped Yttrium Orthosilicate

Huimin Liu, M. L. Santiago, Weiyi Jia +1 more

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Optical Measurement of Narrow Band Rare-Earth 4f Levels with Energies Greater than the Band Gap of the Host

T. Schweizer, P. E.-A. Möbert, Jason Hector +4 more

Excited-state absorption spectra of erbium and thulium doped gallium lanthanum sulfide glasses reveal transitions whose final $4f$ states do not appear in the ground state absorption spectra due to resonance with the fundamental absorption of the glass host. The results give direct evidence for the model of isolated rare-earth ions with highly shielded $4f$ levels showing no noticeable interaction with the host material despite resonance. Only the energy splitting of the $4f$ levels is relevant for energy transfer processes between rare-earth ions and the host material, whereas the absolute energetic position is unimportant.Excited-state absorption spectra of erbium and thulium doped gallium lanthanum sulfide glasses reveal transitions whose final $4f$ states do not appear in the ground state absorption spectra due to resonance with the fundamental absorption of the glass host. The results give direct evidence for the model of isolated rare-earth ions with highly shielded $4f$ levels showing no noticeable interaction with the host material despite resonance. Only the energy splitting of the $4f$ levels is relevant for energy transfer processes between rare-earth ions and the host material, whereas the absolute energetic position is unimportant.

Physical Review LettersFeb 16, 199823 citations

Photon-echo-relaxation measurements made on the

^{3}\mathrm{H}_{4}

${\mathrm{\ensuremath{-}}}^{3}$

{\mathrm{P}}_{0}

transition of 0.01 at. %

{\mathrm{Pr}}^{3+}

:YAG (where YAG represents yttrium aluminum garnet),

^{3}\mathrm{H}_{4}

${\mathrm{\ensuremath{-}}}^{1}$

{\mathrm{D}}_{2}

transition in 0.1 at. %

{\mathrm{Pr}}^{3+}

{\mathrm{YAlO}}_{3}

, and

^{7}\mathrm{F}_{0}

${\mathrm{\ensuremath{-}}}^{5}$

{\mathrm{D}}_{0}

transition in 0.25 at. %

{\mathrm{Eu}}^{3+}

{\mathrm{YAlO}}_{3}

show that the photon-echo relaxation rate increases when the intensities of the excitation pulses are increased. Although a part of the relaxation-rate increase in

{\mathrm{Pr}}^{3+}

:YAG may be attributed to an instantaneous spectral diffusion (ISD) in which the presence of excited neighboring

{\mathrm{Pr}}^{3+}

ions change the local field and the absorption frequency of the rare-earth ions, our data deviate significantly from the ISD-model predictions. An additional intensity-dependent relaxation mechanism is required to explain the results.

Excited-state absorption spectra of erbium and thulium doped gallium lanthanum sulfide glasses reveal transitions whose final

4f

states do not appear in the ground state absorption spectra due to resonance with the fundamental absorption of the glass host. The results give direct evidence for the model of isolated rare-earth ions with highly shielded

4f

levels showing no noticeable interaction with the host material despite resonance. Only the energy splitting of the

4f

levels is relevant for energy transfer processes between rare-earth ions and the host material, whereas the absolute energetic position is unimportant.