Physical review. B, Condensed matter

Photon-assisted off-resonance energy transfer between Cr3+ and Gd3+ in GdAlO3

José Luciano Miranda Duarte, Jarbas Caiado de Castro

Published Sep 1, 1992• 2 citations

Abstract

We report here a clear observation of photon-assisted off-resonance energy transfer. Our experiment was carried out in crystals of gadolinium aluminate (${\mathrm{GdAlO}}_{3}$) doped with chromium ions (${\mathrm{Cr}}^{3+}$). The observed phenomenon consists of the energy transfer from a ${\mathrm{Cr}}^{3+}$ ion, previously excited to the $^{2}$E state (located at about 13.770 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ above the ground state), to a neighbor ${\mathrm{Gd}}^{3+}$ ion (which has the first excited state located at about 31.840 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$), with the simultaneous absorption of a photon that energy matches exactly the difference between the gadolinium excited-state energy and the energy supplied by the chromium ion.

DOI: 10.1103/physrevb.46.6578

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Cooperative Absorption and Luminescence in Cr3+ -Doped EuAl O3

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Physical review. B, Condensed matter

Photon-assisted off-resonance energy transfer between Cr3+ and Gd3+ in GdAlO3

José Luciano Miranda Duarte, Jarbas Caiado de Castro

Published Sep 1, 1992• 2 citations

Publisher

Abstract

We report here a clear observation of photon-assisted off-resonance energy transfer. Our experiment was carried out in crystals of gadolinium aluminate (

{\mathrm{GdAlO}}_{3}

) doped with chromium ions (

{\mathrm{Cr}}^{3+}

). The observed phenomenon consists of the energy transfer from a

{\mathrm{Cr}}^{3+}

ion, previously excited to the

^{2}

E state (located at about 13.770

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

above the ground state), to a neighbor

{\mathrm{Gd}}^{3+}

ion (which has the first excited state located at about 31.840

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

), with the simultaneous absorption of a photon that energy matches exactly the difference between the gadolinium excited-state energy and the energy supplied by the chromium ion.

DOI: 10.1103/physrevb.46.6578

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Resonant enhancement of direct two-photon absorption in Tb3+ : LiYF4

Huang Jin, G. K. Liu, R. L. Cone

Resonant enhancement by a factor of over 20 of direct two-photon absorption from the ground state $^{7}\mathrm{F}_{6}$ to the excited state $^{5}\mathrm{G}_{6}$ of the 4 ${f}^{8}$ configuration of the ${\mathrm{Tb}}^{3+}$ ion at 40 200 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ has been observed in time-resolved experiments with two separate pulsed lasers. The results provide clear evidence for resonant enhancement of two-photon absorption in rare-earth compounds and imply a similar enhancement for Raman scattering and nonlinear-optical mixing. Two separate contributions to the direct transition moment were observed. When a single laser frequency was used, the intermediate states which made the largest contribution were from excited configurations of opposite parity; those intermediate states were far from resonance. Detailed two-frequency experiments showed, however, that near a single photon $^{7}\mathrm{F}_{6}$ ${\mathrm{\ensuremath{-}}}^{5}$ ${\mathrm{D}}_{4}$ resonance, a much stronger contribution arose from the 4 ${f}^{8}$ configuration $^{5}\mathrm{D}_{4}$ intermediate state. Two-photon absorption was clearly isolated from two-step (incoherent) excitation by varying the timing of two separately triggered lasers.Resonant enhancement by a factor of over 20 of direct two-photon absorption from the ground state $^{7}\mathrm{F}_{6}$ to the excited state $^{5}\mathrm{G}_{6}$ of the 4${f}^{8}$ configuration of the ${\mathrm{Tb}}^{3+}$ ion at 40 200 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ has been observed in time-resolved experiments with two separate pulsed lasers. The results provide clear evidence for resonant enhancement of two-photon absorption in rare-earth compounds and imply a similar enhancement for Raman scattering and nonlinear-optical mixing. Two separate contributions to the direct transition moment were observed. When a single laser frequency was used, the intermediate states which made the largest contribution were from excited configurations of opposite parity; those intermediate states were far from resonance. Detailed two-frequency experiments showed, however, that near a single photon $^{7}\mathrm{F}_{6}$${\mathrm{\ensuremath{-}}}^{5}$${\mathrm{D}}_{4}$ resonance, a much stronger contribution arose from the 4${f}^{8}$ configuration $^{5}\mathrm{D}_{4}$ intermediate state. Two-photon absorption was clearly isolated from two-step (incoherent) excitation by varying the timing of two separately triggered lasers.

Physical review. B, Condensed matterApr 1, 198920 citations

TWO PHOTON SPECTROSCOPY OF ELECTRONIC TSANSITIONS IN PURE GdA10 3

Luiz A. O. Nunes, Joaquim Coutinho Neto

Jul 18, 19880 citations

We report here a clear observation of photon-assisted off-resonance energy transfer. Our experiment was carried out in crystals of gadolinium aluminate (

{\mathrm{GdAlO}}_{3}

) doped with chromium ions (

{\mathrm{Cr}}^{3+}

). The observed phenomenon consists of the energy transfer from a

{\mathrm{Cr}}^{3+}

ion, previously excited to the

^{2}

E state (located at about 13.770

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

above the ground state), to a neighbor

{\mathrm{Gd}}^{3+}

ion (which has the first excited state located at about 31.840

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

), with the simultaneous absorption of a photon that energy matches exactly the difference between the gadolinium excited-state energy and the energy supplied by the chromium ion.

Absorption and emission involving exchange-coupled nearest-neighbor

{\mathrm{Cr}}^{3+}

and

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

ions have been observed in

{\mathrm{Cr}}^{3+}

-doped EuAl

{\mathrm{O}}_{3}

at the sum of the chromium

^{2}E_{g}

and europium

^{7}F_{1}

energies. Weak absorption at the difference energy has also been observed. The latter is the inverse of the previously studied europium terminated chromium emission. The intensities of the

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

sideband transitions vary with the strength of the exchange-induced electric dipole moment.

Transitions to the states of

{\mathrm{Cr}}^{3+}

pairs where both ions are excited to the

^{2}E_{g}

levels have been observed in LaAl

{\mathrm{O}}_{3}

{\mathrm{Cr}}^{3+}

. Of the predicted eight pair levels, three of the

S=0

and one of the

S=1

levels have definitely been identified at approximately twice the

^{2}E_{g}

energy absorption. The remaining transitions either are obscured by the strong vibronic spectrum or are very weak. The polarization of the lines agrees with a model based on the mechanism of exchange-induced electric dipole moment.

Resonant enhancement by a factor of over 20 of direct two-photon absorption from the ground state

^{7}\mathrm{F}_{6}

to the excited state

^{5}\mathrm{G}_{6}

of the 4

{f}^{8}

configuration of the

{\mathrm{Tb}}^{3+}

ion at 40 200 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ has been observed in time-resolved experiments with two separate pulsed lasers. The results provide clear evidence for resonant enhancement of two-photon absorption in rare-earth compounds and imply a similar enhancement for Raman scattering and nonlinear-optical mixing. Two separate contributions to the direct transition moment were observed. When a single laser frequency was used, the intermediate states which made the largest contribution were from excited configurations of opposite parity; those intermediate states were far from resonance. Detailed two-frequency experiments showed, however, that near a single photon

^{7}\mathrm{F}_{6}

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

{\mathrm{D}}_{4}

resonance, a much stronger contribution arose from the 4

{f}^{8}

configuration

^{5}\mathrm{D}_{4}

intermediate state. Two-photon absorption was clearly isolated from two-step (incoherent) excitation by varying the timing of two separately triggered lasers.