Two-Photon Spectroscopy in Insulating Crystals

Grassano, U. M.

doi:10.1007/978-1-4615-3044-2_21

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…In addition to this, the optical excitation was observed to be spatially migrating and the fluorescence lineshape was dependent on crystal size [5]. In [5] all of those observations were consistently explained in terms of an exciton-polariton (EP) [7,8] picture. In this case the 3p state of the Na − constitutes an excitonic state which couples with a photon to form the EP state.…”

Section: Introductionmentioning

confidence: 84%

“…As we shall see in section 4, the SES also provides a suitable mechanism for the nonradiative transition of the EPs: the reduced amount of negative charge inside the octahedron induces relaxation of the lattice in a breathing mode, and the SES de-excites nonradiatively via this lattice deformation. Also note that the coupling strength of the exciton and the photon depends on the dipole matrix element between the ground state and the excitonic state [8]. Since the SES has a spherically symmetric wavefunction, it is obvious that it will not couple with the photon to form another EP state.…”

Section: The Rate Of Transition Of Exciton-polaritons Into Spatially ...mentioning

confidence: 99%

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The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

Park¹

1996

J. Phys.: Condens. Matter

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To account for the strong temperature dependence of the photoluminescence intensity from sodium cryptand sodide, we introduce a spatially extended excitonic state into which exciton-polaritons can be scattered. The relevancy of such a state is discussed. By considering the exciton-polariton transport equation which includes the annihilation process for excitonpolaritons, we derive the dependence of the fluorescence intensity on temperature. It is shown that the annihilation process is completed very early during the time evolution of the excitonpolaritons, which is consistent with the experimental observation. The nonradiative transition of the spatially extended state is described in terms of a spherically symmetric lattice relaxation induced by the diffuse wavefunction of the spatially extended state. Continuum elasticity theory and variational principles are combined in an effort to find the electron-lattice coupling that is responsible for a polaron state in sodium cryptand sodide. Bartram and Stoneham's criterion is employed in establishing the maximum allowable speed of sound in sodium cryptand sodide.

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Section: Introductionmentioning

confidence: 84%

Section: The Rate Of Transition Of Exciton-polaritons Into Spatially ...mentioning

confidence: 99%

The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

Park¹

1996

J. Phys.: Condens. Matter

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“…A 1g → 2g TPA transition is therefore symmetry forbidden. The 4g irrep belongs to the antisymmetric direct product representation of 4u ⊗ 4u , and a 1g → 4g transition has zero intensity when using two photons from a single beam in the present case since the polarization dependence is (ε × ε) 2 [17].…”

Section: Theorymentioning

confidence: 84%

Analysis of (⁷F₀)Γ_1g→ (⁵D₂)Γ_5g, Γ_3gand (⁷F₀)Γ_1g→(⁵L₆)Γ_1g, aΓ_5gtwo-photon absorption spectra of Cs₂NaYF₆:Eu³⁺

Ning

Wang

Xia

et al. 2002

J. Phys.: Condens. Matter

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The direct calculation of transition line strengths and relative intensities is presented for two intraconfigurational two-photon absorption (TPA) transitions of Eu3+ in the cubic Cs2NaYF6 host. Crystal field wavefunctions were utilized for the initial and final fN-electron states and various approaches were used in constructing all the 4fN-1 5d1 intermediate-state wavefunctions. The calculated relative intensities of the (7F0) Γ1g→(5D2)Γ5g, Γ3g TPA transitions are in reasonable agreement with experiment. The neglect of J-mixing in the initial state has only a small effect upon the calculation, whereas the neglect of spin-orbit couplings within the initial and terminal states drastically reduces the calculated transition linestrengths, but does not markedly change the intensity ratios. In the case of the (7F0)Γ1g→(5L6)Γ1g, aΓ5g transitions, serious discrepancies between experiment and theory are found if the intermediate states are constructed from a 4f5 core comprising free ion states and the 5d1 crystal field states. Satisfactory agreement is, however, found when the 4f5 crystal field states are utilized in constructing the intermediate states. The contributions to the transition moment have been evaluated for various Hamiltonian terms and the results are discussed.

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Optical Nonlinearities of Color Centers in Alkali Halides

Baldacchini

1994

NATO ASI Series

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Two-Photon Spectroscopy in Insulating Crystals

Cited by 5 publications

References 26 publications

The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

Analysis of (⁷F₀)Γ_1g→ (⁵D₂)Γ_5g, Γ_3gand (⁷F₀)Γ_1g→(⁵L₆)Γ_1g, aΓ_5gtwo-photon absorption spectra of Cs₂NaYF₆:Eu³⁺

Optical Nonlinearities of Color Centers in Alkali Halides

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Two-Photon Spectroscopy in Insulating Crystals

Cited by 5 publications

References 26 publications

The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

The temperature dependence of the fluorescence intensity and a nonradiative de-excitation process in sodium cryptand sodide

Analysis of (7F0)Γ1g→ (5D2)Γ5g, Γ3gand (7F0)Γ1g→(5L6)Γ1g, aΓ5gtwo-photon absorption spectra of Cs2NaYF6:Eu3+

Optical Nonlinearities of Color Centers in Alkali Halides

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Analysis of (⁷F₀)Γ_1g→ (⁵D₂)Γ_5g, Γ_3gand (⁷F₀)Γ_1g→(⁵L₆)Γ_1g, aΓ_5gtwo-photon absorption spectra of Cs₂NaYF₆:Eu³⁺