Three-Photon Spectroscopy of Exciton Polaritons in Alkali Halides

Beerwerth, F.; Fröhlich, D.

doi:10.1103/physrevlett.55.2603

Cited by 48 publications

(21 citation statements)

References 22 publications

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“…Due to band degeneracy, in alkali halides the S-exciton states are degenerate consisting of the orthoexcitons of r, symmetry and the paraexciton states of r; and r; symmetry. Because of parity selection rules, the one-photon allowed polariton resonances, which are due to transitions to the excitons, cannot be excited by TPA within the electric dipole approximation [7]. The paraexcitons as pure triplet states can also not be excited by an electric dipole transition.…”

Section: Introductionmentioning

confidence: 99%

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Phonon‐Assisted Two‐Photon Absorption in the Reststrahl Region of Excitons in Alkali Halides

Fröhlich

Rübenacke

Schlutt

et al. 1995

Physica Status Solidi (b)

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The two-photon spectrum of RbI is investigated in the energy region of the lowest IS exciton. A significant increase of the two-photon signal is observed when crossing the transverse energy and scanning through the excitonic reststrahl region. This phenomenon is explained by a LO-phononassisted absorption process based on the Frohlich exciton-phonon coupling. Evaluating the two-photon excitation within a two-band model allows a quantitative analysis, which shows good agreement with the experimental data. Besides a scaling factor, the only fit parameter is the exciton Bohr radius that is found in reasonable agreement with the Wannier exciton model.

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Section: Introductionmentioning

confidence: 99%

“…The solution of the integral (6) is then given by [17] 4 e . h CK For the transition probability W we get (7) Since the final states are continuous, we replace the summation by an integration introducing the density of states of the lower branch of the polariton gpo,(E),…”

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confidence: 99%

Phonon‐Assisted Two‐Photon Absorption in the Reststrahl Region of Excitons in Alkali Halides

Fröhlich

Rübenacke

Schlutt

et al. 1995

Physica Status Solidi (b)

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“…As described by Beerwerth and Frohlich [5,6] three photons can cause a valence electron in KI to undergo a transition to excitonic states just below the conduction band. After such a transition KI emits light mostly at 300 and 370 nm.…”

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confidence: 98%

“…This paper represents an attempt to mitigate some of the problems by using nonlinear optical (multiphoton) excitation of a solid at high pressure. We report direct measurements of the pressure dependence of the energetically lowest polariton in KI via the three-photon-spectroscopy (TPS) method recently introduced and extensively used by Frohlich and co-workers in a series of detailed investigations of alkali halides [5][6][7].…”

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Electronic structure measurements in KI at high pressure using three-photon spectroscopy

Lipp

1991

Phys. Rev. Lett.

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This work is the first report of the use of nonlinear optics techniques to probe the pressure dependence of electronic energy levels in a solid. An advantage which may be significant is that for the multiphoton processes involved, relatively low-energy photons that are not absorbed by the cell windows can probe states having energies which would be strongly absorbed by the windows in a one-photon excitation. The measurements follow the pressure dependence of the energetically lowest polariton in KI using the three-photon-spectroscopy method.

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Temperature Dependence of Exciton Linewidth in CsI and CsBr

Beerwerth

Fröhlich

Leinweber

1988

Physica Status Solidi (b)

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The temperature dependence of the linewidth of the lowest two r; excitons in Csl and in CsBr and of a very narrow I ? ; exciton in CsI is reported. All spectra are measured by three-photon spectroscopy. The analysis of the experimental results allows conclusions about the decay mechanism of excitons in alkali halides. The temperature dependent broadening is quantitatively described by taking into account exciton-phonon interaction.Die Temperaturabhiingigkeit der Linienbreiten der beiden niederenergetischen r;-Exzitonen in CsI und CsBr und eines sehr schmalen r;-Exzitons in CsI wird untersucht. Alle Spektren werden mit der Methode der Dreiphotonenspektroskopie ausgemessen. Die Auswertung der experimentellen Resultate erlaubt Ruckschliisse auf den Zerfdlsmechanismus der Exzitonen in Alkalihalogeniden.Unter Einbeziehung der Exziton-Phonon-Wechselwirkung kann die temperaturabhiingige Linienverbreiterung quantitativ beschrieben werden.

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Three-Photon Spectroscopy of Exciton Polaritons in Alkali Halides

Cited by 48 publications

References 22 publications

Phonon‐Assisted Two‐Photon Absorption in the Reststrahl Region of Excitons in Alkali Halides

Phonon‐Assisted Two‐Photon Absorption in the Reststrahl Region of Excitons in Alkali Halides

Electronic structure measurements in KI at high pressure using three-photon spectroscopy

Temperature Dependence of Exciton Linewidth in CsI and CsBr

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