Pulse-induced transient blue absorption relatedwith long-lived excitonic states in iron-dopedlithium niobate

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Title: Pulse-induced transient blue absorption relatedwith long-lived excitonic states in iron-dopedlithium niobate
Authors: Messerschmidt, Simon
Bourdon, Bjoern
Brinkmann, David
Krampf, Andreas
Vittadello, Laura
Imlau, Mirco
ORCID of the author: https://orcid.org/0000-0002-5343-5636
Abstract: Transient absorption is studied in Fe-doped lithium niobate single crystals with the goal to control and probe a blue absorption feature related with excitonic states bound to FeLi defect centers. The exciton absorption is deduced from the comparison of ns-pump, supercontinuum-probe spectra obtained in crystals with different Fe-concentration and Fe2+/3+Li-ratio, at different pulse peak and photon energies as well as by signal separation taking well-known small polaron absorption bands into account. As a result, a broad-band absorption feature is deduced being characterized by an absorption cross-section of up to max(2.85 eV)=(4±2)⋅10−22 m2. The band peaks at about 2.85 eV and can be reconstructed by the sum of two Gaussians centered at 2.2 eV (width ≈0.5 eV) and 2.9 eV (width ≈0.4 eV), respectively. The appropriate build-up and decay properties strongly depend on the crystals’ composition as well as the incident pulse parameters. All findings are comprehensively analyzed and discussed within the model of Fe2+Li−O−−VLi excitonic states.
Citations: Optical Materials Express Vol. 9, Issue 7, pp. 2748-2760, 2019
URL: https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201907171850
Subject Keywords: Transient absorption; long-lived excitonic states
Issue Date: 3-Jun-2019
License name: Attribution 4.0 International
License url: http://creativecommons.org/licenses/by/4.0/
Type of publication: Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Appears in Collections:FB04 - Hochschulschriften

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