Pulse-induced transient blue absorption related with long-lived excitonic states in iron-doped lithium niobate

Autor(en): Messerschmidt, Simon
Bourdon, Bjoern
Brinkmann, David
Krampf, Andreas
Vittadello, Laura
Imlau, Mirco 
Stichwörter: LINBO3; LUMINESCENCE; Materials Science; Materials Science, Multidisciplinary; Optics; SMALL POLARONS
Erscheinungsdatum: 2019
Volumen: 9
Ausgabe: 7
Startseite: 2748
Seitenende: 2760
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 Feu defect centers. The exciton absorption is deduced from the comparison of ns-pump, supercontinuum probe spectra obtained in crystals with different Fe-concentration and Fe-Li(2+/3+) -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 sigma(max )(2.85 eV) = (4 /- 2) . 10(-22) m(2). The band peaks at about 2.85 eV and can be reconstructed by the sum of two Gaussians centered at 2.2 eV (width approximate to 0.5 eV) and 2.9 eV (width approximate to 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 FeLi2+ -O- -V(Li )excitonic states. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
ISSN: 21593930
DOI: 10.1364/OME.9.002748

Show full item record

Page view(s)

Last Week
Last month
checked on Mar 4, 2024

Google ScholarTM