Titel:	Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate
Autor(en):	Freytag, Felix Booker, Phillip Corradi, Gábor Messerschmidt, Simon Krampf, Andreas Imlau, Mirco
ORCID des Autors:	https://orcid.org/0000-0001-5790-9379 https://orcid.org/0000-0001-6193-7487
Zusammenfassung:	Femtosecond-pulse-induced (Epump = 2.5 eV) picosecond infrared absorption is studied in the spectral region between 0.30 eV and 1.05 eV in LiNbO3:Mg. We find a non-instantaneous mid-infrared absorption peak in the time domain up to 1 ps and a broad-band, long-lived absorption (maximum at 0.85 eV, width ≈ 0.5 eV), for t > 1 ps. The modelling succeeds by considering small Nb4+Nb electron polaron formation along the sequence: (i) two-photon injection of hot electron-hole pairs at Nb-O-octahedra, (ii) dissociation and electron cooling by electron-phonon-scattering, and (iii) electron self-localization by strong electron-phonon-coupling.
Bibliografische Angaben:	Optical Materials Express, Volume 8, Number 6, 2018, P. 1505-1514
URL:	https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201901231039
Schlagworte:	Optical nonlinearities; condensed matter; Spectroscopy; infrared
Erscheinungsdatum:	15-Mai-2018
Publikationstyp:	Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Enthalten in den Sammlungen:	FB06 - Hochschulschriften Open-Access-Publikationsfonds

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