Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate

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Title: Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate
Authors: Freytag, Felix
Booker, Phillip
Corradi, Gábor
Messerschmidt, Simon
Krampf, Andreas
Imlau, Mirco
ORCID of the author: https://orcid.org/0000-0001-5790-9379
https://orcid.org/0000-0001-6193-7487
Abstract: 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.
Citations: Optical Materials Express, Volume 8, Number 6, 2018, P. 1505-1514
URL: https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201901231039
Subject Keywords: Optical nonlinearities; condensed matter; Spectroscopy; infrared
Issue Date: 15-May-2018
Type of publication: Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Appears in Collections:FB04 - Hochschulschriften

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