Journal
OPTICAL MATERIALS EXPRESS
Volume 8, Issue 6, Pages 1505-1514Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.8.001505
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [IM37/5-2, INST 190/137-1 FUUG, INST 190/165-1]
- Osnabrueck University
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Femtosecond-pulse-induced (E-pump = 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 approximate to 0.5 eV), for t > 1 ps. The modelling succeeds by considering small Nb-Nb(4+) 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. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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