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

Felix Freytag, Phillip Booker, Gábor Corradi, Simon Messerschmidt, Andreas Krampf, Mirco Imlau

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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 noninstantaneous 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) twophoton 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 electronphonon- coupling.

Original languageEnglish
Pages (from-to)1505-1514
Number of pages10
JournalOptical Materials Express
Issue number6
Publication statusPublished - Jan 1 2018


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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