Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate
Autor(en): | Freytag, Felix Booker, Phillip Corradi, Gabor Messerschmidt, Simon Krampf, Andreas Imlau, Mirco |
Stichwörter: | CRYSTALS; GENERATION; LINBO3; Materials Science; Materials Science, Multidisciplinary; MG; OPTICAL-DAMAGE; Optics; TIME | Erscheinungsdatum: | 2018 | Herausgeber: | OPTICAL SOC AMER | Journal: | OPTICAL MATERIALS EXPRESS | Volumen: | 8 | Ausgabe: | 6 | Startseite: | 1505 | Seitenende: | 1514 | Zusammenfassung: | 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 |
ISSN: | 21593930 | DOI: | 10.1364/OME.8.001505 |
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geprüft am 02.06.2024