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

Originalpublikation

Freytag, F.; Booker, P.; Corradi, G.; Messerschmidt, S.; Krampf, A.; Imlau, M.: Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate. In: Optical Materials Express 8 (2018), Nr. 6, S. 1505-1514. DOI: https://doi.org/10.1364/OME.8.001505

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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 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.
Lizenzbestimmungen: OSA Open Access License - https://www.osapublishing.org/submit/review/open-access-policy-statement.cfm
Publikationstyp: Article
Publikationsstatus: publishedVersion
Erstveröffentlichung: 2018
Schlagwörter (englisch): Electromagnetic pulse, Electrons, Infrared absorption, Infrared devices, Lithium, Magnesium, Niobium compounds, Phonons, Polarons, Electron cooling, Electron hole pairs, Electron phonon couplings, Electron phonon scattering, Electron polarons, Mid infrared absorptions, Self localization, Spectral region, Light absorption
Fachliche Zuordnung (DDC): 530 | Physik

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