Optically detected magnetic resonance of Cu, Fe and Mn defects in LiNbO3

Autor(en): Pape, M
Reyher, HJ
Schirmer, OF
Stichwörter: CRYSTAL-FIELD PARAMETERS; ELECTRON-SPIN-RESONANCE; EPR; HOLOGRAPHIC STORAGE; Physics; Physics, Condensed Matter
Erscheinungsdatum: 2005
Herausgeber: IOP PUBLISHING LTD
Journal: JOURNAL OF PHYSICS-CONDENSED MATTER
Volumen: 17
Ausgabe: 43
Startseite: 6835
Seitenende: 6847
Zusammenfassung: 
The optical absorptions of Cu2+, Fe3+ and Mn2+ in LiNbO3 are investigated using optically detected magnetic resonance (ODMR). The method is based on the changes of the magnetic circular dichroism (MCD) bands of the ions, caused by the magnetic resonances of the paramagnetic ground states of these ions. All transitions reached from the ground state of Cu2+ lie between 1180 and 860 nm. Three bands are observed, resulting from combined spin-orbit and trigonal field splitting of the first excited crystal field states. All features resulting from Fe3+ have to be ascribed to the forbidden transitions from the (6)A to the (4)G cubic precursor states. Their weak and narrow optical transitions are superimposed on the wide and strong intervalence absorption of Fe2+. This ion leads to a diamagnetic contribution to the MCD, resulting from the Zeeman admixture of the first excited spin state of Fe2+ to its diamagnetic ground state. The MCD of Mn2+ is caused by an intervalence transition to the conduction band. ODMR allows us to detect these bands, lying near 400 nm, which in plain optical absorption are covered by strong precursor absorptions before the onset of the fundamental transition.
ISSN: 09538984
DOI: 10.1088/0953-8984/17/43/005

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