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Optical absorption characteristics in thermally reduced Er:LiNbO3 crystals
- Source :
-
Optical Materials . Mar2006, Vol. 28 Issue 4, p453-460. 8p. - Publication Year :
- 2006
-
Abstract
- Abstract: Influence of thermal reduction on intrinsic (bipolarons), extrinsic (Er3+) defects and OH− groups in Er:LiNbO3 crystals, which were as-grown and VTE-treated (VTE: vapor transport equilibration) before being reduced, was studied by measuring the polarised or unpolarised optical absorption in visible and near infrared regions. A wide and strong band extending from the optical absorption edge up to the infrared region and peaking around 500nm (∼2.5eV), resulting from the absorption of reduction-induced bipolarons, is observed. Meanwhile, the thermal reduction also induces an additional, relatively much narrow absorption band around 370nm in a crystal whether it is Er-doped or undoped and whether it is congruent or originally VTE-treated. Both the 500nm and the 370nm bands show similar polarisation dependence. The thermal reduction treatment hardly influences Er3+ spectroscopic properties such as absorption amplitude, linewidth, peaking position and polarisation dependence. The original VTE effects on the spectroscopic properties of Er:LiNbO3 crystal are essentially retained still. The thermal reduction has a similar effect on the OH− absorption to a strong VTE treatment: the removal of the OH− groups contained in the crystal. [Copyright &y& Elsevier]
- Subjects :
- *CRYSTAL optics
*ERBIUM
*CRYSTALS
*CRYSTALLOGRAPHY
Subjects
Details
- Language :
- English
- ISSN :
- 09253467
- Volume :
- 28
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Optical Materials
- Publication Type :
- Academic Journal
- Accession number :
- 19127255
- Full Text :
- https://doi.org/10.1016/j.optmat.2005.03.009