Z-scan study of nonlinear absorption in reduced LiNbO{sub 3} crystals
- RPC Optolink, Sosnovaya al., d. 6A, Str. 2, NPL-3-1, Zelenograd, Moscow 124489 (Russian Federation)
- LMOPS, Lorraine University and Supelec, 2 rue E. Belin, 57070 Metz (France)
The nonlinear absorption (NLA) was studied by open-aperture Z-scan experiments in the chemically reduced nominally pure LiNbO{sub 3} crystals at cw-illumination with the red (644 nm) and green (514.5 nm) laser beams. The magnitude of the measured NLA is considerably different from the reported Z-scan results obtained in as-grown LiNbO{sub 3}. The positive sign of NLA obtained with the red light has been related to the generation of the small bound polarons absorbing in red and near-IR ranges. Application of green light results in the light-induced transparency, i.e., the Z-scan traces show negative sign of NLA. Intensity dependence of Z-scan traces allows for conclusion that the photo-induced dissociation of small Nb{sub Li}{sup 4+}:Nb{sub Nb}{sup 4+} bipolarons and sequent generation of small polarons gives the dominating contribution to the nonlinear optical absorption in reduced crystals with a large bipolarons concentration.
- OSTI ID:
- 22036874
- Journal Information:
- Journal of Applied Physics, Vol. 111, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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