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Article Dans Une Revue Journal of Applied Physics Année : 2012

Z-scan study of nonlinear absorption in reduced LiNbO3 crystals

Sergey M. Kostritskii
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Résumé

The nonlinear absorption (NLA) was studied by open-aperture Z-scan experiments in the chemically reduced nominally pure LiNbO3 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 LiNbO3. 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 NbLi 4þ:NbNb4þ bipolarons and sequent generation of small polarons gives the dominating contribution to the nonlinear optical absorption in reduced crystals with a large bipolarons concentration.
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Dates et versions

hal-00699510 , version 1 (21-05-2012)

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Sergey M. Kostritskii, Michel Aillerie. Z-scan study of nonlinear absorption in reduced LiNbO3 crystals. Journal of Applied Physics, 2012, 111, pp.103504. ⟨10.1063/1.4716470⟩. ⟨hal-00699510⟩
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