Photorefractive saturable Kerr-type nonlinearity in photovoltaic crystals

被引:72
|
作者
Bian, S [1 ]
Frejlich, J [1 ]
Ringhofer, KH [1 ]
机构
[1] UNIV OSNABRUCK, DEPT PHYS, D-49069 OSNABRUCK, GERMANY
关键词
D O I
10.1103/PhysRevLett.78.4035
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We deduce the equation describing the refractive index perturbation in photovoltaic photorefractive crystals produced by the incidence of a focused laser beam and an incoherent uniform illumination. Under short-circuit conditions the equation shows a saturable Kerr-type nonlinearity that can be controlled by the intensity of the uniform background illumination. Z-scan experiments in an iron doped lithium niobate crystal are carried out using a 532 nm wavelength laser line to evaluate its self-lensing properties and to measure its photovoltaic field.
引用
收藏
页码:4035 / 4038
页数:4
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