Villarroel J, Carnicero J, Luedtke F, Carrascosa M, García-Cabañes A, Cabrera J M, Alcazar A, Ramiro B
Departamento de Física de Materiales C-IV, Universidad Autónoma de Madrid, E-28049, Spain.
Opt Express. 2010 Sep 27;18(20):20852-61. doi: 10.1364/OE.18.020852.
Photorefractive optical damage of single beams in LiNbO(3) crystals is analyzed within a framework of two photoactive centres (Fe(2+)/Fe(3+) and Nb(Li) (4+)/Nb(Li) (5+)). It compares model simulations and significant experimental measurements in LiNbO(3) waveguides. A good agreement is found in the performed comparisons: photovoltaic currents, refractive index changes and, especially relevant, in degraded beam-profiles. The progress of the degraded wavefront has been simulated by implementing a finite-difference beam-propagating method which includes the model equations. These results, together with previous ones on grating recording, provide a comprehensive, satisfactory explanation of most important questions on photorefractive optical damage.
在两个光活性中心（Fe(2+)/Fe(3+)和Nb(Li)(4+)/Nb(Li)(5+)）的框架内分析了LiNbO(3)晶体中单光束的光折变光学损伤。它比较了LiNbO(3)波导中的模型模拟和重要的实验测量结果。在进行的比较中发现了很好的一致性：光生伏打电流、折射率变化，尤其相关的是在退化的光束轮廓方面。通过实施包含模型方程的有限差分光束传播方法模拟了退化波前的进展。这些结果与先前关于光栅记录的结果一起，对光折变光学损伤的最重要问题提供了全面、令人满意的解释。
