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18 February 2009 Propagation of Gaussian beam in self-defocusing photovoltaic photorefractive nonlinear crystal of LiNbO3:Fe
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Abstract
We investigate experimentally the propagation of Gaussian beam in self-defocusing photovoltaic photorefractive nonlinear crystal of iron-doped lithium niobate. In steady-state, the propagating beam in the low-refractive-index optical channel written by the beam itself is affected mostly by linear diffraction and anisotropic divergence of the saturated negative lenslike effect. And the latter affects the incident beam with convergent wavefront much more than that with divergent wavefront. In the case of the incident beam with the convergent wavefront, the angular width of the spatial spectrum of the output beam decreases along with the size of the output beam. We believe that the phase-type spatial filtering of the funnel-type low-refractive-index optical channel written by the propagating beam itself causes the results.
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Dayun Wang, Simin Liu, Zhaohong Liu, Ru Guo, Chunfu Huang, Nan Zhu, Tao Song, Peide Zhao, and Yong Zhang "Propagation of Gaussian beam in self-defocusing photovoltaic photorefractive nonlinear crystal of LiNbO3:Fe", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72761M (18 February 2009); https://doi.org/10.1117/12.823888
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