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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