  Uniaxial anisotropy in nonlinear birefringent crystals limits the efficiency
of nonlinear optical interactions and breaks the spatial symmetry of light
generated in the parametric down-conversion (PDC) process. Therefore, this
effect is usually undesirable and must be compensated for. However, high gain
may be used to overcome the destructive role of anisotropy and instead to use
it for the generation of bright two-mode correlated twin-beams. In this work,
we provide a rigorous theoretical description of the spatial properties of
bright squeezed light in the presence of strong anisotropy. We investigate a
single-crystal and a two-crystal configuration and demonstrate the generation
of bright correlated twin-beams in such systems at high gain due to anisotropy.
We explore the mode structure of the generated light and show how anisotropy,
together with crystal spacing, can be used for radiation shaping.
