  We suggest a novel optical parametric generator (OPG) in which one of the
down-converted beams is spontaneously generated along the Poynting vector of
the pump beam. In this configuration, the generation takes advantage of the
walk-off of the extraordinary pump rather than being degraded by it. As a
result the generated beams, signal and idler, are bright, due to a high
conversion efficiency, spatially nearly single-mode, due to the preferred
direction of the Poynting vector, tuneable over a wide range of wavelengths,
and broadband. The two beams are also correlated in frequency and in the photon
number per pulse. Furthermore due to their thermal statistics these beams can
be used as a pump to efficiently generate other nonlinear processes.
