  We consider a setup to detect stimulated photon-photon scattering using
high-power lasers. Signal photons are emitted from an overlap of the incoming
intense laser pulses focused in vacuum from three sides. We derive and justify
a general approximate analytical formula for the angular distribution and total
yield of such signal photons in terms of the parameters of the incoming pulses,
including their intensity, carrier frequencies, durations, focusing,
polarizations, mutual orientation and overlap. Using the obtained formula a
parametric study of the signal is carried out and optimization is performed.
