  The Photon wave function Formalism provides an alternative description of
some quantum optical phenomena in a more intuitive way. We use this formalism
to describe the process of correlated Stokes--anti-Stokes Raman scattering. In
this process, two photons from a laser beam are inelastically scattered by a
phonon created by the first photon (Stokes processes) and annihilated by the
second photon (anti-Stokes process), producing a Stokes--anti-Sokes (SaS)
photon pair. We arrive at an expression for the two-photon wave function of the
scattered SaS photon pair, which is in agreement with a number of experimental
results.
