  The formalism of (${\vec \gamma},{\vec N}N$) reactions is given where the
incident photon is polarized and the outgoing nucleon polarization is detected.
Sixteen structure functions and fifteen polarization observables are found in
the general case, while only eight structure functions and seven polarizations
observables survive in coplanar kinematics. Numerical examples are presented
for the $^{16}$O($\gamma,pn$) and $^{16}$O($\gamma,pp$) reactions. The
transitions to the ground state of $^{14}$C and $^{14}$N are calculated in a
model where realistic short-range and tensor correlations are taken into
account for the $pn$ pair, while short-range and long-range correlations are
included in a consistent way for $pp$ pairs. The effects of the one-body and
two-body components of the nuclear current and the role of correlations in
cross sections and polarizations are studied and discussed.
