  Electromagnetic interactions of the ground and first radial excited states of
$\eta$ and $\eta'$ mesons in the framework of the extended $U(3)\times U(3)$
NJL model are considered. The radial excitations are described with the help of
polynomial form factor of the second order over the inner quark momentum. The
solution of the $U_A(1)$ problem by means of 't Hooft interaction is taken into
account. For diagonalization of the free Lagrangian the $4\times4$ mixing
matrix is used. Two-photon decay widths of the ground $\eta$ and $\eta'$ meson
are found to be in a satisfactory agreement with the experiment. Predictions
for the two-photon decay widths of $\eta(1295)$ and $\eta(1475)$ are given. The
probabilities of eta meson production by two-photon mechanism in $e^+e^-$
collisions and of their photoproduction on electrons are calculated.
