98-28E

Nonphonon contributions to Raman light scattering are investigated for the Hubbard and $t-J$ models. To construct the polarisability operator the microscopic approach is used, which is based on the operator expansion in the terms of the Hubbard operators, using t and J as a formal parameters of the expansion. Two different contributions to the dipole momentum are taken into account: one is connected with the nonhomeopolarity of filling of the electron states on a site, another - with the dipole transitions from the ground state to the excited ones. Analysing the expression for the scattering tensor, we can see that these two mechanisms give similar contributions. The dependence of the scattering intensity on the polarisation of the incident and scattered light is investigated.