We present here some estimates of the attenuation of ruby laser radiation in a non-linearly absorbing two-chamber gas cell. The calculations that we have made refer to the case when one of the chambers contains molecular iodine while the other one the potassium vapor as admixtures. Transmittance of such a cell is shown to depend on the succession in which the chambers are placed along the laser beam due to the differences in mechanisms of non-linear interaction between these gases and laser radiation.