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Completely passive nonlinear transmission system using a nonlinear absorbing medium and azobenzene films

A completely passive nonlinear transmission system is constructed using nonlinear absorption materials and azobenzene films. We experimentally demonstrated that in a pump-probe combination, the transmission of a linearly polarized probe beam through a photo-anisotropic material placed between crossed polarizers becomes nonlinear when a nonlinear absorbing medium is placed in the path of the pump beam. The nonlinear transmission of a reverse saturable material serves as pump beam and aligns the azobenzene molecules in a predetermined polarization direction. Thus the transmittance of the probe beam is enhanced at lower input intensities while it becomes clamped at high input intensities. The clamping level and threshold can be controlled by adjusting the concentration of the nonlinear absorbing medium.