Two-photon absorption-based optical limiting in 2-(2-methoxybenzyllideneamino)-5-methylphenylmercuric chloride-doped PMMA film

The synthesis and the linear and optical limiting properties of a 2-(2-methoxybenzyllideneamino)-5-methylphenylmercuric chloride-doped poly(methylmethacrylate) (PMMA) film are described. The sample exhibits strong optical power limiting under continuous wave (cw) laser at the experimental wavelength. The mechanisms for the optical limiting were discussed on the basis of the twophoton absorption involved in the process. The nonlinear absorption coefficient beta of the sample is estimated and its value is found to be 67 x 10(-2) cm/W. Our study indicated that the investigated compound-doped PMMA film is a potential candidate for optical limiting applications in low power cw regime.