Abstract

Two bis-chalcone derivatives, 1,5-[di(4-methoxyphenyl)]penta-1,4-dien-3-one and 1,5-[di(4-chlorophenyl)]penta-1,4-dien-3-one were synthesized. Their SHG conversion efficiencies are reported to be 6.0 and 5.0 times that of urea and hyper polarizabilities are 9.9×10−30 and 10.2×10−30esu, respectively. The third-order nonlinear optical properties in PMMA matrix were studied by Z-scan technique using 7ns laser pulses at 532nm. The nonlinear refractive index γ, nonlinear absorption coefficient β, magnitude of effective third order susceptibility χ(3) and the coupling factor ρ have been investigated. The values obtained are of the order of 10−14cm2/W, 1.2cm/GW, 10−14esu and 0.2, respectively, which are comparable with the values obtained in stilbazoleum like dyes. The experimental investigation also shows that they are very interesting optical limiting materials and their optical limiting behaviour is mainly due to two photon absorption phenomenon.

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