P. Poornesh, P. Hegde, G. Umesh
Feb 1, 2010
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Optics and Laser Technology
Abstract
Abstract An experimental investigation of the third-order nonlinear optical properties of new poly {2 - { 5 -[3,4- ditetradecyloxy- 5 - (1,3,4 -oxadiazol- 2 -yl ) thiophen- 2 -yl ] - 1,3,4 -oxadiazol- 2 -yl } pyridine } ( P ) in tetrahydrofuran (THF) solution and in solid poly(methylmethacrylate) (PMMA) matrix, by Z -scan technique is reported. The Z -scan traces reveal that the composite films exhibit large negative nonlinear refractive index of the order 10 −10 esu. The excited-state absorption cross-section was found to be larger than the ground-state absorption indicating that the operating nonlinear process is reverse saturable absorption (RSA). The new polymer P exhibits good optical power limiting properties in the nanosecond regime in solution and as well in solid PMMA matrix.