K. Naseema, K. V. Sujith, K. Manjunatha
Jul 1, 2010
Citations
0
Influential Citations
57
Citations
Journal
Optics and Laser Technology
Abstract
Abstract Three hydrazones, 2-(4-methylphenoxy)- N ′-[(1E)-(4-nitrophenyl)methylene]acetohydrazide (compound-1), 2-(4-methylphenoxy)- N ′-[(1E)-(4-methylphenyl)methylene]acetohydrazide ((compound-2) and N ′-{(1E)-[4-(dimethylamino)phenyl]methylene}-2-(4-ethylphenoxy) acetohydrazide(compound-3) were synthesized and their third order nonlinear optical properties were investigated using a single beam z-scan technique with nanosecond laser pulses at 532 nm. Open aperture data obtained from the three compounds indicates two photon absorption at this wavelength. The nonlinear refractive index n 2 , the nonlinear absorption coefficient β , the magnitude of the effective third order susceptibility χ (3) , the second order hyperpolarizability γ h and the coupling factor ρ have been estimated. The values obtained are comparable with the values obtained for 4-methoxy chalcone derivatives and dibenzylidene acetone derivatives. Among the compounds studied, compounds-1 and 3 exhibited the better optical power limiting behaviour at 532 nm. Our studies suggest that compounds-1, 2 and 3 are potential candidates for optical device applications such as optical limiters and optical switches.