Energy absorbing and energy spreading optical limiting action of 2-amino 5-nitropyridinium derivatives

Abstract By Nd:YAG green laser driven Z-scan experiment, nonlinear optical properties of 2-amino 5-nitropyridinium derivatives (2A5NPCl and 2A5NPBr) are studied. Both the samples exhibit genuine 2 PA induced electro-optic based optical limiting action process under pulsed (5 ns, 100 μJ) mode. And they display self-defocusing promoted thermo-optic based optical limiting action under continuous wave (50 mW) mode. NLO coefficients and thermodynamic properties of 2A5NPBr is higher than 2A5NPCl. Results show 2A5NPBr molecular liquids are superior for energy absorbing and energy spreading optical limiting applications to prevent the laser damages from nano pulsed and CW green laser excitation.