Abstract
The third-order optical nonlinear properties of a side-chain azobenzene copolymer have been studied using the Z-scan technique at 532 nm with 35 ps pulses. The mechanism has been described in detail via an optical–optical isomerization. The two-photon absorption coefficient β was measured to be 234 cm/GW and the nonlinear refraction coefficient γ was measured to be −104×10 −4 cm 2/GW at the on-axis peak intensities I 0 of 0.5623 GW/cm 2. It is found that β and γ decreased significantly with increasing I 0, and the faster optical responses of β and γ should prove valuable in optical signal processing devices.
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