Abstract

A chemically modified poly(fluorene-alt-benzothiadiazole) (PFBT) polymer film is reported to exhibit high two-photon absorbing capability and chemical/physical stability upon the action of high-power laser pulses of 780nm wavelength and 160fs duration. A nonlinear transmission measurement is conducted by varying the input intensity from 20 to 600GW/cm2, the corresponding nonlinear transmission of a 70μm thick film is reduced from 0.8 to 0.18, indicating a superior optical limiting behavior. In the meantime, intensity fluctuation of laser pulses can be significantly reduced after passing through the same film sample. Based on the intensity-dependent nonlinear attenuation mechanism, a straightforward optical reshaping effect on spatio-temporal profiles of the laser pulses has also been demonstrated.

© 2011 Optical Society of America

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