Abstract
Photoinduced changes in a Sudan I doped PMMA thin film were investigated. The dependence of photoinduced birefringence of the thin film on light intensity was studied, with a continuous wave (CW) 532 nm laser as pump light and a CW 650 nm laser as probe light. For all the light intensities (100–1000 mW/cm 2 ), the thin film possessed large photoinduced birefringence (Δ n ~ 10 −4 ). With a CW 532 nm laser at relatively low light intensity, a reversible polarization hologram has been recorded in the thin film. Moreover, Z-scan measurements showed that the thin film possessed large nonlinear refractive index (−7.93 × 10 −5 cm 2 /W) and nonlinear absorption coefficient (−5.50 W/cm) under a CW 532 nm excitation.
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