Abstract
In this work we study the temperature effect on photo-induced THG change in azo-polyurethane homopolymer and azo guest-host polymer thin films. The study can shed light on the molecular motions associated with angular hole burning (AHB) and angular redistribution (AR) at different temperatures. In the experiment a Q-switched Nd:YAG laser (1064 nm, 7 ns pulse at 10 Hz) was used as the light source. The second harmonic of the fundamental was used as the pump beam. A small amount of the fundamental was used as a probe to generate THG from the samples. Fig. 1 shows the temperature effect on the decay of the photoinduced THG of the disperse-red1-PMMA (DR1-PMMA) thin film in fame (a), and of the polyurethane homopolymer thin film in frame (b), for the pump and probe co-polarized configuration. Solid lines are the best fit to the data using the bi-exponential function:
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