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4 December 2012 Spectroscopic investigation of fs laser-induced defects in polymer and crystal media
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We investigated formation of defects in four polymers namely Poly (methylmethacrylate) [PMMA], Poly dimethylsiloxane [PDMS], Polystyrene [PS], and Polyvinyl alcohol [PVA] and crystal media such as Lithium Niobate [LiNbO3]. Spectroscopic studies of the femtosecond (fs) laser modified regions were systematically performed after fabricating several gratings and micro-channels. We observed emission from the fs laser modified regions of these polymers when excited at different wavelengths. Pristine polymers are not paramagnetic, but exhibited paramagnetic behavior upon fs irradiation. LiNbO3 (LNB) crystal has not shown any defect formation upon laser irradiation. Confocal micro-Raman studies were also performed to establish the formation of defects.
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Deepak Kallepalli Lakshmi Narayana, Soma Venugopal Rao, and Desai Narayana Rao "Spectroscopic investigation of fs laser-induced defects in polymer and crystal media", Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 853004 (4 December 2012);

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