Spectroscopic investigation of fs laser-induced defects in polymer and crystal media

Kallepalli Lakshmi Narayana Deepak (1) , Soma Venugopal Rao , Desai Narayana Rao

1 LP3 - Laboratoire Lasers, Plasmas et Procédés photoniques

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.

Domaines: Optique / photonique

Kallepalli Lakshmi Narayana Deepak, Soma Venugopal Rao, Desai Narayana Rao. Spectroscopic investigation of fs laser-induced defects in polymer and crystal media. LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2012, 2012, Unknown, Unknown Region. ⟨10.1117/12.975812⟩. ⟨hal-01418592⟩