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Proceedings Paper

Nonlinear forms of laser beam propagation in a photopolymerizable medium
Author(s): Ana B. Villafranca; Kalaichelvi Saravanamuttu
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Paper Abstract

Detailed studies of the dynamics of a continuous wave, visible laser beam propagating in a photopolymerizable organosiloxane are presented. Experiments carried out at intensities ranging across ten orders of magnitude (3.2 x 10-5 Wcm-2 to 12732 Wcm-2) revealed three types of nonlinear behaviour. In the low-intensity regime, the beam self-trapped and exhibited complex oscillatory behaviour, which signified the excitation of high-order modes in its self-inscribed waveguide during self-trapping. This is consistent with previous theoretical predictions of self-trapping in 1-photon systems including photopolymers. In the mid-intensity regime, the beam underwent spatial self-phase modulation, which elicited spatial diffraction rings. While this phenomenon has been observed in Kerr, liquid crystals and absorptive materials, it has until now been neither theoretically nor experimentally observed in photopolymers. Rapid and large refractive index changes induced in the high-intensity regime caused filamentation of the beam. These studies provide a comprehensive overview of nonlinear light propagation in photopolymers.

Paper Details

Date Published: 12 February 2009
PDF: 8 pages
Proc. SPIE 7213, Organic Photonic Materials and Devices XI, 72130T (12 February 2009); doi: 10.1117/12.809081
Show Author Affiliations
Ana B. Villafranca, McMaster Univ. (Canada)
Kalaichelvi Saravanamuttu, McMaster Univ. (Canada)

Published in SPIE Proceedings Vol. 7213:
Organic Photonic Materials and Devices XI
Robert L. Nelson; François Kajzar; Toshikuni Kaino, Editor(s)

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