The mechanisms of refractive index change in poly(methyl methacrylate) by frequency doubled femtosecond laser pulses are investigated. It is demonstrated that positive refractive index modificaton can be caused by a combination of depolymerization and crosslinking.
© 2009 Optical Society of America
Original Manuscript: September 24, 2009
Manuscript Accepted: November 13, 2009
Published: December 24, 2009
Alexandra Baum, Patricia J. Scully, Walter Perrie, Dun Liu, and Valerio Lucarini, "Mechanisms of femtosecond laser-induced refractive index modification of poly(methyl methacrylate)," J. Opt. Soc. Am. B 27, 107-111 (2010)