Abstract
Refractive index modification of pure poly(methyl methacrylate) (PMMA) is investigated as a function of pulse duration using femtosecond lasers at 800 and wavelength. It is observed that at , the refractive index is modified more efficiently as the pulse duration decreases below , whereas at , efficient index modification is accomplished with longer, pulses. Results suggest that three- and two-photon absorption is responsible for modification of pure PMMA at and , respectively. Repeated irradiation with short pulses of low laser fluence allows control of the photomodification via incubation, thus reducing bulk damage.
© 2008 Optical Society of America
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