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Opt Express. 2006 Nov 27;14(24):11901-9.

Large refractive index change in silicone-based and non-silicone-based hydrogel polymers induced by femtosecond laser micro-machining.


A Ti:Sapphire femtosecond laser with a pulse energy of 1.3 nJ at a 93 MHz repetition rate has been used to micro-machine optical gratings inside several silicone-based and non-silicone-based hydrogel polymers. By measuring the diffraction efficiency of the gratings at 632.8 nm, we find as large as 0.06+/- 0.005 average refractive index change within the irradiated area.

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