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 632.8nm, we find as large as 0.06±0.005 average
refractive index change within the irradiated area.
© 2006 Optical Society of America
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