Two-photon polymerization of photosensitive resins initiated by femtosecond laser pulses has recently been demonstrated as a very powerful technique for the fabrication of three-dimensional microstructures.1,2 When tightly focused into the volume of a liquid resin (which is transparent in the infrared), femtosecond laser pulses can initiate two-photon polymerization and produce structures with resolution better than 0.2 μm.2

© 2002 Optical Society of America

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