title: Two-photon polymerization with variable repetition rate bursts of femtosecond laser pulses.
abstract: We describe fabrication of microstructures by two-photon polymerization using bursts of femtosecond laser pulses. With the aid of an acousto-optic modulator driven by a function generator, two-photon polymerization is performed at variable burst repetition rates. We investigate how the time between the bursts of laser pulses influences the ultimate dimensions of lines written in a photosensitive resin. We observe that when using the same laser fluence, polymer lines fabricated at different burst repetition rates have different dimensions. In particular, the widths of two-photon polymerized lines become smaller with decreasing burst repetition rates. Based on the thermal properties of the resin and experimental writing conditions, we attribute this effect to localized heat accumulation.
authors: Technology and Applications Center, Newport Corporation, 1791 Deere Avenue, Irvine, California 92606, USA.
authors: Tommaso
authors: T
authors: Baldacchini
authors: Scott
authors: S
authors: Snider
authors: Ruben
authors: R
authors: Zadoyan