Two-photon polymerization with diode lasers emitting ultrashort pulses with high repetition rate
Opt. Lett., vol. 45, no. 17, pp. 4827-4830 (2020).
Copyright © 2020 Optical Society of America. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the Optical Society of America.
In this Letter, we investigate the resolution of two-photon polymerization (2PP) with an amplified mode-locked external cavity diode laser with adjustable pulse length and a high repetition rate. The experimental results are analyzed with a newly developed 2PP model. Even with low pulse peak intensity, the produced structural dimensions are comparable to those generated by traditional 2PP laser sources. Thus, we show that a compact monolithic picosecond laser diode without amplification and with a repetition rate in the GHz regime can also be applied for 2PP. These results show the high application potential of compact mode-locked diode lasers for low-cost and compact 2PP systems.
1 Applied Laser Technologies Ruhr-University Bochum, Bochum, Germany
2 Photonics and Terahertz Technology, Ruhr-University Bochum, Bochum, Germany
3 Laser Center (LFM), University of Applied Sciences Münster, Steinfurt, Germany
4 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany