Two-photon polymerization with diode lasers emitting ultrashort pulses with high repetition rate

G. Zyla1, N. Surkamp2, E.L. Gurevich1,3, C. Esen1, A. Klehr4, A. Knigge4, M.R. Hofmann2, and A. Ostendorf1

Published in:

Opt. Lett., vol. 45, no. 17, pp. 4827-4830 (2020).

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Abstract:

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