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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Three-dimensional multi-photon direct laser writing with variable repetition rate.

Joachim Fischer, Jonathan B Mueller, Johannes Kaschke

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    Summary

    Investigating direct laser writing, this study reveals distinct photopolymerization mechanisms at high and low laser repetition rates. Linewidths, however, remained independent of repetition rate, challenging current theories.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Polymer Chemistry

    Background:

    • Multi-photon direct laser writing (DLW) is a key technique for 3D microfabrication.
    • The underlying photopolymerization mechanisms, such as two-photon absorption and avalanche ionization, are not fully understood.
    • The influence of laser repetition rate on these mechanisms is a critical area of investigation.

    Purpose of the Study:

    • To investigate the effect of laser repetition rate on photopolymerization during direct laser writing.
    • To differentiate between proposed initiation mechanisms (two-photon absorption, photoionization, avalanche ionization, heat accumulation).
    • To analyze the scaling of resulting linewidths with respect to experimental parameters.

    Main Methods:

    • Direct laser writing experiments were conducted across a wide range of laser repetition rates.
    • Experimental conditions were kept constant except for the repetition rate.
    • Non-linear absorption and linewidth measurements were performed.

    Main Results:

    • Different non-linearities were observed at high and low laser repetition rates, suggesting distinct initiation processes.
    • The observed non-linearities are consistent with the involvement of different photopolymerization mechanisms.
    • The scaling of linewidths was found to be independent of both laser repetition rate and the observed non-linearity.

    Conclusions:

    • Laser repetition rate significantly influences the photopolymerization initiation mechanisms in DLW.
    • The independence of linewidth scaling from repetition rate and non-linearity suggests a more complex process than currently modeled.
    • Further research is needed to fully elucidate the interplay between laser parameters and photopolymerization dynamics.