  Microlasers are of ample interest for advancing quantum chaos studies at the
intersection of wave dynamics and geometric optics in resonators. However, the
mode structures of three-dimensional microlasers without rotational symmetry
remain largely unexplored due to fabrication limitations. Previous studies of
such cavities revealed lasing modes localized on periodic orbits exclusively
confined to a single plane. In this work, we report on the characterization of
pyramidal, polymer-based microlasers and demonstrate that the lasing modes are
localized on a genuine three-dimensional periodic orbit. The consequences on
the laser features are further discussed, in particular stability and
polarization issues.
