3D structures produced in SZ2080 and PDMS without photo-initiators at 515 nm,
200 kHz irradiation: an array of pyramids fabricated in SZ2080 using NA = 0:95 focusing,
1.75 nJ pulse energy (0.35 mW) and a 0.2 mm/s sample translation velocity. For details, see R. Buividas
et al. Opt. Mater.
Express 3, 1674-1686 (2013).