Figure 3. SEM images of the laser-textured samples prepared in ambient
air. Blue arrows show the direction of scanning by laser beam. Direction
of polarization is marked with white arrows in the case of linear
polarization and with white circle in the case of circular polarization.
The morphology of the laser-textured surfaces prepared in ambient air is
shown on Fig. 3. The direction of scanning is shown by blue arrows, and
polarization direction is shown by white arrows. Changing scanning speed
with saving single pulse fluence led to formation of the periodic
submicron- and micron-sized ripples at low number of overlapped beams
(Fig. 3, 300 mm/s) and microgrooves at intermediate number of overlapped
beams (Fig. 3, 50 mm/s) and in principal can form the quasiperiodic
arrays of microspikes at high number of pulses and linear polarization
[19, 20]. In our case, at very low scanning speed, corresponding to
optimal conditions for the microspikes formation, i.e. at high number of
overlapped shots, the meshes started to deform due to accumulating heat
and destruction of wires. Because of this we limited our experiments
with 50 mm/s lowest speed.