Abstract
As a new research area, laser surface wettability modification brings new applications
for both laser and materials for industry. The picoseconds (10 ps) pulse laser surface
micro-processing over alumina covered aluminium is researched. In the experiment, 10-ps laser pulse
is employed and the energy threshold for different laser wavelength and repetition rate is measured.
At the repetition rate of 5 kHz, the energy thresholds are: 1 064 nm: 4.0 μJ/pulse, 532 nm: 2.8
μJ/pulse, and 355 nm: 4.2 μJ/pulse. Picoseconds pulse laser is demonstrated feasible in
surface scanning at industrial level.
© 2013 Chinese Optics Letters
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