Laser-Induced Periodic Surface Structures (LIPSS) can be produced using ultra-short (fs) pulsed lasers. The typical Gaussian profile of a single mode ultrafast fiber laser is not ideal, as the fluence across a spot varies. Laser beam shaping can reform the output spot into a square or rectangular shape with a flat-top profile, tailored to the fluence requirements of the application. We present initial results, surface nanotexturing of stainless steel at a rate of 6.8 cm2 s -1 and efficiency of 0.38 cm2 s −1 W−1 with a 20 W average power laser. Further optimisation will allow the full output power range of the laser to be used to maximise throughput and efficiency. Beam shaping also provides improvements to black marking throughput, where the typical processing speed with a Gaussian spot is less than 0.04 cm2 s −1 while shaped beam increases the productivity up to 0.44 cm2 s −1 .
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