Applied Surface Science, Vol.360, 833-839, 2016
Materials processing with superposed Bessel beams
We report experimental results of femtosecond laser processing on the surface of glass and metal thin film using superposed Bessel beams. These beams are generated by a combination of a spatial light modulator (SLM) and an axicon with >50% efficiency, and they possess the long depth-of-focus (propagation-invariant) property as found in ordinary Bessel beams. Through micromachining experiments using femtosecond laser pulses, we show that multiple craters can be fabricated on glass with single-shot exposure, and the 1+(1) superposed beam can reduce collateral damage caused by the rings in zero-order Bessel beams in the scribing of metal thin film. (C) 2015 Elsevier B.V. All rights reserved.
Keywords:Materials processing;Femtosecond laser;Spatial lightmodulator;Beam-shaping;Glass;Thin film solar cell