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Persistent URL http://purl.org/net/epubs/work/32591687
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Record Id 32591687
Title Ultrafast laser beam shaping for material processing at imaging plane by geometric masks using a spatial light modulator
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Abstract We have demonstrated an original ultrafast laser beam shaping technique for material processing using a spatial light modulator (SLM). Complicated and time-consuming diffraction far-field phase hologram calculations based on Fourier transformations are avoided, while simple and direct geometric masks are used to shape the incident beam at diffraction near-field. Various beam intensity shapes, such as square, triangle, ring and star, are obtained and then reconstructed at the imaging plane of an f-theta lens. The size of the shaped beam is approximately 20 μm, which is comparable to the beam waist at the focal plane. A polished stainless steel sample is machined by the shaped beam at the imaging plane. The shape of the ablation footprint well matches the beam shape.
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Opt Lasers Eng 70 (2015): 1-5. doi:10.1016/j.optlaseng.2015.02.004 2015
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