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Multi imaging-based beam shaping for ultrafast laser-material processing using spatial light modulators
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DOI：10.1016/j.optlaseng.2018.09.002.png)
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An imaging based beam shaping technique combined with parallel beam processing has been demonstrated. Binary and intensity masks have been designed and applied on phase only spatial light modulator (SLM) to shape the input laser beam in the desired profile and intensity distribution. A second SLM with a computer generated hologram(CGH) applied was used to split the incident picosecond laser beam. Hence, the laser beam was effectively converted to required target shape, intensity distribution and a separated pattern then reconstructed at the image plane of a focusing lens. The machined footprints on a polished Titanium (Ti6Al4V) substrate accurately match the desired beam in shape and depth distribution.
Keyword:
Laser beam shaping
Laser parallel beam processing
Spatial light modulator
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