Beam shaping with high energy utilization anduniformity using gradient orthogonal gratings
2021
A flattop beam is useful in ultrafast laser processing. A laser beam
shaping method for high energy utilization and uniformity is presented
using a complex hologram displayed on a spatial light modulator. The
hologram consists of a geometric mask, an external blazed grating, and
internal gradient orthogonal gratings. The gradient orthogonal gratings
can change the incident light energy distribution and obtain flattop beams
with high energy utilization. Experimental results show that the presented
method can obtain an arbitrary geometric shape with a steep edge and high
uniformity. Meanwhile, the bigger the geometric mask size, the higher the
energy utilization will be, and it is up to 78.70%.
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