Combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter and can be used to transform an initially Gaussian beam to a flat-top beam. /Photo: Courtesy of EKSPLA/
Space-variant waveplate for flat-top conversion is a space-variant phase retardation plate inscribed inside a bulk of fused silica glass by femtosecond laser pulses. Combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter (patent pending) and can be used to transform an initially Gaussian beam to a flat-top beam with efficiency of more than 50% of initial laser power.
Converter allows for on-the-fly adjustment of the beam shape from flat-top to a shape with a dip in the middle. Converter is compatible with high power ultrashort lasers.
Fig. 1 One-dimensional initial Gaussian function (dashed red line), 6-th order super-Gaussian function (solid red line) and calculated transmission function TX (gray solid line) /Photo: Courtesy of EKSPLA/
Fig. 2 Flat-top intensity distribution after converter. /Photo: Courtesy of EKSPLA/
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