Fig. 4
Typical experimental results of AGPM optical performance characterization. Left: radial profile of the image with an AGPM translated by 1 mm (off-axis PSF), and with three different centered AGPMs, showing low (AGPM-L9), median (AGPM-L13) or high (AGPM-L15) performance after initial etching. The vertical dashed line shows the limit of the disk on which the flux is integrated to compute the rejection ratio R. Right: corresponding images shown with a logarithmic scale.
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