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Table 1

Measured profile parameters and simulated raw null depth for the four manufactured L-band AGPMs, and comparison with the optimal design.

Name Period Λ Fill F Depth h Angle α N theo

AGPM-L1 1.42 μm 0.35 4.2 μm 2.40° 0.0267
AGPM-L2 1.42 μm 0.36 3.6 μm 2.65° 0.0116
AGPM-L3 1.42 μm 0.44 5.8 μm 3.25° 0.0048
AGPM-L4 1.42 μm 0.41 4.7 μm 3.10° 0.0010

Optimum 1.42 μm 0.45 5.2 μm 2.95° 0.0005

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