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Table 1

Grating parameters, expected and measured broadband rejection ratios at L-band (3.54.0 μm) and M-band (4.45.0 μm) for our AGPMs after fabrication.

w t h α Expected R Measured R Expected R Measured R
Name [μm] [μm] [degrees] (L-band) (L-band) (M-band) (M-band)

AGPM-L5 0.630 ± 0.015 4.90 ± 0.20 3.20 ± 0.20 302400 550 10130 80
AGPM-L6a 0.625 ± 0.015 4.57 ± 0.20 3.20 ± 0.20 201600 150 1050 30
AGPM-L7a 0.625 ± 0.015 4.82 ± 0.20 3.45 ± 0.20 201400 550 10110 N/A
AGPM-L8 0.645 ± 0.015 4.86 ± 0.20 3.45 ± 0.20 30270 50 1080 N/A
AGPM-L9b 0.750 ± 0.010 5.10 ± 0.05 2.45 ± 0.10 20110 30 1040 20
AGPM-L10b 0.630 ± 0.010 5.20 ± 0.05 2.10 ± 0.10 1040 20 70450 90
AGPM-L11b 0.650 ± 0.010 4.92 ± 0.05 2.22 ± 0.10 40670 70 110520 240
AGPM-L12b 0.650 ± 0.010 4.92 ± 0.05 2.22 ± 0.10 40670 70 110520 120
AGPM-L13b 0.590 ± 0.010 4.67 ± 0.05 2.45 ± 0.10 30250 110 70250 150
AGPM-L14c 0.615 ± 0.010 4.67 ± 0.05 2.45 ± 0.10 701860 370 50160 90
AGPM-L15 0.630 ± 0.010 4.67 ± 0.05 2.45 ± 0.10 1302300 630 40120 70

Notes.

(a)

Installed in the Keck/NIRC2 camera.

(b)

Chosen for grating tuning demonstration.

(c)

Installed in the LBT/LMIRCam camera.

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