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We fabricated a 302 mm diameter low-pass filter made of alumina that has ananti-reflection coating (ARC) made with laser-ablated sub-wavelength structures(SWS). The filter has been integrated into and is operating with the MUSTANG2instrument, which is coupled to the Green Bank Telescope. The averagetransmittance of the filter in the MUSTANG2 operating band between 75 and 105GHz is 98%. Reflective loss due to the ARC is 1%. The difference intransmission between the s- and p-polarization states is less than 1%. Towithin 1% accuracy we observe no variance in these results when transmission ismeasured in six independent filter spatial locations. The alumina filterreplaced a prior MUSTANG2 Teflon filter. Data taken with the filter heat sunkto its nominal 40 K stage show performance consistent with expectations: areduction of about 50% in filters-induced optical power load on the 300 mKstage, and in in-band optical loading on the detectors. It has taken less than4 days to laser-ablate the SWS on both sides of the alumina disk. This is thefirst report of an alumina filter with SWS ARC deployed with an operatinginstrument, and the first demonstration of a large area fabrication of SWS withlaser ablation.

A Large Diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-Reflection Coating