Abstract

Thin-film Al filters are very popular owing to their high transmittance in the wavelength range of 17–67 nm and low transmittance in the visible and near-UV regions; however, they are prone to oxidation. The amorphous ${{\rm Al}_2}{{\rm O}_3}$ layers on the Al surfaces have much smaller transmittance than the bulk Al material; therefore, they strongly influence the total transmittance of the filter. This paper not only provides the transmittance of very old Al filters but also maps the transmittance development of Al filters over two years since their delivery (in 2016) in an uncontrolled atmosphere.

© 2021 Optical Society of America

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Data Availability

The data belonging to attenuation measurements were extracted from our electronic workbook, the structure of which is hardly understandable to anybody else. In contrast, the data underlying recent PES measurements, though not available at this time, may be obtained from the authors upon reasonable request.

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