Abstract
A high-pass transmission filter is described which has very small transmission (e.g. 10−10) on the low-frequency side. It consists of a perforated metal foil. The perforations act as cutoff waveguides for the low-frequency radiation.
A very steep filter slope (e.g. 1000 db/octave) paired with good transmission at high frequencies suggests use of this filter e.g. for purifying infrared laser beams from (even closely spaced) low-frequency components.
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Keilmann, F. Infrared high-pass filter with high contrast. Int J Infrared Milli Waves 2, 259–272 (1981). https://doi.org/10.1007/BF01007034
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DOI: https://doi.org/10.1007/BF01007034