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Appl Opt. 1967 May 1;6(5):893-6. doi: 10.1364/AO.6.000893.

Far infrared bandpass filters and measurements on a reciprocal grid.

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  • 1Physics Department, Fairleigh Dickinson University, Teaneck, New Jersey 07666, USA.


Transmittance and reflectance measurements on wirecloth and electroformed metallic meshes are presented in the region 0.01 <or= lambda/d <or= 5. The results were obtained under equal geometric optical conditions with a vacuum grating spectrometer. The measurements are used for the construction of a transmission bandpass filter in the wavenumber region nu > 18 cm(-1). In order to be able to construct a bandpass filter in the entire far ir, a reciprocal grid is investigated and found to be suitable as a transmission low pass filter characterized only by geometrical parameters.

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