Polyethylene transmission-filter gratings having 3 lines/mm were investigated in the far infrared. Their transmission was studied as a function of the orientation and the shape of the grooves. The intensity distribution of the light transmitted in zero order is discussed in terms of the scalar theory in the spectral region where the wavelength is small compared to the grating constant of the filter. The efficiency of transmission-and reflection-filter gratings is compared.
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Möller et al. (1965) studied this question.
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