Abstract
Symmetrical echelette gratings used in transmission are useful high-pass filters in the far-infrared region. Precise transmission measurements on these filters have been made in the 400 cm −1-50 cm −1 spectral range with a FIS-3 spectrophotometer. Scalar theory justifies experimental results, apart from some significant discrepancies which are related to the dichroism of the echelettes. Polarization effects have been studied in detail, showing the presence of transmission anomalies similar to the Wood anomalies in reflection echelettes. The use of a pair of crossed echelettes gives a definite improvement in the extinction at wavelengths shorter than the cut-off.
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