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Abstract
This paper describes optical properties of thin electroformed metallic meshes in detail. Since the transmittance shows the bandpass character around the wavelength near the grid constant, metal mesh can be used as a bandpass filter. The reflectance is high in the wavelength region longer than three times the grid constant and the absorptivity is very low. These optical properties are suitable for reflectors of the Fabry-Perot Interferometers (FPI's) for the far infrared. Authors fabricated two types of FPI's; flxed type and tunable type. The absorption spectra of atmospheric water vapour between 100 and 400 µ and CO gas between 350 and 650 µ were scanned with the tunable FPI. Resultant resolving power of about 20 was obtained at 250 µ. Moreover, light flux which a FPI can utilize in the limited area of the light source and the detector was discussed.
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