THz Band Pass Filters are meant to transmit the radiation in the wavelength range from 20 to 3000 μm. The filters are fabricated from thin metal foil with holes. Configuration of the holes depends on the required wavelength.

The filters settle the problems of quasioptical filtration of radiation in THz range. They also permit to get high degree of monochromatization while the aperture ration of device is also high.
The Band Pass Filters are highly recommended to use when it is important to have high spectral resolution with high aperture ratio as well as small overall dimensions and weight of the device.

50. Any pass band in the range from 0.1 to 15 THz (from 3000 to 20 μm);
50. High transmittance  (60-90%) in pass band;
50. Low transmittance  (<4%) in stop bands;
50. Available to be used in cryostats and electro-optic assemblies;
50. Damage threshold (in the range from 0.1 to 15 THz)  - 65-100 W/cm2;
50. Mounted in holders.