Request InfoLake Shore CryotronicsFar-IR and terahertz bandpass and narrow-bandpass filters with center wavelengths from 15 to 200 μm have been released by Lake Shore Cryotronics Inc. Patterned cross-shaped holes allow transmission of light at specific wavelengths. Center wavelength transmission of up to 80% with tolerance of ±0.1 μm and out-of-band transmission down to 0.5% have been achieved. The 1-mm-deep filters can be integrated into existing filter wheels, cryostats or compact optical instruments. They deliver stable and repeatable performance down to 4 K. 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