Lake Shore Far IR Band Pass Filters Specified for NASA’s FORCAST Instrument Mar 24, 2009

Lake Shore Cryotronics, Inc.’s far-infrared, metal-mesh band pass filters have been successfully tested and approved
for use on NASA’s FORCAST instrument, part of the SOFIA science center. The filters employ frequency selective
surface technology based on thin film, metal-mesh structures enabling thermal and mechanical properties—even at cryogenic and elevated temperatures. They will not delaminate under harsh conditions, have peak
transmission up to 85%, and are radiation hard.

Employing frequency selective surface technology, they are designed with patterned, cross-shaped, and other resonant opening geometries allowing transmission of light at specific wavelengths. Multiple 25 mm diameter filters were supplied to Cornell with center wavelengths (CWLs) of 24.4, 33.4 and 38.8 μm.

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