Far-infrared filters utilizing small particle scattering and antireflection coatings.
High transmission, low pass scatter filters for blocking at wavelengths from 3.5 microm to 50 microm and singlelayer antireflection coatings for optical materials used in the 25-microm-300microm region of the spectrum are described. The application of both techniques to liquid-He-cooled filters permits the construction of efficient low pass and medium-width band pass filters for use throughout the far infrared.
Armstrong
K R
KR
Low
F J
FJ