Abstract

Filters which serve as dichroic beam dividers are useful for certain types of far-infrared photometer. We have used inductive cross metal mesh as reflective coatings on solid dielectric Fabry-Perot etalons to produce dichroic filters with quality factors in the range 3 < Q < 10. These filters reflect strongly at frequencies below the bandpass and retain their well-defined bandpass at angles of incidence as large as 45°. They have been used to make an efficient far-infrared dichroic photometer with six frequency bands between 10 and 100 cm−1.

© 1985 Optical Society of America

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