Multi-element mesh interference filters for the infrared

G D Holah, Desmond Smith

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


This paper discusses the development of infrared filters of both lowpass and bandpass types for the wavelength region ?>40 µm. The design techniques of multilayer filters have been extended to mesh filters. Bandpass filters at wavelengths near 50 and 100 µm with bandwidths between 5% and 10% and up to 90% transmission have been made using either double-halfwave or Fabry-Perot systems. Lowpass filters of high performance, passband transmission 70% and rejection greater than 103 are shown with edges near 100 µm. Narrowband filters for the HCN laser line at 30 cm-1 are also shown.

Original languageEnglish
Article number309
Pages (from-to)496-509
Number of pages14
JournalJournal of Physics D: Applied Physics
Issue number3
Publication statusPublished - 1972


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