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. A new five-layer structure of the dielectric interference filter for the infra-red region of spectrum is investigated. The main spectral parameters of such a narrow-band filter are determined. The dependence of the transmission band half-width on the thickness of a dividing layer in this system is investigated. It is shown that, in the case of the application of PbTe, GeTe, and SnTe layers with a given thickness; their number can be limited to five at providing the necessary selectivity of the filter: practically the 100-% transmission at the resonance frequency and 0.005 % outside the transmission band. Keywords: interference filter, narrow-band filter. Manuscript received 05.06.07; accepted for publication 07.02.08; published online 31.03.08. 1. Introduction It is known that the interference filters are well perspective as for their application in optical devices and actually determine the efficiency and reliability of an apparatus [1, 2]. Therefore, these filters must meet such requirements as the maximum passing energy in the transmission band and the minimum passing energy outside it. This characteristic and the transmission band width determine the least number of layers formed by a simple and known technological procedure that must provide a high reliability of filters. It should be noted that the primary purpose of developers is to provide the maximal selectivity and operational stability of interference filters. As is well known, the multilayer thin-film dielectric systems including the layers with optical thickness multiple to λ

Selective unequal-thickness thin-film filters for IR spectral region