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Recently, the synthesis of the multi-layered optical systems gained large enough development, successes of these researches influence both on development of optics and other branches of science and technique. Presently, it is possible to get the interference filters of any type for all of optical range with the set spectral descriptions. To the one of the most topical problems now is design of narrow-band filters in optical instrument engineering, as industry of application is very wide, this is astrophysics, chemistry, medicine, materials science, engineering [1 – 3]. As is generally known, one of basic characteristics of narrow-band filters is consider the size of sidebands suppression (attenuation range) – size of spectral interval in which a transmission is low (0.1%) [4]. However, it is enough difficultly to synthesize the interference narrow-band filter with the wide sidebands suppression without substantial losses for a working wavelengt . Traditionally this problem is decided the using additional short-wave and long-wave filters [5]. This complicated the construction of filter substantially increased absorption, and also decreased of transmission for working wavelength. All of it resulted in an attempt to construct or optimize a filter so that to sidebands suppression of transmission and get the curve of transmission without the substantial losses of absorption for working wavelength. In papers [6 7] we offered the structure of the narrow-band interference filter, that consisted only of five layers. In this filter substrate was basis of filter and simultaneously the basic layers of all of the

IP2 - Narrow Band Interference Filter for the IR-Spectrum Region