Optical coating

Optical filters based on interference multilayer coatings are designed with application of a specially developed CAD system. Layers are created in high-performance vacuum equipment with automatic process control by resistance and electron-beam evaporation. We are able to produce solar blend cut-off and longpass filters in the middle infrared spectrum range.

The main assignment of the optical filters produced by “RIELTA” company:

• cut-off interference filters for own product line of PIR detectors providing high white light immunity level (WLI);
• longpass filters for flame detectors.

Main characteristics of the serial production:

1. Solar blend longpass filters

• substrate - silicon plates 0.3-0.5 mm thick with sizes - 7x7, 10x10, and 17x17 mm;
• operation range – up to 16 μm;
• cut-off wavelength - 5.5 microns; 6.5 microns; 7 μm; 7.5 μm;
• suppression of infrared radiation - not worse than 99.95%;
• transmission of infrared radiation - 85-90%;
• mechanical strength and resistance to climatic factors - according to Russian Standard 3-1901-95;
• WLI>6500 lux

2. Band-pass filters for hot СО2 emission line

• substrate - silicon plates 0.3-0.5 mm thick with sizes - 7x7, 10x10 and 17x17 μm;
• operation range – up to 8μm; • cut-off wavelength - 4 μm; 4.4 μm; 5 μm;
• suppression of infrared radiation - not worse than 75 - 85%;
• transmission of infrared radiation - 85-90%; • transmission bandwidth – 160 – 190 nm
• mechanical strength and resistance to climatic factors - according to Russian Standard 3-1901-95;

Dielectric optical coatings production possibilities:

• cutting filters,
• interference and band-pass filters,
• antireflection coatings for optical parts made of various materials,
• mirrors and beam splitters,
• other optical coatings upon customer request.

CONTACTS

Phone/fax: +7 (812) 498-19-71, +7 (812) 703-13-63
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