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Two beamsplitters operating across the near-infrared (770-1050 nm) and mid-infrared (4-8 µm) spectral ranges are developed. For the first time, the beamsplitters based on thin-film materials combinations of ZnS/YbF 3 and Ge/YbF 3 are investigated. The multilayers operate at the Brewster angle of ZnSe substrate. There are no special temperature conditions. The dichroic coatings are designed, produced, and carefully characterized. Potentials of the ZnS/YbF 3 and Ge/YbF 3 thin-film material combinations are discussed based on analytical estimations, as well as on optical and non-optical characterization results. The ZnS/YbF 3 pair provides high reflectance in the near-infrared spectral range. The Ge/YbF 3 solutions exhibit very broadband reflection zones. The Ge/YbF 3 coatings are thinner and comprise fewer layers than ZnS/YbF 3 multilayers. Ge/YbF 3 pair has high potential for design and production of NIR-MIR coatings.

Comparative study of NIR-MIR beamsplitters based on ZnS/YbF3 and Ge/YbF3

Comparative study of NIR-MIR beamsplitters based on ZnS/YbF₃ and Ge/YbF₃