Abstract
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/YbF3 and Ge/YbF3 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/YbF3 and Ge/YbF3 thin-film material combinations are discussed based on analytical estimations, as well as on optical and non-optical characterization results. The ZnS/YbF3 pair provides high reflectance in the near-infrared spectral range. The Ge/YbF3 solutions exhibit very broadband reflection zones. The Ge/YbF3 coatings are thinner and comprise fewer layers than ZnS/YbF3 multilayers. Ge/YbF3 pair has high potential for design and production of NIR-MIR coatings.
Highlights
In the recent years, the mid-infrared (MIR) spectral range from 3 to 15 μm attracts more and more interest of chemists and biologists since most organic molecules exhibit fundamental vibrational and rotational modes in this range [1,2]
The multilayers operate at the Brewster angle of ZnSe substrate
Potentials of the ZnS/YbF3 and Ge/YbF3 thin-film material combinations are discussed based on analytical estimations, as well as on optical and non-optical characterization results
Summary
The mid-infrared (MIR) spectral range from 3 to 15 μm attracts more and more interest of chemists and biologists since most organic molecules exhibit fundamental vibrational and rotational modes in this range [1,2]. Harnessing MIR radiation in the laser systems demands high quality multilayer optical elements operating in the near-infrared (NIR) and in the MIR spectral ranges, so called NIR-MIR coatings. Such coatings are used to split or combine the laser beams into more powerful near-infrared and less powerful mid-infrared components. The low mechanical stress is crucial in order not to deform the laser beam wave front of the entire laser system These specifications affects the choice of thinfilm materials and design structures since the coatings operating in the MIR range may contain thick layers, and adhesion or/and stress problems may arise at some combinations of substrate/thin-film materials
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