Common anti-reflective films on Sulfide Zinc(ZnS) Substrate has low hardness and poor protective effect, thus cannot meet the requirement of harsh environment. Composite anti-reflective and protective films with ZnS, YbF3 and DLC films are developed. This Diamond-like Carbon(DLC) films with high infrared transmittance and high hardness is developed by quasi-molecule laser in vacuum. The deposition parameters and performance of DLC and YbF3 films are optimized. The adhesion performance of the composite films is improved by introducing optimized adhesive coating, optimized thickness of DLC films and so on. The composite films has many advantages such as high transmittance in far IR region, good adhesion, anti-scratch performance, it also can pass boil water test, tape adhesion test and scrub test.
When laser propagate in the atmosphere, due to aerosol scattering and absorption, laser energy will continue to decline, affecting the effectiveness of the laser effect. Based on the Monte Carlo method, the relationship between the photon spatial energy distributions of the laser wavelengths of 10.6μm in marine, sand-type, water-soluble and soot aerosols ,and the propagation distance, visibility and the divergence angle were studied. The results show that for 10.6μm laser, the maximum number of attenuation of photons arriving at the receiving plane is sand-type aerosol, the minimal attenuation is water soluble aerosol; as the propagation distance increases, the number of photons arriving at the receiving plane decreases; as the visibility increases, the number of photons arriving at the receiving plane increases rapidly and then stabilizes; in the above cases, the photon energy distribution does not deviated from the Gaussian distribution; as the divergence angle increases, the number of photons arriving at the receiving plane is almost unchanged, but the photon energy distribution gradually deviates from the Gaussian distribution.
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