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Super UV AR coating

UV AR coating is quite difficult than normal visible AR coating because of the absorption. Due to the short wavelength, any tiny defects in the coating layer may cause coating absorption.
Simphoton engineers doing hard working to improve our UV coating technology and reduce the coating absorption. After many times experiments, we finally develp the super UV AR coating. The absoroption at 300-400nm wavelength is on the same level as visible AR coating. Even for 266nm, the absorption can be controled less than 0.5%.
The optics with super UV AR coating has abviously higher damage threshold and longer life time than the normal UV AR coating.
Transmission Test Result

UV grade Fused silica substrates, Both sides super UVAR coated @250-330nm

T>99%@260-310nm, Absorption <0.5%

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