Abstract
A number of 355-nm Al2O3/MgF2 high-reflectance (HR) coatings were prepared by electron-beam evaporation. The influences of the number of coating layers and deposition temperature on the 355-nm Al2O3/MgF2 HR coatings were investigated. The stress was measured by viewing the substrate deformation before and after coating deposition using an optical interferometer. The laser-induced damage threshold (LIDT) of the samples was measured by a 355-nm Nd:YAG laser with a pulse width of 8 ns. Transmittance and reflectance of the samples were measured by a Lambda 900 spectrometer. It was found that absorptance was the main reason to result in a low LIDT of 355-nm Al2O3/MgF2 HR coatings. The stress in Al2O3/MgF2 HR coatings played an unimportant role in the LIDT, although MgF2 is known to have high tensile stress.
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Zhan, M., Zhao, Y., Tian, G. et al. Stress, absorptance and laser-induced damage threshold properties of 355-nm HR coatings. Appl. Phys. B 80, 1007–1010 (2005). https://doi.org/10.1007/s00340-005-1808-3
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DOI: https://doi.org/10.1007/s00340-005-1808-3