The results of synthesis of the anti-reflection coatings for widely separated wavelengths based on the use of unequal layer thickness symmetric periods are discussed. The possibility of realization of the anti-reflection coatings at two or more widely separated wavelengths is shown.
Yury A. Pervak,
Ishtvan V. Fekeshgazi,
"Antireflection coatings for two widely separated wavelengths", Proc. SPIE 2253, Optical Interference Coatings, (4 November 1994); doi: 10.1117/12.192088; https://doi.org/10.1117/12.192088