METHOD OF MAKING KINOFORM PROFILE ON WORKING SURFACE OF LENS Russian patent published in 2010 - IPC G02B3/08 G02B1/12 

FIELD: physics.

SUBSTANCE: kinoform profile on the working surface of a lens is made by removing material of the lens through ion etching with formation of concentric zones. Layers of material of the lens of equal thickness are removed successively, starting with the zone with the least radius for positive optical power of the kinoform element, and beginning with the zone with the greatest radius for negative optical power. Thickness of the removed layer of material is determined by the expression: where Δ is thickness of the removed layer of the material of the lens; n is refraction index of the material of the lens; λ₀ is the fundamental wavelength of the spectral operating range of the lens. Radii of the concentric stepped zones are determined from the expression: W(r_i) = iλ₀, where r_i is radius of the i-th concentric stepped zone; W is phase difference of optical radiation with wavelength λ₀, caused by kinoform profile on the working surface of the lens.

EFFECT: increased diffraction efficiency of diffraction optical lenses with kinoform profile.

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