US 12,253,695 B2
Diffractive optical element, method for designing an efficiency-achromatized diffractive structure, and method for producing an efficiency-achromatized diffractive element
Daniel Werdehausen, Jena (DE); and Manuel Decker, Jena (DE)
Assigned to Carl Zeiss AG, Oberkochen (DE)
Appl. No. 17/603,714
Filed by Carl Zeiss AG, Oberkochen (DE)
PCT Filed Apr. 9, 2020, PCT No. PCT/EP2020/060216
§ 371(c)(1), (2) Date Oct. 14, 2021,
PCT Pub. No. WO2020/212257, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 102019109944.7 (DE), filed on Apr. 15, 2019.
Prior Publication US 2022/0196896 A1, Jun. 23, 2022
Int. Cl. G02B 5/18 (2006.01); B29C 64/386 (2017.01); B29D 11/00 (2006.01); B33Y 50/00 (2015.01); B33Y 80/00 (2015.01); G02B 27/00 (2006.01)
CPC G02B 5/1847 (2013.01) [B29C 64/386 (2017.08); B29D 11/00769 (2013.01); B29D 11/00951 (2013.01); B33Y 50/00 (2014.12); B33Y 80/00 (2014.12); G02B 27/0012 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A diffractive optical element, comprising:
a material with a spatial variation in the refractive index,
wherein a sequence of laterally adjoining sections is formed by the spatial variation in the refractive index, wherein a refractive index within each of the sections varies laterally, and which sequence forms a diffractive structure, and
wherein the diffractive structure comprises one single layer and has a polychromatic integral diffraction efficiency of at least 0.95 over a spectral range extending over at least 300 nm,
wherein a value of the diffraction efficiency of at least 0.95 averaged over the spectral range of at least 300 nm is provided by the diffractive structure with a combination of at least an optimized maximum refractive index nmax and an optimized minimum refractive index nmin and at least an optimized high Abbe number vmax and an optimized low Abbe number vmin within each section of the sequence of laterally adjoining sections.