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Diffractive optical element and photographic optical system having the same

  • US 6,507,437 B1
  • Filed: 12/21/1999
  • Issued: 01/14/2003
  • Est. Priority Date: 12/24/1998
  • Status: Expired due to Fees
First Claim
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1. A photographic optical system comprising a diffractive optical element having a grating structure in which a plurality of diffraction gratings made from at least two kinds of materials different in dispersion from each other are laminated, and a maximum optical path length difference in the grating structure being m times the design wavelength for each of the design wavelengths, where m is a design order of diffraction, said diffractive optical element satisfies the following conditions for the design wavelengths λ

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