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DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL SYSTEM INCLUDING THE SAME

  • US 20080043335A1
  • Filed: 10/17/2007
  • Published: 02/21/2008
  • Est. Priority Date: 04/01/2004
  • Status: Active Grant
First Claim
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1. An optical system comprising:

  • a diffractive optical element including a plurality of diffraction gratings laminated and being composed of at least two materials having different dispersions, wherein at least one of the diffraction gratings includes a plurality of grating parts having a curved grating surface and grating tips which connect to define a curved envelope face, wherein the grating surface has a radius of curvature larger than a radius of curvature of the envelope face;

    a refractive optical element, and wherein an absolute value of the radius of curvature of the envelope face is between one-fifteenth of a focal length of the optical system to one-half of the focal length of the optical system, inclusive.

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