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Molding diffractive optical elements

  • US 5,728,324 A
  • Filed: 01/31/1995
  • Issued: 03/17/1998
  • Est. Priority Date: 01/31/1995
  • Status: Expired due to Term
First Claim
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1. A method of fabricating a diffractive optical element comprising the steps of:

  • fabricating a negative of a desired diffraction pattern having multiple discrete levels on a molding surface of a master element using photolithography, including repeating said photolithography step in order to form said multiple discrete levels;

    assembling the master element with the molding surface as a portion of a mold;

    injecting a molding composition into the mold and against the molding surface of the master element to injection mold a diffractive optical element, whereby the optical element has the desired diffraction pattern on its surface; and

    compensating for thermal mismatch between the master element and the mold.

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