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Optical spatial frequency filter

  • US 4,575,193 A
  • Filed: 04/06/1984
  • Issued: 03/11/1986
  • Est. Priority Date: 04/06/1984
  • Status: Expired due to Term
First Claim
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1. An optical spatial frequency filter comprising;

  • at least one pair of birefrigent elements for separating a ray of unpolarized white light into three or more spaced apart rays of light and means for changing the polarization state of light between the birefrigent elements, wherein the means for changing the polarization state of light changes the polarization state of light of a first color by a first amount, and changes the polarization state of light of a second color by a second amount different from the first amount such that light of said first color is split into a first subset of one or more of said rays, separated by a first distance in a given direction, and light of said second color is split into a second subset of two or more of said rays, separated by a second distance larger than said first distance in said given direction, whereby the spatial frequency response of the spatial frequency filter is color dependent and higher for said first color than for said second color.

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