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Retarder stack for preconditioning light for a modulator having modulation and isotropic states of polarization

  • US 5,929,946 A
  • Filed: 05/09/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 05/23/1995
  • Status: Expired due to Term
First Claim
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1. A retarder stack for preconditioning at least partially polarized light for input to a modulator which modulates one polarization more than another, comprising:

  • a first retarder having a first retardance and a first orientation with respect to said at least partially polarized light for receiving said at least partially polarized light and outputting initially transformed light; and

    a second retarder having a second retardance and a second, orientation with respect to said at least partially polarized light for receiving said initially transformed light and outputting output light comprising a first portion of output light having a predetermined first spectrum and a second portion of output light having a predetermined second spectrum, wherein said first and second orientations and said first and second retardances are selected such that said first portion of output light has a polarization that would be modulated by the modulator more than a polarization of said second portion of output light.

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