×

Apparatus and method for achromatic liquid crystal electro-optic modulation

  • US 6,765,635 B1
  • Filed: 12/28/2001
  • Issued: 07/20/2004
  • Est. Priority Date: 12/28/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. An achromatic half wave plate, comprising:

  • a first twisted nematic liquid crystal layer;

    a second twisted nematic liquid crystal layer; and

    a uniaxial half wave plate between said first twisted nematic liquid crystal layer and said second twisted nematic liquid crystal layer, wherein the optic axis at the entrance of said uniaxial half wave plate makes an angle of 45 degrees to the polarization of said incident beam, wherein said incident beam is linearly polarized, and an angle of 90 degrees to the optic axis at the exit of said first twisted nematic liquid crystal layer, wherein the optic axis at the entrance of said second twisted nematic liquid crystal layer is parallel to the optic axis at the exit of said first twisted nematic liquid crystal layer and makes an angle of 90 degrees to the optic axis of said uniaxial half wave plate.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×