Apparatus and method for achromatic liquid crystal electro-optic modulation
First Claim
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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.
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Abstract
An achromatic half wave plate includes a first twisted nematic liquid crystal layer, a second twisted nematic liquid crystal layer, and a uniaxial half wave plate between the first twisted nematic liquid crystal layer and the second twisted nematic liquid crystal layer. In one embodiment the first twisted nematic liquid crystal layer and the second twisted nematic liquid crystal layer have an identical twist angle of 135 degrees. The optic axis at the entrance of the first twisted nematic liquid crystal layer is substantially orthogonal to the optic axis at the exit of the second twisted nematic liquid crystal layer.
30 Citations
17 Claims
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1. An achromatic half wave plate, comprising:
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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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification