Retarder stack for preconditioning light for a modulator having modulation and isotropic states of polarization
First Claim
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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Accused Products
Abstract
A retarder stack for preconditioning at least partially polarized light for input to a modulator includes a first retarder and the second retarder. The first retarder has a first retardance and a first orientation with respect to the partially polarized light and the second retarder has a second retardance and a second orientation with respect to the partially polarized light. The first retarder and second retarder are oriented with respect to each other and the first retardance and the second retardance are selected such that the light output from the second retarder includes a first portion of light and a second portion of light which, if input to a modulator, would be modulated differently. Hence, the retarder stack can be used to precondition light for input to a modulator such as an electro-optic, magneto-optic or other type of modulator.
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Citations
65 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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17. A retarder stack for preconditioning at least partially polarized light for input to a modulator which modulates one polarization more than another, comprising
a polarizer for receiving input light and outputting the at least partially polarized light; -
a first retarder having a first retardance and a first orientation with respect to said at least partially polarized light, for receiving said as 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 lights for receiving said initially transformed light and outputting light comprising a first portion of output light having a predetermined first spectrum and a second portion of output light having a predetermined seconded spectrum, wherein said polarizer, said first retarder, and said second retarder are selected such that said first portion of output light has a polarization that would not be modulated by the modulator and said second portion of output light has a polarization that would be modulated by the modulator. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A retarder stack for selectively outputting light for input to a modulator which modulates one polarization more than another, comprising:
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a first retarder having a first retardance and a first orientation with respect to an at least partially polarized light, for receiving said at least partially polarized light and outputting initially transformed light; 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 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 polarizer, said first retarder and said second retarder, are selected such that a polarization of said first portion of output light and a polarization of said second portion of output light are orthogonal and such that the polarization of said first portion of output light would be modulated by the modulator more than the polarization of said second portion of output light; and an analyzer for receiving said output light and outputting one of said first portion of output light and said second portion of output light. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification