Retarder stack for preconditioning light for a modulator having modulation and isotropic states of polarization
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United States of America Patent
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Jul 27, 1999
Issued Date -
N/A
app pub date -
May 9, 1997
filing date -
May 23, 1995
priority date (Note) -
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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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