Compositive wave plate
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United States of America Patent
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Issued Date -
Aug 9, 2007
app pub date -
Apr 15, 2004
filing date -
Apr 16, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention is intended to solve the problem of a phase shift by the incidence angle dependence of a composite wave plate which is caused when divergent light is incident directly thereon because of occurrence of a phase shift in addition to a desired phase difference of the composite wave plate. The composite wave plate is composed of two laminated wave plates, and respective parameters are set such that: letting .theta.1 represent the azimuth angle of the optical axis of the first wave plate with respect to the plane of polarization of incident light thereon in the Poincare sphere representation, .theta.2 represent the azimuth angle of the optical axis of the second wave plate with respect to the plane of polarization of incident light thereon in the Poincare sphere representation, .GAMMA.1 represent a phase rotation about the axis of rotation R1 of the first wave plate in the Poincare sphere representation, and .GAMMA.2 represent a phase rotation about the axis of rotation R2 of the second wave plate in the Poincare sphere representation,.theta.2-.theta.1.noteq..pi./2;and that a phase difference .GAMMA.T of the composite wave plate satisfies.GAMMA.T=(2.times..theta.1-.pi./2)cos .GAMMA.1+(2.times..theta.2-.pi.)cos .GAMMA.2.
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