Optical: systems and elements – Polarization without modulation – Depolarization
Patent
1993-03-03
1997-07-01
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
Depolarization
359495, 359497, 359301, 359304, G02B 530, G02B 2608, G02B 2728
Patent
active
056444281
ABSTRACT:
An optical beam splitter separates an input beam into two exit beams which angularly diverge from each other by a continuously variable amount. The degree of angular divergence is controlled by rotating a compound cylinder composed of a half-cylinder of birefringent material and a half-cylinder of glass about their common cylindrical axis. The cylinder is placed between a pair of plano-concave sections, which match the curvature and materials of the cylinder. The ordinary refractive index of the birefringent half-cylinder section is matched to that of the isotropic glass half-cylinder, which limits the changes in exit beam angular divergence to only one of the beams. A phase compensation block preceding the birefringent plano-concave section and the compound cylinder prevents the accumulation of optical phase between the two exit beams. The interfaces between the fixed birefringent plano-concave section and the birefringent half-cylinder as well as the glass half-cylinder and the fixed glass plano-concave sections are immersed in an index matching oil to minimize optical wavefront distortion at these interfaces.
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International Business Machines - Corporation
Morris Daniel P.
Shafer Ricky D.
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