Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Reexamination Certificate
2008-05-27
2008-05-27
Allen, Stephone B. (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
C359S490020, C359S638000, C353S020000
Reexamination Certificate
active
07379242
ABSTRACT:
The present invention provides a polarization beam splitter including a multilayer film formed by laminating a first layer having a refractive index in a first range, a second layer having a refractive index in a second range which does not overlap the first range, and a third layer having a refractive index in a third range which does not overlap the first or second range in the order of the first layer, the second layer, the first layer, and the third layer in succession, wherein the transmittance of s-polarized light is 60% or more higher than the transmittance of p-polarized light in a first wavelength region, the transmittance of p-polarized light is equal to or higher than 70% in a second wavelength region different from the first wavelength region, and each of the first wavelength region and the second wavelength region has a bandwidth equal to or larger than 30 nm.
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Li Li and J. A. Dobrowolski, “High-performance thin-film polarizing beam splitter operating at angles greater than the critical angle”, Applied Optical, vol. 39, pp. 2754-2771, Jun. 1, 2000.
Allen Stephone B.
Canon Kabushiki Kaisha
Fineman Lee
Morgan & Finnegan , LLP
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