Polarizing beam splitter

Details Polarizing beam splitter Polarizing beam splitter

2007-10-30

2007-10-30

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S494010

Reexamination Certificate

active

10902321

ABSTRACT:
A polarizing beam splitter having a film made of a high-refractivity material and a film made of a low-refractivity material alternately stacked on a substrate. When an incidence angle with respect to a film surface in a particular wavelength is set as θ (°), the following conditional expressions are satisfied in the range of 40≦θ≦50(°):0.99≦Rs(45)/Rs(θ)≦1.04, 0.96≦Tp(45)/Tp(θ)≦1.05, where Rs(θ): reflectivity of polarized light s at a θ incidence; Tp(θ) transmissivity of polarized light p at a θ incidence angle; Rs(45): reflectivity of polarized light s at a 45° incidence angle; and, Tp(45) transmissivity of polarized light p at a 45° incidence angle. The transmissivity of the polarized light p does not decrease and the reflectivity of the polarized light s is nearly 100% with respect to even a broad angle region.

REFERENCES:
patent: 5973835 (1999-10-01), Tsou et al.
patent: 6014255 (2000-01-01), Van Der Wal et al.
patent: 6096375 (2000-08-01), Ouderkirk et al.
patent: 08-146218 (1996-06-01), None
patent: 09-184916 (1997-07-01), None

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