Polarizing filter and optical device using the same

Details Polarizing filter and optical device using the same Polarizing filter and optical device using the same

2007-01-16

2007-01-16

Shafer, Ricky D. (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S488010, C359S485050, C359S583000, C359S586000, C359S588000

Reexamination Certificate

active

10946316

ABSTRACT:
A polarizing filter has a laminate structure: wherein one to four layers of first dielectric thin films1and one to four layers of second dielectric thin films2are alternately laminated on a transparent flat substrate10to form the laminate structure, the layers of second dielectric thin films2having a refractive index lower than that of the first dielectric thin films1with respect to the wavelength of incident light; wherein one layer of the third dielectric thin film3having a refractive index intermediate between the refractive indices of the first and second dielectric thin films with respect to the wavelength of incident light is laminated on a surface of the laminate structure.In an optical device using the polarizing filter, the angle of incidence is set to be in a range of from 20 to 70 degrees.

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