Polarizing beam splitter and polarizer using the same

Details Polarizing beam splitter and polarizer using the same Polarizing beam splitter and polarizer using the same

2006-03-14

2006-03-14

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Polarization without modulation

Polarizarion by dichroism

C359S490020, C359S490020, C359S583000

Reexamination Certificate

active

07012747

ABSTRACT:
There are provided an inexpensive polarizing beam splitter having a polarized light beam separating function of a wide range with a simple film construction and a reduced number of laminated film layers, and a polarizer provided with the polarizing beam splitter to arrange natural light into a specific polarized state.A polarizing beam splitter1is constructed including a polarized light beam separation film2:in which a first polarized light beam L1of a light L0incident at a predetermined angle is transmitted and a second polarized light beam L2of the incident light L0is reflected in a direction different from the above transmitted direction, having any structure of (H2L)m, (H2L)mH, and 2L(H2L)m(where m is an integer 3 or more) , each of which is a repeated structure of a basic structure film H2L that, when λ0represents a reference wavelength of 550 nm of the incident light, is constructed of a high refractive-index layer H and low refractive-index layer L each of which has an optical film thickness approximately equal to λ0/4; and transparent substrates3A,3B disposed on the light-entering surface2A side and on the light-outgoing surface2B side of the above film2, respectively. Also, a polarizer is constructed being provided with the above polarizing beam splitter1and is formed by alternately laminating the polarized light beam separation film and transparent substrate to be obliquely cut out.

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