Unpolarized light beam splitter

Details Unpolarized light beam splitter Unpolarized light beam splitter

1996-10-31

1998-02-10

Nelms, David C.

Optical: systems and elements

Light interference

Produced by coating or lamina

359634, G02B 110

Patent

active

057175233

ABSTRACT:
Four kinds of dielectrics in the form of a mixture of ZrO.sub.2 and TiO.sub.2 having a refractive index of 2.07, MgF.sub.2 having a refractive index of 1.37, Al.sub.2 O.sub.3 having a refractive index of 1.61, and TiO.sub.2 having a refractive index of 2.27 are laminated on a transparent glass substrate in twenty layers. Two kinds of unpolarized light beam splitters having ratios of the reflected light to the transmitted light of 7:3 and 8:2, respectively, are thereby obtained. Both kinds of unpolarized light beam splitters have the twentieth layer, that is the outermost layer, formed with MgF.sub.2. The difference between the reflectance of the polarizing P component and the reflectance of the polarizing S component of the reflected light is set to be below 10%.

REFERENCES:
patent: 4373782 (1983-02-01), Thelen
patent: 5296961 (1994-03-01), Trost et al.
patent: 5400179 (1995-03-01), Ito
patent: 5453859 (1995-09-01), Sannohe et al.
patent: 5502595 (1996-03-01), Kuo et al.
patent: 5625492 (1997-04-01), Gunkel et al.

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