Optical: systems and elements – Light interference – Produced by coating or lamina
Patent
1993-02-17
1995-03-21
Ben, Loha
Optical: systems and elements
Light interference
Produced by coating or lamina
359359, 359583, 359584, G02B 110, G02B 520
Patent
active
054001790
ABSTRACT:
An optical multilayer thin film and a beam splitter having an optical multilayer thin film are disclosed. The optical multilayer thin film is formed by laminating six layers in sequence. The laminated six layers comprise: a first layer, a third layer and a fifth layer each having a refractive index between 1.63 and 1.64; a second layer and a sixth layer each having a refractive index between 1.37 and 1.38, a fourth layer having a refractive index between 1.9 and 2.3; in which light is allowed to be incident upon the first layer of the optical multilayer thin film at the angle of incidence equal to or greater than 40.degree.. In the beam splitter, the reflectances of S and P polarized components of reflected light are substantially equal to each other over a wide wavelength range and substantially no phase difference exists between the S and P polarized components. Further a beam splitter having a multilayer polarizing light separating film formed between an incoming side prism and an outgoing side prism is also disclosed, which is extremely high in the reflectance of the P polarized component of reflected light, in comparison with that of the S polarized component of the same reflected light.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Ben Loha
Jr. John Juba
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