High reflectivity coated mirror producing 90 degree phase shift

Details High reflectivity coated mirror producing 90 degree phase shift High reflectivity coated mirror producing 90 degree phase shift

1979-09-14

1982-01-26

Lee, John D.

350164, 350288, 350394, G02B 528

Patent

active

043125700

ABSTRACT:
A high reflectivity mirror produces a substantially 90.degree. phase shift between p and s plane polarization components of the reflected light by applying a plurality of super-imposed transparent layers on the reflective surface of a substrate. Adjacent layers are made of materials of substantially different indices of refraction. The thickness of substantially all of the layers is less than a quarter wavelength at the center frequency of the incident light and the thickness of the layers differ from each other in a predetermined manner to control and produce exactly 90.degree. phase shift between the s and p polarization components while providing maximum reflectivity over a wide frequency band.

REFERENCES:
patent: 2519722 (1950-08-01), Turner
patent: 3851973 (1974-12-01), Macek
patent: 4147409 (1979-04-01), Apfel
patent: 4189205 (1980-02-01), Vandehei
Kard, "On the Influence of Thin Films on Total Reflection ", Optics & Spectroscopy, vol. 6, No. 4, Apr. 1959, pp. 339-341.
Baumeister, "Methods of Altering the Characteristics of a Multilayer Stack", J.O.S.A., vol. 52, No. 10, Oct. 1962, pp. 1149-1152.
Mauer, "Phase Compensation of Total Internal Reflection", J.O.S.A., vol. 56, No. 9, Sep. 1966, pp. 1219-1221.
Costich, "Reduction of Polarization Effects in Interference Coatings", Applied Optics, vol. 9, No. 4, Apr. 1970, pp. 866-870.

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