Transmissive phase retarder

Details Transmissive phase retarder Transmissive phase retarder

1985-02-20

1985-08-20

Punter, William H.

350164, G02B 530, G02B 110

Patent

active

045360634

ABSTRACT:
The present invention is a transmissive phase retarder in which reflection of an incident beam of light is substantially reduced and in which the incident light experiences a phase retardation between the s- and p-plane polarization components of the transmitted light. The transmissive phase retarder includes a transmissive substrate, such as glass, and a plurality of superimposed thin film transparent layers on the transmissive substrate. The adjacent layers of the superimposed thin film layers are made of materials of substantially different indices of refraction, n.sub.i. The optical thicknesses, f.sub.i, of the layers are prescribed so that they satisfy the transmission and retardation requirements in order to produce both maximum transmission and a specified phase shift, .PHI..sub.i, in the s- and p-plane polarization components of the transmitted light for a broadband range of wavelengths at a specified angle of incidence, .theta..sub.os, by minimizing a merit function by adjusting the optical thickness, f.sub.i, of each layer wherein the merit function, ##EQU1## where .PHI.(f.sub.i), and T.sub.s (f.sub.i) and T.sub.p (f.sub.i) are standard functions for determining the phase retardation, the transmission of the s-plane polarization component and the transmission of the p-plane polarization component of transmitted light, respectively, for a particular set of wavelengths, .lambda..sub.i.

REFERENCES:
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patent: 3858965 (1975-01-01), Sumita
patent: 4312570 (1982-01-01), Southwell
Southwell, W. H., "Multilayer Coating Design Achieving a Broad Band 90.degree. Phase Shift", App. Optics, 8-1980, pp. 2688-2692.
Southwell, W. H., "Multilayer High Reflective Coating Designs Achieving Broadband 90.degree. Phase Change", Proc. Soc. Photo-Opt. Instrum. Eng. (U.S.A.), SPIE, vol. 190, LASL Optics Conf. 1979, pp. 81-88.
Krylova, T. N., "The Reflection of Light from a Coated Surface at Various Angles of Incidence", Soviet Jr. Opt. Tech., 11, 12-1968, pp. 695-698.
Dobrowolski, J. A., "Completely Automatic Synthesis of Optical Thin Film Systems", App. Optics, 8-1965, pp. 937-946.
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