Optical polarimeter having four channels

Details Optical polarimeter having four channels Optical polarimeter having four channels

1991-06-03

1992-01-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356367, G02F 101, G01J 400

Patent

active

050813480

ABSTRACT:
A method of and an apparatus for rapidly determining the polarization state of an incoming beam of light, such as from a fibre optic. The incoming beam is passed through a beam expander and then four separate portions of that beam are passed simultaneously through four Stokes filters respectively, arranged in a common plane. The four filtered beam portions are directed by respective lenses on to four detectors providing electrical signals indicative of the intensity of the respective filtered beams. From these four signals, the Stokes parameters may be deduced. The method allows very rapid assessments of the polarization state of an incoming beam to be achieved, and a bandwidth of several tens of KHz is attainable.

REFERENCES:
patent: 3556662 (1971-01-01), Levenstein et al.
patent: 4158506 (1979-06-01), Collett
patent: 4171916 (1979-10-01), Simms et al.
patent: 4392723 (1983-07-01), Gehmann
patent: 4681450 (1987-07-01), Azzam
patent: 4698497 (1987-10-01), Miller et al.
patent: 4777358 (1988-10-01), Nelson
patent: 4904085 (1990-02-01), Spillman, Jr. et al.
Detken, "Polarimetric Methods in Astrophysics", Jena Review, 6/70, pp. 330-334.
Hannemann, "A Polarimeter to Measure the Complete State of Polarization of Scattered Solar Radiation", Contrib. Atmos. Phys. (GB), vol. 48, No. 1, 1975, pp. 76-84.

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