Variable phase stop for use in interferometers

Details Variable phase stop for use in interferometers Variable phase stop for use in interferometers

1988-08-22

1989-05-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250550, 350509, G01J 120

Patent

active

048333140

ABSTRACT:
An electro-optical device (10) is used to alter characteristics of a light beam passing through it. In a particularly preferred embodiment, the device (10) is used as a phase stop having a dynamically variable aperture whose size is defined by the selected application of an electrical potential across one or more concentric, transparent ring-like electrodes (13, 14, 16 and 18). The electro-optical device (10) finds particular utility in a common-path interferometer (40) where fringe visibility is optimized by using suitable servo-electronics (56) to select an appropriate aperture size for the phase stop (10).

REFERENCES:
patent: 2766655 (1956-10-01), Pinkowski
patent: 3402001 (1968-09-01), Fleisher
patent: 3634695 (1972-01-01), Barringer
patent: 3646608 (1972-02-01), Rowland
patent: 4309602 (1982-01-01), Gonsalves et al.
patent: 4313663 (1982-02-01), Stemme et al.
patent: 4333720 (1982-06-01), Suzuki et al.
patent: 4370024 (1983-01-01), Task et al.
IBM Technical Disclosure Bulletin, vol. 27, No. 10B, Mar. 1985, "Thin Film Camera Iris Using Liquid Crystalline Material", pp.6166-6167.
O. Y. Kown, "Multichannel Phase-Shifted Interferometer", Optics Letters, vol. 9, No. 2, Feb. 1984, pp. 59-61.

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