Variable light attenuator

Details Variable light attenuator Variable light attenuator

1985-08-19

1987-05-12

Punter, William H.

350407, 350622, 350623, G02F 119, G02B 1700

Patent

active

046644849

ABSTRACT:
A variable light attenuator comprises a pair of spaced optical elements, each having a reflective surface and at least one being adapted to variably polarize a light beam as a function of its angle of incidence. Means are provided for rotatably supporting the optical elements so that the beam, upon being reflected from both elements, is always parallel to the input beam, regardless of its angle of incidence. Preferably, a second pair of reflective elements, similarly structured, arranged and supported, cooperates with the first pair of reflective elements to produce a variably attenuated output beam which is colinear with the input beam.

REFERENCES:
patent: 2651971 (1953-09-01), Rosch
patent: 4398806 (1983-08-01), Bennett et al.
Dubrovskii et al, "Device for Continuous Attenuation of a Light Beam", Instrum. & Exp. Tech. (USA), 9-1970.
Watanabe, N., "A Useful Device for an Axis Variation of the Angle of Incidence", Jr. of Physics E, 7-1975, pp. 546.
Golovachev et al, "Disrupted-Total-Internal-Reflection Polarizing Attachment", Instrum. & Exp. Tech. (USA), 2-1977, pp. 1159-1161.

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