Variable transmission beamsplitter

Details Variable transmission beamsplitter Variable transmission beamsplitter

1998-10-26

1999-08-31

Spyrou, Cassandra

Optical: systems and elements

Prism

359833, G02B 504

Patent

active

059461489

ABSTRACT:
The present invention consists of two right angle prisms, one of which is coated with a wedged layer of low index of refraction transparent material such as magnesium fluoride. The coating varies in thickness, linearly, for example, from about 50 to 700 nanometers, for example. The prisms are cemented together forming a rectangular cube beamsplitter. The beamsplitter is then mounted onto a stage so that the plane of the cemented surfaces is parallel to the axis of translation. As one translates the cube along its axis, the ratio of reflectance to transmittance varies according to the thickness or other factors.

REFERENCES:
patent: 2809570 (1957-10-01), Dearing et al.
patent: 2815695 (1957-12-01), Scharf et al.
patent: 2960015 (1960-11-01), Rodine
patent: 4796997 (1989-01-01), Svetkoff et al.
patent: 4931636 (1990-06-01), Huggins
patent: 5272518 (1993-12-01), Vincent

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