Apparatus for producing optical interference pattern with contin

Details Apparatus for producing optical interference pattern with contin Apparatus for producing optical interference pattern with contin

1975-04-22

1977-03-01

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351 14, 356113, G02B 2700, A61B 310

Patent

active

040099407

ABSTRACT:
First and second triangular prisms are bonded together at their bases with a semi-transparent reflecting material therebetween. A light beam from a laser is incident on the upstream face of the first prism and refracted thereby so as to be incident on the semi-transparent reflecting material at a predetermined angle to the longitudinal axis thereof. One component of the beam is reflected from the semi-transparent material and refracted by the first prism so as to emerge therefrom parallel to the axis of the semi-transparent material. Another component of the beam passes through the semi-transparent material and is refracted by the second prism so as to emerge therefrom parallel to the axis of the semi-transparent material. A lens converges the two beam components to produce an interference pattern. Linear movement of the laser or a plane reflector disposed between the laser and the first prism varies the point of incidence of the beam on the upstream face of the first prism and thereby the spacing between the first and second beam components emerging from the first and second prisms and the fringe spacing of the interference pattern.

REFERENCES:
patent: 1383543 (1921-07-01), Ives
patent: 1722356 (1929-07-01), Romer
patent: 1862950 (1932-06-01), Ball
patent: 3507564 (1970-04-01), Franks
patent: 3586416 (1971-06-01), DeBitetto
patent: 3628866 (1971-12-01), Mueller
patent: 3695749 (1972-10-01), Stapleton
patent: 3832063 (1974-08-01), Matsumoto et al.
Jenkins & White, Fund of Optics, 3rd Ed., 1957, p. 259.

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