Fringe visibility enhancement arrangement and method

Details Fringe visibility enhancement arrangement and method Fringe visibility enhancement arrangement and method

1988-12-27

1990-02-27

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 902

Patent

active

049040820

ABSTRACT:
An arrangement for smoothing a coherent laser beam of a limited yet substantial coherence length due to the presence of several discrete optical frequencies therein is operative for subdividing the coherent laser beam into a plurality of partial beams of substantially the same intensity. Each of the partial beams is then conducted in a different path, the length of at least one of which differs from that of another path by a distance amounting to a fraction of the coherence length. At least some of the partial beams are subsequently combined into a coherent output beam in which the partial beam issued from the one path is shifted by the distance relative to that issued from the other path.

REFERENCES:
patent: 4699513 (1987-10-01), Brooks et al.

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