Diffraction coherence filter

Details Diffraction coherence filter Diffraction coherence filter

1988-10-18

1990-09-25

Arnold, Bruce Y.

350 361, 350 367, 350172, G03H 102

Patent

active

049588923

ABSTRACT:
A diffraction coherence filter based on Bragg interference principles comprises a plurality of spaced-apart lower-hierarchy optical elements, containing a series of interference structures, which form a higher-hierarchy compound optical structure. The spatial distribution of the lower-hierarchy optical element and the interference structures is governed by mathematical relationships dependent upon the coherence radius and temporal coherence length of incoming radiation. All of the lower-hierarchy elements can be coherently coupled for coherent light and randomly coupled for incoherent light, whereby the filter may differentiate between coherent and incoherent radiation.

REFERENCES:
patent: 4925271 (1990-05-01), Taniura

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