Holographic imaging through scattering media

Details Holographic imaging through scattering media Holographic imaging through scattering media

1992-03-25

1994-03-29

Sugarman, Scott J.

Optical: systems and elements

Holographic system or element

For synthetically generating a hologram

359 1, 359 28, 359 30, 359 35, 359900, 382 6, G03H 102, G03H 104, G03H 108

Patent

active

052990354

ABSTRACT:
An image of an object embedded in a diffusing medium is formed by propagating a coherent or equivalent light pulse through the diffusing medium and applying a reference pulse so as to gate precisely the first emerging light transmitted through the diffusing medium. An ultra-short pulse, having a duration on the order of 150 fs, insures that only the first emerging light is used to form a hologram. Instability in the diffusing medium, which may be inherent therein, as is the case with living tissue, or artificially induced therein, such as by vibrating the specimen, ensures that a subsequent hologram has a different background noise and speckle pattern. Integration of such holograms causes the background noise to average out, but time-invariant features, such as the object being imaged, become increasingly more visible as more holograms are integrated.

REFERENCES:
patent: 3614426 (1971-10-01), Donzelle
patent: 3639029 (1972-02-01), Haines
patent: 4432597 (1984-02-01), Bjorklund et al.
patent: 5126862 (1992-06-01), Hong et al.

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