Speckle elimination by random spatial phase modulation

Details Speckle elimination by random spatial phase modulation Speckle elimination by random spatial phase modulation

1977-11-17

1979-05-22

Stern, Ronald J.

Optics: image projectors

Plural projection paths with single light source

350 367, 350 377, 350 385, 350162R, 353122, G02B 502, G02B 2700

Patent

active

041556305

ABSTRACT:
A process and apparatus for improving image creation in a coherent light imagery system which involves directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation. More particularly, this invention creates the rocking motion by applying a combination of voltages to three independent piezo-electric crystals upon which the mirror is mounted.

REFERENCES:
patent: 3588217 (1971-06-01), Mathisen
patent: 3782804 (1974-01-01), Kanazawa et al.
patent: 3867009 (1975-02-01), Pawluczyk
patent: 3941456 (1976-03-01), Schilz et al.
patent: 4035068 (1977-07-01), Rawson
Rawson et al., Jour. of the Optical Society of America, vol. 66, No. 2, Feb. 1976, pp. 176-177.
Lowenthal et al., Jour. of the Optical Society of America, vol. 61, No. 7, Jul. 1971, pp. 847-851.

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