Apparatus for producing a light beam having a uniform phase fron

Details Apparatus for producing a light beam having a uniform phase fron Apparatus for producing a light beam having a uniform phase fron

1977-03-14

1978-08-08

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250552, 350 9628, 350 9615, G01C 308, G02B 514

Patent

active

041053320

ABSTRACT:
An apparatus including a frusto-conically shaped tube for transmitting light with internal reflection surfaces which diverge in the direction from input to output. Incident light from an LED or other substantially phase coherent source is mixed by internal reflection of rays incident at greater than a predetermined angle to minimize the non-uniform phase front and concentrate the beam to permit greater transmitted power. The apparatus finds particular utility in distance measuring instruments in which the output of the tube is directed to an object and the phase of the reflected light compared with the phase of the transmitted light to determine the distance.

REFERENCES:
patent: 3600568 (1971-08-01), Weyrauch
patent: 3604802 (1971-09-01), Ohmori et al.
patent: 3619058 (1971-11-01), Hewlett et al.
patent: 3691390 (1972-09-01), Chow et al.
patent: 3759616 (1973-09-01), Hildebrand
patent: 3832028 (1974-08-01), Kapron
patent: 3902803 (1975-09-01), Lego, Jr.
Chen et al; Applied Optics, vol. 2, No. 3, Mar. 1963, pp. 265-271.

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