Continuous wide angle beam steerer using lens translation and ph

Details Continuous wide angle beam steerer using lens translation and ph Continuous wide angle beam steerer using lens translation and ph

1990-03-26

1991-05-14

Dzierzynski, Paul M.

350348, G02B 2608, G02F 113

Patent

active

050150804

ABSTRACT:
A beam steering arrangement includes at least one lens array in which the lenses of the array are spaced at the source spacing, and the array is translated perpendicular to the beams to achieve scanning. Beam-to-beam piston phase differences result in grating lobes, with the result that the steered beam occurs as grating lobes only at discrete angles. An array of phase shifters registered with the lens array is controlled to correct the piston phase difference, thereby providing continuous scanning. In a particular embodiment of the invention the sources of the source array produce collimated beams, and a second lens array is interposed in the beam path. The efficiency of the array is improved by translating both lens arrays rather than one.

REFERENCES:
patent: 4381509 (1983-04-01), Rotman et al.
patent: 4842376 (1989-01-01), Braatz et al.
patent: 4937539 (1990-06-01), Grinberg et al.
"Binary Micro Optics: An Application to Beam Steering", by Goltsos et al., published by Lincoln Laboratories in Connection with SPIE: OE LASE 89, 1052, Jan. 1989.
"Optical Beam Steering Using a Multichannel Lithium Tantalate Crystal", by Meyer, published at pp. 613-616 in the Mar. 1972 issue of Applied Optics, vol. 11, No. 3.
"Continuous Wide Angle Beam Steering Using Translation of Binary Microlens Arrays and a Liquid Crystal Phased Array", by K. M. Flood et al., Corresponds to a Publication made at the Jan. 1990 OE LASE Conference, Los Angeles, Calif.
"Phase Control of Coherent Diode Laser Arrays Using Liquid Crystals", authored by B. Cassarly et al., published in connection with SPIE: OE LASE 89, vol. 1043, paper No. 18, Jan. 1989.

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