| 摘要 |
A beam steering arrangement for a plurality of beams of electromagnetic radiation from a like plurality of sources arrayed with a preselected source-to-source spacing includes a first lens array. The period of the lenses corresponds to that of the sources. The lenses of the first array may be converging or diverging lenses, but when illuminated by the sources, each produces a beam of light including at least a diverging portion. A second lens array is cascaded with the first lens array, with the lenses of the second array illuminated by the diverging beam portions. The second lens array collimates the diverging beam portions. The second lens array is translated in a direction approximately transverse to the undeflected beam direction in order to scan or deflect the collimated beams. This may result in overfilling of the input apertures of the lenses of the output lens array, with consequent reduction in the amplitude of the main beam, and with generation of beams of lower intensity in other directions. The first lens array is translated in a fashion which scans the diverging beam portions to prevent aperture overfilling. In particular embodiments of the invention, the lenses of the output lens array are converging lenses, and the input lens array may include either converging or diverging lenses. In another embodiment of the invention, the pair of translatable lens arrays is cascaded with an array of phase shifters for providing piston phase correction by which a continuous range of scan directions may be achieved.
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