Method for making a smooth, uniform image of a laser diode array

Details Method for making a smooth, uniform image of a laser diode array Method for making a smooth, uniform image of a laser diode array

1988-10-03

1989-11-21

Shaw, Clifford C.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

350401, 350402, 369121, G01D 1514, G02B 530, G11B 700

Patent

active

048825948

ABSTRACT:
Phase array apparatus for use with a lens system to provide a substantially smooth, uniform image of a laser array comprised of a multiplicity of lasers wherein the phase of the radiation emitted by the lasers alternates by an amount which is substantially equal to 180.degree.. The phase array includes: (1) phase means, disposed substantially at a far-field image of the laser array formed by the lens system, which far-field image comprises two prominent lobes, for changing the phase of the radiation in the two prominent lobes by 90.degree. with respect to the phase of the remaining radiation in the far-field image in order to convert the near-field image of the laser array into a finite-length sine pattern and (2) means, such as a wedge prism or a split lens, disposed preferably near a far-field image but not at a near-field image, for angularly shifting one half of the phase shifted far-field image with respect to the other to form a pair of near-field images which are spatially shifted with respect to each other by one-half cycle of the sine wave, whereby a substantially smooth, uniform image of the laser array is formed.

REFERENCES:
patent: 4198123 (1980-04-01), Kremen
patent: 4822151 (1989-04-01), Tatsuno
Diffraction Theory of Microscopic Vision, A. B. Porter, Phil. Mag. S. 6., vol. 11, No. 61, Jan. 1906.

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