Coherent aperture filling of an array of lasers

Details Coherent aperture filling of an array of lasers Coherent aperture filling of an array of lasers

1986-10-17

1990-06-12

Moskowitz, Nelson

Amplifiers

Parametric amplifiers

Semiconductor type

35016224, 3501622, H01S 308, H04B 900

Patent

active

049336495

ABSTRACT:
A technique for coherent aperture filling by amplitude phase exchange is described which suppresses the far field side lobes of an array of lasers. The power contained in these side lobes is transferred to the central lobe so that it contains greater than 90% of the total array power. This is achieved by a field transformation which generates from the uniform phase and varying amplitude distribution of the input array a varying phase modulation with nearly uniform, i.e., aperture filled, amplitude distribution in the output beam. Far-field grating lobes from the nonuniformity in phase are then suppressed by an additional phase correcting element matched to compensate the phase modulation. In a preferred embodiment, the field transformation element, including a single step binary phase shifter flanked by a pair of lenses in an a focal imaging configuration, is followed by a binary phase grating for phase compensation.

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patent: 4649351 (1987-03-01), Veldkemp et al.
patent: 4656562 (1987-04-01), Sugino
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Veldkamp et al.; "High Efficieny Binary Lenses"; 4/15/85; Opt. Comm., vol. 53, #6, pp. 353-359.
Horner et al.; "Pattern Recognition . . . Filters"; Appl. Opt., vol. 24, #5, 3/1/85.
Veldkamp, W. B.; "Laser Beam Profile . . . Gratings;" Appl. Opt., vol. 21, #17, 9/1/82, pp. 3209-3212.
Veldkamp, W. B.; "Laser Beam Profile . . . Gratings"; Opt. Comm. ; vol. 38, #5,6, pp. 381-386, 9/1/81.
Swanson et al., "Binary Lenses . . . Micrometer"; Opt. Eng., vol. 24, #5, pp. 791-95, 96/10/85; abst. only.
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