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We report on a simple and compact experimental scheme to generate high power,ultrafast, higher order vortex array beams. Simply by using a dielectricmicrolens array (MLA) and a plano-convex lens we have generated array beamscarrying the spatial property of the input beam. Considering the MLA as a 2Dsinusoidal phase grating, we have numerically calculated the intensity patternof the array beams in close agreement with the experimental results. UsingGaussian embedded vortex beams of order as high as l= 6, we have generatedvortex array beams with individual vortices of order as high as l= 6. We havealso theoretically derived the parameters controlling the intensity pattern,size and the pitch of the array and verified experimentally. The single-passfrequency-doubling of the vortex array at 1064 nm in a 1.2 mm long BiBO crystalproduced green vortex array of order, l_sh= 12, twice the order of the pumpbeam. Using lenses of different focal lengths, we have observed the vortexarray of all orders to follow the focusing dependent conversion similar to theGaussian beam. The maximum power of the green vortex array is measured to be138 mW at a single-pass efficiency as high as ~3.65%. This generic experimentalscheme can be used to generate array beams of desired spatial intensity profileacross wide wavelength range by simply changing the spatial profile of theinput beam.

Controlled generation of array beams of higher order orbital angular momentum and study of their frequency doubling characteristics