Abstract
We propose and demonstrate a scheme to smooth and shape the on-target
patterns in multimode fiber lasers, which includes expanding-collimating system and
lens array (LA). A smooth pattern with flat-top and sharp-edge profiles can be
obtained with the irradiation nonuniformity decreasing significantly. We analyze the
effects of the parameters such as defocus distance, the tilt angles, the number of
the incident fiber lasers, and the diffraction-weakened LA on the uniformity
irradiation of target by numerical simulations.
© 2014 Chinese Optics Letters
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