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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 10,
  • pp. 101402-
  • (2014)

Theoretical analysis of lens array for uniform irradiation on target in multimode fiber lasers

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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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