Paper Title
Design of a Two-Element Refractive System for High-Power Diffraction-Free Laser Beam Transformation

Abstract
A design of two-lens (instead of one-lens) refractive system is proposed to transform high-power laser beams irradiance profiles. Specifically, two plano-aspheric lenses are designed to transform high-power annular-uniform beam to a nondiffracting Bessel beam. It will be demonstrated that the two-element design outperforms the one-element design (previously reported) regarding the system length. Index Terms - Beam shaping, refractive system, two-lens design.