A refracting system consisting of two lenses is designed to
transform an annular Gaussian laser beam into a circular Bessel
beam. The slopes of the input and output surfaces fit well with a
sixth-order polynomial. A smooth variation of the radii of
curvature of the resulting aspheric surfaces is very attractive for
easy machining of the surfaces. The diffraction-free length for the
designed system is 59.4735 m at 633 nm.
© 1998 Optical Society of America
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