A concept of adiabatic shaping of diffuse, spatially incoherent light beams
is presented. The beam shaping is done with a gradient-index rod where the
refractive index profile is changed adiabatically along the rod axis. The
concept is numerically investigated and illustrated with a specific example
of a Gaussian-to-uniform beam transformation. The condition for brightness
conservation and robustness are determined. (C) 2001 Elsevier Science B.V.
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