NOVELTY - The optical system (10) comprises a collimation optic (14) for receiving a polychromatic divergent light having multiple wavelength components with a dispersion of divergence and for collimating the polychromatic divergent light to provide a collimated beam, a shaping lens having a primary surface with a curve adapted for shaping the collimated beam into a shaped beam with the nearly uniform profile along the first axis, a focusing optic (20) positioned for focusing the shaped beam, and an optical waveguide for propagating a polychromatic light having multiple wavelength components.    USE - The optical system is useful for providing a polychromatic light beam with an uniform profile along a first axis, where the polychromatic light beam is useful for biomedical applications such as bio-detection and precision inspection of microelectronic components and solar cells.    ADVANTAGE - The optical system is capable of easily providing a polychromatic light beam with a uniform intensity profile along the first axis by reducing the deviation, and minimizes a total dispersion of divergence of the polychromatic light beam over the considered range of wavelengths.    DETAILED DESCRIPTION - The optical system (10) comprises a collimation optic (14) for receiving a polychromatic divergent light having multiple wavelength components with a dispersion of divergence and for collimating the polychromatic divergent light to provide a collimated beam, a shaping lens having a primary surface with a curve adapted for shaping the collimated beam into a shaped beam with the nearly uniform profile along the first axis, a focusing optic (20) positioned for focusing the shaped beam, an optical waveguide for propagating a polychromatic light having multiple wavelength components, and a diffractive element positioned for splitting the shaped beam into beams defining an array of uniform profiles. The collimation optic has a first chromatic focal shift. The dispersion of divergence causes a deviation from uniformity of the nearly uniform profile for part of the multiple wavelength components. The focusing optic has a second chromatic focal shift. A combination of the first chromatic focal shift and the second chromatic focal shift compensates for the dispersion of divergence for all of the multiple wavelength components so as to reduce the deviation from uniformity to obtain a profile with a uniform intensity along the first axis. The polychromatic light exits the optical waveguide to provide the divergent light at an output of the optical waveguide. The optical waveguide has a cutoff wavelength defining the dispersion of divergence of the divergent light at the output. The cutoff wavelength of the optical waveguide is selected such that the dispersion of divergence is minimized over the multiple wavelength components and that the optical waveguide is single-mode over the multiple wavelength components. The primary surface is a cylindrical surface defined by a base curve that fits a specified equation in a Cartesian coordinate system (x,y), and is an aspherical surface defined by a revolution of a base curve that fits an specified equation in a Cartesian coordinate system. A magnitude of the absolute value of the product Qc is 0.25-1000 mm-1, where Q is less than -1. The shaping lens comprises a secondary surface, which is a planar surface and/or a cylindrical surface. The focusing optic comprises a beam expander. The optical waveguide is an optical fiber. INDEPENDENT CLAIMS are included for:    (1) a light beam source system; and    (2) a method for providing a polychromatic light beam with a uniform profile along a first axis.    DESCRIPTION OF DRAWING(S) - The diagram shows a block diagram of an optical system for shaping a polychromatic light into a beam with uniform profile.    Optical system (10)    Optic fiber (12)    Collimation optic (14)    Focusing optic (20)    First doublet lens (22)    Second doublet lens (24)    Polychromatic light source. (32)