The incident laser beams randomly diffuse in turbid medium and form a volume complex speckle at the output field. In this paper, we demonstrate focusing of polychromatic light with different spectrum bandwidth through turbid medium by using feedback optimization algorithm with the help of spatial light modulator. Polychromatic light with different spectrum bandwidth is generated by a series of bandpass filters and super-continuum laser. Speckle patterns produced by polychromatic light with different spectral bandwidths are compared. And the influence of spectrum bandwidth on light intensity enhancement is investigated. Experimental results are found to be in good agreement with theoretical for light refocusing.
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