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  • a)	When a flashlight beam shines onto a strongly scattering medium such as white paint, the light diffuses in both longitudinal and lateral directions. The transmitted beam becomes wider and the intensity decreases.
    Image by Hasan Yilmaz.
    a) When a flashlight beam shines onto a strongly scattering medium such as white paint, the light diffuses in both longitudinal and lateral directions. The transmitted beam becomes wider and the intensity decreases.
  • b)	By shaping its spatial wavefront, a laser beam can propagate through a strongly scattering medium without lateral diffusion. The backscattering of light is suppressed. The enhanced light transmittance and suppressed lateral beam spreading keep the optical energy density high throughout the scattering medium.
    Image by Hasan Yilmaz.
    b) By shaping its spatial wavefront, a laser beam can propagate through a strongly scattering medium without lateral diffusion. The backscattering of light is suppressed. The enhanced light transmittance and suppressed lateral beam spreading keep the optical energy density high throughout the scattering medium.
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