Surface roughness dependence of the first-order probability density function for integrated speckle |
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Authors: | Chulwoo Jung Dongwoo Kim and S Y Kim |
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Institution: | Department of Physics, Korea Advanced Institute of Science and Technology, Taejon, South Korea |
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Abstract: | The surface roughness dependence of the first-order probability density function (PDF) of an integrated speckle pattern, produced in the condition of circular detection aperture and gaussian scattering spot, was theoretically investigated. The mutual intensity JA(x1, y1; x2, y2) containing two roughness parameters, dispersion of surface height ø2 lateral correlation length xc, was calculated. The exact first-order probability density function was analytically derived and numerically calculated by means of the Karhunen-Loeve expansion and fast Fourier transform (FFT). As a diffuse object became smooth, the first order probability density function was changed from negative exponential to sharp peak gaussian centered around mean intensity. |
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