Fig. 1. (a) Random surface with α of 1.0, ξ of 0.5 µm, and ω of 0.2 µm; (b) random surface with α of 1.0, ξ of 0.5 µm, and ω of 0.3 µm.

Fig. 2. Shadowing effect of the surface.

Fig. 3. Use slope to judge the shadowing effect.

Fig. 4. Generation process of DFRS.

Fig. 5. DFRS at different scattering distances.

Fig. 6. DFRS measurement system.

Fig. 7. Intensity probability distributions of Gaussian speckle, experimentally measured speckle, and DFRSs, which are generated on surfaces with a roughness of 0.3 µm at different scattering distances.

Fig. 8. (a) and (c) are random surface height fluctuations with roughness of 0.2 µm and 0.3 µm, respectively. (b) and (d) are the speckle intensity distribution at z=λ/2 and z=3λ/5.