Optical surfaces with inherent rough finish may scatter light in-field in modern instruments and detection systems. This results in the deterioration of the signal-to-noise ratio and the introduction of spurious or ghost images. We present computations of the rms surface height, using the surface height power spectrum to validate the qualities of measured BRDF tests. We compare it with (scalar and vector) scattering theories. Furthermore, we provide a numerical calculation in support of a novel concept of measuring a small angle scattering. Finally, a novel concept of small angle scattering measurement with a non-diffraction beam is also proposed.
Strojnik et al. (Wed,) studied this question.
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