The art of specifying optics for scatter

John C. Stover

doi:10.1117/12.693206

7 September 2006 The art of specifying optics for scatter

John C. Stover

Proceedings Volume 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II; 62910O (2006) https://doi.org/10.1117/12.693206
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Light scatter is a bothersome source of noise in many optical systems. As one example, this is particularly true for telescopes and weapons systems where imaging, tracking and identifying relatively weak signals in the presence of much stronger light sources is critical. As a general rule optical components are not specified for scatter. Instead, almost across the optics industry roughness specifications are routinely (and inadequately) substituted. Issues include: misuse (or ignoring) spatial frequency bandwidths for roughness specifications, using one dimensional roughness statistics for two dimensional applications, ignoring profilometer high frequency roll off (where a lot of scatter is generated) and ignoring the effects surface coatings have on scatter. As an example most roughness measurements extend only to spatial frequencies of about 0.1 μm^-1, which corresponds to visible scatter only about five degrees from the reflected specular beam. Scatter into the rest of the hemisphere is ignored. The problems are not easy. Measuring every optic for scatter at the wavelengths of use, for example, is not a reasonable solution. This paper reviews the relevant technical issues and indicates a cost effective solution that will drop optical noise floors if implemented by both government contractors and their vendors.

Citation Download Citation

John C. Stover "The art of specifying optics for scatter", Proc. SPIE 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II, 62910O (7 September 2006); https://doi.org/10.1117/12.693206

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KEYWORDS

Bidirectional reflectance transmission function

Profilometers

Spatial frequencies

Scatter measurement

Reflectors

Light scattering

Mirrors

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