15 January 1976 Evaluation Of Low-Scatter Technology For Aspheric Metal Mirrors
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An evaluation of the off-specular scatter from a metal mirror is required for those radiometric systems where high off-axis rejection is achieved through low-scatter primary optics. This paper addresses the testing procedures for determination of the bi-directional reflectance distribution function (BRDF) at 10.64m, handling techniques for the prevention of degraded mirror performance through contamination, and the low-scatter performance achieved by the current fabrication technology for large, aspheric samples. The statistics of mirror surface sampling is also presented, as well as the distribution of the resultant measurements for a significant sampling of the surface area. The latter are used to demonstrate the impact that various types of surface imperfections have on low-scatter performance, as well as indicate typical behavior for the better low-scatter mirrors. These statistics also indicate the best performance that can be anticipated under the present technology once these imperfections are eliminated.
© (1976) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael E. Curcio "Evaluation Of Low-Scatter Technology For Aspheric Metal Mirrors", Proc. SPIE 0065, Design, Manufacture and Application of Metal Optics, (15 January 1976); doi: 10.1117/12.954514; https://doi.org/10.1117/12.954514


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