Mid-Range Spatial Frequency Errors in Optical Components.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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This research effort isolates a spatial frequency range of surface errors of approximately two orders of magnitude neglected in standard optical component specification and testing. The frequency range is bounded on the low end by the Zernike Polynomial representation of the surface error function and the high end by root mean square surface roughness characterization. These mid-range spatial frequencies are analyzed using a geometric optics approach which predicts an out-of-focus intensity pattern containing information directly related to the curvature errors present in the surface of the optical component. The geometrical predictions provide the basis for a proposed experimental technique for examining the mid-range spatial frequency errors present in an optical component. The anticipated results and observable errors using this technique are presented for an example component and a discussion of extending this technique to other components is included. Author
- Optical Detection and Detectors