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- W2023632344 abstract "The surface of an initially planar membrane, which is subsequently subjected to a pressure difference, can be manipulated into a variety of shapes. This report discusses two methods by which optically desirable deterministic shapes might be achieved. The first involves pre-straining of the membrane, a technique which has already been demonstrated to reduce the spherical aberration in such a mirror. However, near-parabolic shapes at low f-numbers appear not to be achievable with this method, i.e., using pressure differences and pre-strain alone. The second technique is a somewhat novel one involving the use of a plunger to translate the central region of the membrane along the optical axis. Preliminary results suggest that attainment of a near-parabolic shape over a substantial area of the membrane may indeed be possible with this method. The experiments described here use an aluminum coated 125 micron thick polyimide membrane with a clear aperture of 11 inches." @default.
- W2023632344 created "2016-06-24" @default.
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- W2023632344 date "1999-11-03" @default.
- W2023632344 modified "2023-09-23" @default.
- W2023632344 title "<title>Concave membrane mirrors from aspheric to near-parabolic</title>" @default.
- W2023632344 doi "https://doi.org/10.1117/12.367593" @default.
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