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Conformal domes are often deviated greatly from spherical surface descriptions, so severe aberrations which vary with
the field-of-regard (FOR) angle are introduced by the domes. Therefore dynamic correction is required. Two
counterrotating Risley prisms and two lenses are used to correct the dynamic aberrations. The inner surfaces of the
counterrotating prisms and the two lenses are described by Zernike Fringe polynomials. The scan of the field of regard is
achieved by counterrotating the Risley prisms about the optical axis. The performance after correction in terms of
Zernike aberrations and RMS spot size versus FOR angle is reported by an example. For comparison, the RMS spot
radius is reduced to 16-68 &mgr;m after the final correction, which is approximately 0.8-4.5 times Ariy spot radius, which is
much better than the 30.2-69.1 times in the baseline system. The design results show that the counterrotating wedges and
the two lenses which both have Zernike fringe sag inner surfaces are good correctors in conformal optical design.
Yan Li,Lin Li, andYifan Huang
"Conformal optical design using counterrotating wedges and Zernike Fringe Sag surfaces", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713340 (12 January 2009); https://doi.org/10.1117/12.807533
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Yan Li, Lin Li, Yifan Huang, "Conformal optical design using counterrotating wedges and Zernike Fringe Sag surfaces," Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713340 (12 January 2009); https://doi.org/10.1117/12.807533