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Opt."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:p>Imaging detectors under intense light suffer from local saturation and reduced visibility. We propose a co-design methodology for active front-end interference suppression. This framework formulates the coupled physical constraints of beam separation, conjugate transfer, and non-rotationally symmetric aberration correction inherent to tilted modulation planes. By integrating digital micromirror device (DMD) spatial modulation with a two-stage off-axis freeform four-mirror architecture, we reveal the joint governing mechanisms of local masking, plane orientation, and aberration correction. Simulations over 0.35\u20131.0\u00a0\u00b5m yield a full-field MTF above 0.725 at 50\u00a0lp\/mm and a maximum distortion of 2.29%. Independent validation of the second-order DMD-to-detector mapping yields residuals of 0.407\u00a0\u00b5m RMS and 0.763\u00a0\u00b5m maximum. 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