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Ultrathin four-reflection imager

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Abstract

We present the design and experimental demonstration of an ultrathin four-reflection imager. The F/1.15 prototype imager achieves a focal length of 18.6mm in a track length of just 5.5mm, providing a 17° field of view over 1.92 megapixels of a color image sensor with 3μm pixels. We also present the design and experimental results of pupil-phase encoding and postprocessing, which were applied to extend the depth of field and compensate a small amount of axial chromatic aberration present in the four-reflection imager prototype.

© 2009 Optical Society of America

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