A wide-band dual-field optical system working at 1-5μm is designed. The freeform off-axis three-mirror optical structure is adopted for the narrow field design with adding a plane mirror to fold the optical path. The focal length is 600mm, the f-number is 6, and the field of view is 2.34°×2.34°. The wide field is designed with a lens group, where the focal length is 17.3mm, the f-number is 2, and the diagonal field of view is 30°. In terms of arrangement, a hole is dug in the center of the primary mirror of the off-axis three-mirror system as the clear aperture of the lens group, so as to realize simultaneous imaging of the same target through both optical paths.
Exit pupil expansion for retinal scanning displays (RSDs) is studied in this paper. Different exit pupil expanders (EPEs) are introduced, and exit pupil expansion utilizing a single microlens array (SMLA) together with a collimating lens is proposed after analysis and simulation. Experiments with different EPEs are conducted to show the feasibility of the proposed configuration.
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