Design of optical system based on DMD for simulator with large field of view and long exit pupil distance

In order to meet the requirements of the high dynamic star simulator, a set of projection optical system and illumination optical system suitable for digital micromirror device (DMD) was designed. The secondary imaging method was adopted by the projection optical system, which solved the problem that it was difficult to achieve long working distance and system aberrations alignment in the case of large field of view and long exit pupil distance. The compound eye lens array was used to design the corresponding illumination optical system, and the approximately coaxial arrangement of the illumination system and projection system was realized by using a total reflection prism. The design results show that the optical system has a 60 mm exit pupil distance and a 28.6° field of view, the distortion is less than 0.045% and the 80% of the energy is concentrated in the circle with a diameter of 8 μm, the illumination uniformity of the illumination system is greater than 94%, which meet the design index requirements, and is suitable for the optical system of DMD dynamic star simulator with large field of view and long exit pupil distance.