Design of large field of view diffractive lens based on quadratic phase profile

In this paper, combined with the idea of phase optimization and computational imaging, an optimization design method of diffraction microstructure of large field of view diffractive lens is studied. The off-axis aberration of the diffractive lens is regulated, and the back-end image restoration algorithm is combined to finally achieve a large field of view and high-quality imaging effect. Based on the quadratic phase profile, the microstructure height of the diffractive lens is numerically optimized. A quadratic phase diffractive lens with an aperture of 500 μm and a focal length of 500 μm is designed, fabricated and experimentally verified. Finally, it is proved that this method can achieve 60° (±30°) large field of view diffraction imaging effect.