Fig. 1. Schematic diagram of 4f system

Fig. 2. Schematic diagram of SAR optical processor

Fig. 3. Structure diagram and image quality evaluation diagram of Fourier transform lens. (a) Structure chart; (b) Spot diagram; (c) MTF figure; (d) Wavefront figure

Fig. 4. Optical system structure diagram and image quality evaluation diagram. (a) Structure chart; (b) MTF chart

Fig. 5. Structure of Fourier transform. (a) 2f lens group in the front; (b) 2f lens group in the back

Fig. 6. Structural diagram of flexible lens base

Fig. 7. Cloud diagram of front 2f lens group deformation. (a) X direction; (b) Y direction; (c) Z direction

Fig. 8. System structure of 4f optical processor

Fig. 9. First two modal cloud images of the whole structure. (a) First modal cloud image; (b) Second modal cloud image

Fig. 10. 4f system device diagram and simulation result diagram. (a) Device diagram; (b) Simulation result diagram