Fig. 1. Schematic of division of primary diffraction mirror in different directions. (a) Meridian direction; (b) sagittal direction

Fig. 2. 2D Yee meshing method

Fig. 3. Flow chart of proposed method

Fig. 4. Structural diagram of diffractive optical system

Fig. 5. MTF curves of 0° field of view

Fig. 6. MTF analysis results at different wavelengths and fields of view. (a) 0.49 μm, 0°; (b) 0.47 μm, 0°; (c) 0.5 μm, 0.1°; (d) 0.5 μm, 0.2°

Fig. 7. Comparison of calculation speed before and after using fast solution method