Fig. 1. Schematic diagram of snapshot interference imaging spectrometer

Fig. 2. Sketch map of step surface shape error of multi micro mirror unit. (a) Concave deformation of step element; (b) convex deformation of step element

Fig. 3. Intensity of interference image point array corresponding to different step surface shape error. (a) No surface shape error; (b) low order distribution; (c) high order distribution; (d) simultaneous distribution of low order and high order

Fig. 4. Recovered spectra corresponding to different step surface shape error distributions. (a) No surface shape error; (b) low order distribution; (c) high order distribution; (d) simultaneous distribution of low order and high order

Fig. 5. Phase error corresponding to different step surface shape error varying with optical path difference. (a) No surface shape error; (b) low order distribution; (c) high order distribution; (d) simultaneous distribution of low order and high order

Fig. 6. Strehl ratio modulation curves of coherent image points from two ways

Fig. 7. Corresponding relationship between spatial position and imaging field of view on multi micro mirrors

Fig. 8. Phase error corresponding to different step surface error distribution varying with field of view and azimuth angle. (a) Low order distribution; (b) high order distribution; (c) simultaneous distribution of low order and high order

Fig. 9. Relationship between reconstructed spectrum error and step sagittal height of two multi micro mirrors