Fig. 1. Schematic diagram of Doppler asymmetric spatial heterodyne interferometer

Fig. 2. Grating notch pattern of interferogram

Fig. 3. Schematic diagram and actual object of the phase stability experiment of the Doppler asymmetric spatial heterodyne interferometer

Fig. 4. Interferogram data of argon lamp. (a) Original interferogram; (b) baseline-removed fringe of row 1024

Fig. 5. Temperature condition of experiment. (a) Ambient temperature; (b) temperature of interferometer element

Fig. 6. Variation of phase slope with time

Fig. 7. Variation of phase intercept with time

Fig. 8. Variation of interferogram phase shift with time

Fig. 9. Comparison of interferogram phase shift and ambient temperature

Fig. 10. Variation of interferometer asymmetric phase shift with time

Fig. 11. Variations of temperature and asymmetric phase shift of interferometer with time in non-steady state. (a) Temperature of interferometer; (b) asymmetric phase shift of interferometer

Fig. 12. Relationship between temperature and asymmetric phase shift of interferometer in non-steady state