Fig. 1. Schematic diagram of phase shift caused by gravity during atomic interference

Fig. 2. Configuration of the horizontal-type atom gravity gradiometer

Fig. 3. Spatial structure and working process of the horizontal-type atom gravity gradiometer

Fig. 4. Constitution of the compact horizontal-type atom gravity gradiometer

Fig. 5. Internal structure of the sensor of the compact horizontal-type atom gravity gradiometer

Fig. 6. Energy levels of ⁸⁵Rb D₂ transition and various laser frequencies required for atom interference^[14]

Fig. 7. Schematic diagram of optical unit of horizontal-type atom gravity gradiometer

Fig. 8. Schematic diagram of the electronic control unit

Fig. 9. Photograph of compact horizontal-type atom gravity gradiometer

Fig. 10. Differential ellipses under different orientations of k_eff of Raman light

Fig. 11. Allan deviation curve of gravity gradient measurement

Fig. 12. Experimental results of gravity field modulation