Fig. 1. Physical process diagram of optical-atomic magnetometer

Fig. 2. Structural diagram of magnetometer system

Fig. 3. Diagram of electron spin optical pump. σ⁺ represents left circularly polarized light^[10]

Fig. 4. Step diagram of glass blowing method, and physical drawing of atomic vapor cell^[40]. (a) Step diagram of glass blowing method; (b) physical drawing of atomic vapor cell. The black arrow indicates 1 mm

Fig. 5. Flow chart of atomic vapor cell fabrication based on MEMS^[45]

Fig. 6. Top view of atomic vapor cell and physical drawing of atomic vapor cell^[47]. (a) Top view of atomic vapor cell; (b) physical drawing of atomic vapor cell

Fig. 7. Flow chart of alkali metal direct filling method^[49]

Fig. 8. Flow chart of atomic vapor cell fabrication by chemical reaction method^[51]

Fig. 9. Miniature atomic vapor cell before (left) and after (right) UV decomposition^[55]

Fig. 10. Relationship between ultra-fine linewidth and buffer gas pressure^[39]

Fig. 11. Relationship between number density of alkali metal atoms and temperature

Fig. 12. Optical detection schemes. (a) Absorption detection^[69]; (b) phase-shifting detection^[70]

Fig. 13. Physical drawing and schematic diagram of sensor head^[63]. (a) Physical drawing of sensor head; (b) schematic diagram

Fig. 14. Evolution of miniature sensor head proposed by NIST^[26]

Fig. 15. Miniature optical pump atomic magnetometer proposed by Chinese Academy of Sciences^[98]