Fig. 1. Overall configurations of high-finesse F-P optical micro-cavity and C- QED. (a) Super-mirror test and ultra-stable micro-cavity system^[63]; (b) micro-cavity high-precision control system based on frequency chain; (c) atom-micro-cavity strong coupling system

Fig. 2. Principle diagram of cavity mirror loss measurement using cavity ring-down technology

Fig. 3. Schematic of cavity parameters for bidirectional transition-reflection measurement^[63]

Fig. 4. Structural diagram of frequency chain system

Fig. 5. Schematic of preparation and transport of cold atoms as well as their coupling with optical micro-cavity

Fig. 6. Realization and measurement of strongly coupled interaction for C-QED system^[67]

Fig. 7. Top view of sectional structure of high-finesse optical micro-cavity used for C-QED experiment

Fig. 8. Cavity transmission spectra of single atom as well as single atom coupling with high-order modes of high-finesse optical micro-cavity^[64,69]. (a) TEM₁₀ mode; (b) TEM₂₀ mode; (c) TEM₃₀ mode

Fig. 9. Optical non-reciprocal effect based on C-QED system^[67]. (a) Optical bistablility occurring in asymmetric strongly coupled C-QED system under different light transmission directions, in which shaded part is nonlinear optical non-reciprocal window; (b) transmission efficiency of forward transmitted light and blocking efficiency of backward light under different atom numbers