Figure 5
(a) Relationship between the co-magnetometer response and the pumping power density. The co-magnetometer response is modelled to be K1. The optimized power density is 1.3 V, and the co-magnetometer response is largest. Although the responses at very small power densities are larger than that at 1.3 V, these power densities are not appropriate, as the 21Ne polarization is too small to suppress the magnetic field. (b) The measured Rb polarization at various power densities. The Rb polarization is calculated using the pumping rate and the total relaxation rate. Both rates are measured in Fig. 4(b). As the pumping laser power density is approximately 1.3 V, the Rb polarization is approximately 50%. Simultaneously, the co-magnetometer response is largest.
