Experimental study of the CPT magnetometer worked on atomic energy level modulation

We have set up a coherent population trapping (CPT)-based atomic magnetometer experimental system worked with ⁸⁷Rb atoms, and with this system experimentally investigated the behaviour of a CPT magnetometer prototype proposed by us, which worked with the atomic energy level modulation scheme. Through systematical comparison with generally used microwave frequency modulation scheme, the experimental results reveal that the energy level modulation scheme not only extends the detection range, but also improves the sensitivity of magnetic field detection.