Fig. 1. Schematics of atomic energy level and experimental setup. (a) Energy level diagram of ¹³³Cs atom in four-wave mixing process; (b) schematic diagram of experimental setup

Fig. 2. The curve of blue light power versus the power of the two pumping lasers. (a) Two blue light powers versus 852 nm pump optical power; (b) two blue light powers versus 921 nm pump optical power

Fig. 3. Blue light intensity versus frequency detuning. (a)(b) 3D images;(c)(d) 2D images

Fig. 4. Power of blue light versus temperature