Fig. 1. Related energy level and schematic diagram of ¹³³Cs atom 6S_1/2→6P_3/2 hyperfine transitions. (a) Principle of circular induced-dichroism atomic optical filter; (b) principle of Faraday anomalous dispersion optical filter

Fig. 2. Experimental setup diagram of nonlinear optical filter

Fig. 3. Typical signals for nonlinear optical filter. (a) Transmission spectrum of ¹³³Cs atom with 6S_1/2(F=4)→6P_3/2(F'=3,4,5) transitions; (b) transmission spectrum of ¹³³Cs atom with 6S_1/2(F=3)→6P_3/2(F'=2,3,4) transitions

Fig. 4. Peak transmission and bandwidth of nonlinear optical filter vary with power of 852 nm circularly polarized pump laser. (a) ¹³³Cs 6S_1/2(F=4)→6P_3/2(F'=4, F'=5) crossover transition; (b) ¹³³Cs 6S_1/2(F=3)→6P_3/2(F'=2, F'=4) crossover transition

Fig. 5. Peak transmission and bandwidth of nonlinear optical filter vary with temperature of ¹³³Cs vapor cell. (a) ¹³³Cs 6S_1/2(F=4)→6P_3/2(F'=4, F'=5) crossover transition; (b) ¹³³Cs 6S_1/2(F=3)→6P_3/2(F'=2, F'=4) crossover transition

Fig. 6. Peak transmission and bandwidth of nonlinear optical filter vary with axial magnetic field. (a) ¹³³Cs 6S_1/2(F=4)→6P_3/2(F'=4, F'=5) crossover transition; (b) ¹³³Cs 6S_1/2(F=3)→6P_3/2(F'=2, F'=4) crossover transition

Fig. 7. Peak transmission and bandwidth of nonlinear optical filter vary with the power of 852 nm signal laser. (a) ¹³³Cs 6S_1/2(F=4)→6P_3/2(F'=4, F'=5) crossover transition; (b) ¹³³Cs 6S_1/2(F=3)→6P_3/2(F'=2, F'=4) crossover transition