Fig. 1. Schematic diagram of AOM and optical phase-locked loop system

Fig. 2. Frequency stabilization system based on acousto-optic modulators and optical phase-locked loops

Fig. 3. Double-pass optical path of AOM

Fig. 4. The relationship between driving frequency and input voltage of AOM

Fig. 5. Optical phase-locked loop model

Fig. 6. The relationship between diffraction efficiency and driving voltage

Fig. 7. The relationship between signal to noise ratio of beat frequency signal and driving voltage

Fig. 8. The relationship between beat frequency standard deviation and PI control circuit parameters

Fig. 9. (a) Beat frequency spectrum before loop locking; (b) Beat frequency spectrum after loop locking; (c) Beat frequency signal expansion diagram; (d) AOM drive frequency map when the loop is not locked; (e) AOM drive frequency map during loop locking; (f) AOM drive frequency expansion diagram when the loop is not locked

Fig. 10. Fluctuating beat frequency after free operation and locking

Fig. 11. Comparison diagram of Allen variance of optical phase-locked loop system and reference signal