Fig. 1. Structural diagram of acousto-optic modulator

Fig. 2. Bragg acousto-optic diffraction pattern

Fig. 3. Relationship between diffraction efficiency and ultrasonic power

Fig. 4. Optical path for measuring diffraction efficiency of acousto-optic modulator

Fig. 5. Optical path for enhancing diffraction efficiency of acousto-optic modulator by using positive feedback

Fig. 6. Experimental apparatus for measuring polarization retention

Fig. 7. System's stability monitoring diagram