Fig. 1. The structure of the AOM.

Fig. 2. (a) Rectangular superimposed and normalized sound field distribution; (b) distribution of the acoustical field along the z axis.

Fig. 3. (a) Schematic diagram for analyzing the direction of sound waves using the spectrum; (b) Fourier transform of a rectangular electrode; (c) Fourier transform of a diamond electrode; (d) Fourier transform of a Gaussian electrode.

Fig. 4. (a) Acousto-optical interaction length of the diamond electrode; (b) acousto-optical interaction length of the Gaussian electrode.

Fig. 5. (a) Simulation size of serrated periodic electrode (in mm); (b) Fourier transform of the serrated periodic electrode.

Fig. 6. Acousto-optical interaction length of the serrated periodic electrode.

Fig. 7. (a) Phase distribution at sawtooth period electrode (inner width 0.5 mm); (b) phase distribution at sawtooth period electrode (inner width 0.8 mm); (c) phase distribution at sawtooth period electrode (inner width 1.3 mm); (d) phase distribution at rectangular electrode.

Fig. 8. (a) Amplitude distribution of rectangular electrode; (b) serrated periodic electrode (inner width: 1.3 mm); (c) serrated periodic electrode (inner width: 0.8 mm); (d) serrated periodic electrode (inner width: 0.5 mm).

Fig. 9. Typical AOM configuration with serrated periodic electrode.

Fig. 10. Five-dimensional controllable motor scanning test platform.

Fig. 11. Serrated periodic electrodes with different inner widths.

Fig. 12. Diffraction efficiency curves of serrated and rectangular electrodes.

Fig. 13. (a) Acoustic field distribution inside an acousto-optical crystal with rectangular electrode; (b) acoustic field distribution inside an acousto-optical crystal with serrated periodic electrode (inner width: 0.5 mm).

Fig. 14. Incident position of the light beam.

Fig. 15. Diffracted light efficiency curves under different incident positions of the beam.

Fig. 16. 3 dB efficiency bandwidth curves for different electrodes.