Fig. 1. Structural diagram of piezoelectric ceramic optical liquid phase modulator

Fig. 2. Physical picture of phase modulator

Fig. 3. Optical path diagram of interference phase detection system

Fig. 4. Selected reference line

Fig. 5. Gray value versus relative position of fringe

Fig. 6. Gray values under different driving voltages

Fig. 7. Gray value versus voltage. (a) Voltages are 1.0 V and 8.0 V; (b) voltages are 8.0 V and 15.0 V

Fig. 8. Fringe gray values under different applied voltages

Fig. 9. Optical path versus voltage.(a) Voltage is 0－28.0 V; (b) voltage is 3.0－4.0 V

Fig. 10. Time response curve of phase modulator at driving voltage of 25.0 V