Fig. 1. Schematic diagram of high power laser system and modulated laser phase discrimination method

Fig. 2. Schematic diagram of phase method to measure the delay time difference

Fig. 3. Variation of time delay measurement error with phase difference in one period. (a) Interval [-10°,10°]; (b) interval [80°,100°]; (c) interval [170°,190°]; (d) interval [260°,280°]; (e) one period

Fig. 4. Schematic diagram of phase shift differential measurement

Fig. 5. Design scheme of the photoelectric phase measurement module

Fig. 6. Voltage-delay theoretical simulation and experimental measurement results. (a)(c) Theoretical simulation; (b)(d) scatter plot of experimental results

Fig. 7. Experimental measurement error. (a)(c) Voltage measurement error; (b)(d) time delay measurement error