Fig. 1. System layout of differential two-wave mixing interferometer

Fig. 2. Schematic diagram of two-wave mixing interference in photorefractive crystal

Fig. 3. Schematic diagram of differential dual-path signal

Fig. 4. Influence of voltage applied to BSO crystal on phase shift in simulation

Fig. 5. Time domain diagram of dual-path differential output signal in simulation

Fig. 6. Relationship between differential output signal and measured vibration amplitude

Fig. 7. Measurement result of vibration with noise in simulation

Fig. 8. Comparison of measurement results for sinusoidal vibration of 2 kHz in experiment

Fig. 9. Spectrum analysis of measurement results for sinusoidal vibration with 2 kHz in experiment

Fig. 10. Measurement result of sinusoidal vibration with 200 kHz in experiment

Fig. 11. Relationship between differential output voltage and measured vibration amplitude in experiment

Fig. 12. Measurement stability test results