Fig. 1. Schematic of beam-splitting amplitude holographic exposure system

Fig. 2. Schematic diagram of inter-beam angle variations with different beam-splitting devices

Fig. 3. Relationship between directional requirements and grating size

Fig. 4. Actual optical path for ray-tracing numerical analysis

Fig. 5. Interference fringe variations derived from ray-tracing with different beam-splitting devices

Fig. 6. Light path expansion with grating splitting

Fig. 7. Variation of phase of detection point with angle of incident light for grating splitting

Fig. 8. Block diagram of phase locking system

Fig. 9. Photograph of controller hardware

Fig. 10. Software architecture of phase-locked system

Fig. 11. Results of phase locking experiment

Fig. 12. Spectrum comparison before and after locking