Fig. 1. Off-line test diagram of alumina scattering sphere

Fig. 2. Relation between scattering efficiency and angle θ of incident light and collection cone

Fig. 3. Relation between scattering efficiency and distance

Fig. 4. Track data of the scattered light. (a) Track data of the scattered light received by the photomultiplier before adding a 351 nm bandpass filter; (b) track data of the scattered light received by the photomultiplier after adding a 351 nm bandpass filter

Fig. 5. Schematic diagram of time synchronization test using scattering sphere

Fig. 6. Online synchronous test experiment schematic diagram of Shenguang-II facility

Fig. 7. Track data of the first infrared reference light and ultraviolet signal light obtained by the oscilloscope

Fig. 8. Fitting results. (a)The blue asterisk are the points selected by the infrared reference light higher than the oscilloscope reading noise, and the red curve is the result of its fitting; (b) the blue asterisk are the points above the oscilloscope reading noise selected by the ultraviolet signal light, and the red curve is the result of its fitting

Fig. 9. Test results of eight pulses of delay between the first signal light to be measured and the reference light

Fig. 10. Final time synchronization test results of the four-way signal beam and the reference beam

Fig. 11. Off-line scattering sphere and oscilloscope dual-channel jitter test optical path diagram

Fig. 12. The relationship between the infrared scattering efficiency and the angle θ of the incident light and the collection cone measured by off-line scattering sphere

Fig. 13. Track data of jitter between the test beams under dual-channel when the scattering sphere was used

Fig. 14. Off-line non-scattering sphere using oscilloscope dual-channel jitter test optical path diagram