Fig. 1. Schematic diagram of lidar system structure with small-field of view and high-repetition frequency

Fig. 2. Light path diagram of optical-mechanical system of the transmitting unit

Fig. 3. Relation curve between incident angle and divergence angle after beam expansion

Fig. 4. Optical-mechanical structure of transmitting unit

Fig. 5. Light path diagram of optical-mechanical system of the receiving and aft-optical unit

Fig. 6. Light spot on the target surface of the detector under the field of view of 0.14 mrad (half angle)

Fig. 7. Diffuse spots (a) and energy concentration (b) of telescope system under the field of view of 0.14 mrad (half angle)

Fig. 8. Eccentricity(a) and radius(b) of diffuse spot of the telescope system under different fields of view

Fig. 9. Optical-mechanical structure of the receiving and aft optical unit

Fig. 10. Lidar effective payload with small-field of view and high-repetition frequency

Fig. 11. Adjustment of optical-mechanical structure (a) and detection optical path of divergence angle (b) in transmitting unit

Fig. 12. Detection (a) and results (b) of the wave aberration of telescope system

Fig. 13. Adjustment of optical-mechanical structure of receiving and aft optical units

Fig. 14. Original signal detected at 23:13 on October 11, 2020

Fig. 15. Ratio of echo signal of S channel and P channel

Fig. 16. Profile of extinction coefficient (a) and depolarization ratio (b) detected at 12:00 on November detected at 00:24 on October 12, 2020

Fig. 17. Profile of extinction coefficient (a) and depolarization ratio (b) detected at 12:00 on November 04, 2020