Fig. 1. Principle of seed injection

Fig. 2. Measured frequency drift diagram of the main laser

Fig. 3. Picture of "water bath" temperature control box

Fig. 4. Effect of temperature change on laser frequency

Fig. 5. Frequency shift of the laser after adding temperature control

Fig. 6. Experimental device diagram of frequency stabilization system

Fig. 7. 1111 absorption line of iodine molecules at 70 ℃

Fig. 8. Picture of frequency stabilization system

Fig. 9. Relationship between PZT voltage of seed laser and laser frequency

Fig. 10. Frequency stabilization within 4 h

Fig. 11. Result of using frequency lock technology for 4 h

Fig. 12. Four consecutive observations results of radial wind velocity in the same direction