Fig. 1. (a) Schematic diagram of double-pass AOM based on circulator and reflector mirror; (b) Schematic diagram of double-pass AOM based on PBS and Faraday mirror; (c) Output pulse shape between two different methods

Fig. 2. (a) Experimental setup of double-pass fiber amplification in CW mode; (b) Comparison on laser slope efficiency between double-pass and single-pass amplification; (c) Comparison on laser small signal gain between double-pass and single-pass amplification

Fig. 3. (a) The schematic of pulse laser source for wind lidar based on single AOM and single-stage double pass method; (b) Slope efficiency of the pulsed laser source; (c) SMSR and (d) pulse waveform of the output laser；(e) The output average power stability curve for 3 hours

Fig. 4. (a) Schematic diagram of wind lidar based on single-stage fiber amplifier； (b) Picture of pulsed coherent wind lidar

Fig. 5. The measured noise floor of test wind lidar and RIO seed laser

Fig. 6. Correlation plots between test wind lidar and calibrated wind lidar at (a) 100 m, (b) 160 m and (c) 200 m